1 00:00:00,960 --> 00:00:06,240 Hello Girl scouts and troop leaders! We at GLOBE  are very excited that you have chosen to use the   2 00:00:06,240 --> 00:00:11,360 GLOBE Observer app to work on your Think Like a  Citizen Scientist Journey. This video can be used   3 00:00:11,360 --> 00:00:16,320 as a plug-and-play with pauses for activities, so  pay attention and pause the video while you work.   4 00:00:17,040 --> 00:00:22,080 Alternatively, troop leaders, service unit,  or council volunteers can use this video   5 00:00:22,080 --> 00:00:27,120 as an example of how you might run your own  program. However you choose to use this video,   6 00:00:27,120 --> 00:00:30,560 enjoy your journey as you learn  to think like a citizen scientist. 7 00:00:32,480 --> 00:00:36,960 Welcome to the first step in being a critical  part of a growing citizen science project.   8 00:00:36,960 --> 00:00:40,960 Today you will learn about what it means to  think like a citizen scientist, learn about   9 00:00:40,960 --> 00:00:47,360 the Trees tool on the GLOBE Observer app, and make  your own paper clinometer. But first let me tell   10 00:00:47,360 --> 00:00:52,640 you about GLOBE and GLOBE Observer. GLOBE is an  international science and education program that   11 00:00:52,640 --> 00:00:57,760 provides students and the public worldwide with  the opportunity to participate in data collection   12 00:00:57,760 --> 00:01:02,560 and the scientific process and contribute  meaningfully to our understanding of the Earth   13 00:01:02,560 --> 00:01:08,480 system and global environment. GLOBE Observer  is an app that is a data entry tool that allows   14 00:01:08,480 --> 00:01:14,080 citizen scientists to enter their data and share  observations. GLOBE Observer is part of GLOBE.   15 00:01:15,280 --> 00:01:19,600 OK, speaking of the Think Like a Citizen  Scientist Journey, learning about what it   16 00:01:19,600 --> 00:01:25,120 means to observe is the first step in thinking  like a citizen scientist. Let's get started by   17 00:01:25,120 --> 00:01:32,400 practicing our observation skills. When we observe  we use our senses: taste, smell, touch, hearing,   18 00:01:32,400 --> 00:01:37,840 and sight. Since we can't really taste, smell,  hear, or touch these pictures, we are going to   19 00:01:37,840 --> 00:01:43,920 use our sense of sight. Here are pictures of  a tree to observe from a distance and then   20 00:01:43,920 --> 00:01:50,240 up close. Here are some possible questions that  you could use to help with your observations.   21 00:01:50,880 --> 00:01:56,160 Do trees have needles or leaves? When do you think  this image was taken? How tall do you think that   22 00:01:56,160 --> 00:02:01,440 tree is? What did you notice about your tree?  Was there anything different about looking at   23 00:02:01,440 --> 00:02:07,280 your tree from a distance or then zoomed in? Did  you see any colors or patterns, or any insects,   24 00:02:07,280 --> 00:02:12,400 plants, animals, lichen, or fungi on your tree?  What do you think makes this tree special?   25 00:02:13,440 --> 00:02:17,360 You can write down any observations you  made in the chat, your science journal,   26 00:02:17,360 --> 00:02:22,720 or on a piece of paper. If you can, you can do  the same activity with any tree, not just with   27 00:02:22,720 --> 00:02:27,600 the photographs. This could be a great activity  for a nature walk, hike, playground meeting or   28 00:02:27,600 --> 00:02:32,800 even something to do in your own yard, so don't  feel limited to just take these pictures. Leaders,   29 00:02:32,800 --> 00:02:37,360 once your Girl Scouts have finished noting their  observations, ask them to share. I'm going to   30 00:02:37,360 --> 00:02:42,880 ask your leaders to pause the video so you have  time to finish your observations and discuss. 31 00:02:48,480 --> 00:02:53,680 Welcome back! I bet you made some really great  observations. Some things I noted about this   32 00:02:53,680 --> 00:02:58,000 tree is that the photo was taken when the  leaves had fallen from the tree, either fall,   33 00:02:58,000 --> 00:03:04,640 spring or winter. The tree is deciduous and not an  evergreen because it lost all its leaves. The tree   34 00:03:04,640 --> 00:03:10,320 provides habitat for lichen and moss. The tree's  in a park near a playground and soccer field,   35 00:03:11,280 --> 00:03:16,480 and the tree is moderately tall, but not as tall  as some of the evergreens in the background.   36 00:03:17,600 --> 00:03:23,600 Observations can tell us a lot about something,  and scientists use observations in their work.   37 00:03:24,800 --> 00:03:26,720 What do scientists do? 38 00:03:29,600 --> 00:03:34,640 Pause the video and discuss with  your troop what a scientist does .  39 00:03:36,240 --> 00:03:39,520 I bet you had a great discussion  on what it means to be a scientist. 40 00:03:40,080 --> 00:03:45,040 There are lots of different types of scientists  out there, but one thing they all have in common   41 00:03:45,040 --> 00:03:51,520 in their research is that scientists rely on  the scientific method to learn new things. You   42 00:03:51,520 --> 00:03:57,280 are going to be citizen scientists, where you  use the scientific method to help gather data   43 00:03:57,280 --> 00:04:02,800 for NASA scientists and other researchers  including students or scouts just like you. 44 00:04:05,200 --> 00:04:10,320 The first part of the scientific method is to  observe. You all did a great job of observing the   45 00:04:10,320 --> 00:04:16,320 tree pictures. You can do that with any tree and  if you do it in person, you can touch and smell   46 00:04:16,320 --> 00:04:23,360 the tree as long as it's safe to do so. Just be  aware of poison oak or poison ivy. The next part   47 00:04:23,360 --> 00:04:29,840 of the scientific method is to create a question  and make a hypothesis. A hypothesis is just a   48 00:04:29,840 --> 00:04:35,680 fancy word for your best guess at the answer  to your question based on your observations. 49 00:04:37,680 --> 00:04:41,280 Let's make some observations about these two trees   50 00:04:41,280 --> 00:04:44,640 and then form a question  based on those observations.   51 00:04:46,080 --> 00:04:50,720 So let's make some observations. What  differences do you notice between these trees? 52 00:04:51,840 --> 00:04:55,840 Any similarities? What do you want to know?   53 00:04:56,400 --> 00:04:59,360 What is your question that  you're going to try and answer? 54 00:05:01,520 --> 00:05:04,560 Pause the video and discuss.  You can come up  with your 55 00:05:04,560 --> 00:05:10,240 own questions or you can use  the one that I'll provide next. 56 00:05:10,240 --> 00:05:14,080 Our question could be, "can tree  height tell you which tree is older?" 57 00:05:16,160 --> 00:05:22,400 The hypothesis is your answer to that question. So let's make a hypothesis. We have a few options,   58 00:05:23,280 --> 00:05:26,880 yes or no. What do you think? 59 00:05:29,200 --> 00:05:32,880 Leaders, please pause the video while  you discuss this with your group. 60 00:05:36,240 --> 00:05:42,960 I chose the hypothesis of, "no tree  height can't tell me which tree is older."   61 00:05:44,640 --> 00:05:48,320 I need more information. For  example, I would want to know   62 00:05:48,320 --> 00:05:52,160 when these trees were  planted, which tree is older. 63 00:05:52,160 --> 00:05:58,160 How tall are they? Are there other trees that are  short and old and some that are tall and young? 64 00:06:00,240 --> 00:06:05,680 One thing I do know is that tree age can  be determined by the number of tree rings. 65 00:06:05,680 --> 00:06:11,200 For each year of growth cycle, a tree gets  a ring. So without cutting down these trees,   66 00:06:11,200 --> 00:06:17,840 I may not be able to get a precise age. Also,  as you can see by these photos, the width of   67 00:06:17,840 --> 00:06:22,400 the rings can vary depending on the type of  tree and the conditions in which it is growing.   68 00:06:23,600 --> 00:06:29,680 But how could I collect data to answer my  hypothesis? I would have to measure a lot   69 00:06:29,680 --> 00:06:36,560 of tree heights of known ages and then look at  all that data and look for patterns or trends .  70 00:06:38,000 --> 00:06:41,600 So how do scientists know if  their hypothesis is correct?   71 00:06:41,600 --> 00:06:44,720 They have to collect and analyze  data. The more data they have,   72 00:06:44,720 --> 00:06:49,200 the better the results will be because  it helps filter out some of the outliers, 73 00:06:49,200 --> 00:06:50,240 the mistakes,   74 00:06:50,240 --> 00:06:55,440 errors, or oddball data. Kind of like if I  was measuring favorite Girl Scout cookies. The 75 00:06:55,440 --> 00:07:02,640 more people I sell cookies, to the better my data  will be. For example, here is a pie chart showing   76 00:07:02,640 --> 00:07:10,240 real data for my troop sales. This Girl Scout made  a single sale to one family who loves samoas and   77 00:07:10,240 --> 00:07:15,840 doesn't like thin mints. But are samoas the most  popular cookie sold by Girl Scouts nationwide? 78 00:07:16,640 --> 00:07:23,760 With this data, my hypothesis should be yes.  But is it? How could I get a better data set? 79 00:07:25,280 --> 00:07:31,120 I could collect more data. The pie chart on the  right is the data for my entire troop's sales.   80 00:07:31,760 --> 00:07:42,800 This is a much better data set because it has 1559  packages of cookies sold. That's 1554 more boxes   81 00:07:42,800 --> 00:07:49,360 than my single sale. With this much data I could  look at which ones I sold the most of and be able   82 00:07:49,360 --> 00:07:55,120 to make a better conclusion to my hypothesis  than if I'd only sold one or two boxes. The   83 00:07:55,120 --> 00:08:01,040 more data that is collected, the better. So, are  samoas the most popular according to this data?   84 00:08:02,080 --> 00:08:08,880 No, thin mints definitely are. Your troop can  do the same exercise with your troop sales. 85 00:08:08,880 --> 00:08:16,320 If you added your data to this data we'd have an  even better data set. In the pictures of the two   86 00:08:16,320 --> 00:08:22,480 trees we only have these two data points, so  we can't make a conclusion about all trees. We   87 00:08:22,480 --> 00:08:27,920 can only make a conclusion about the two trees and  we'd need a method to see how old those trees are. 88 00:08:30,080 --> 00:08:34,080 So to make the hypothesis of tall  trees are older than short trees,   89 00:08:34,080 --> 00:08:40,960 which may not be true, I'd have to measure a lot  of tree heights and be able to count their rings   90 00:08:40,960 --> 00:08:44,880 or at least measure their circumference. That's the length around the tree,  91 00:08:44,880 --> 00:08:50,000 like your arms hugging a tree. For NASA  scientists we rely on a lot of data and   92 00:08:50,000 --> 00:08:55,120 that is where you can come in. You can be  citizen scientists, measuring both tree height   93 00:08:55,120 --> 00:09:00,960 and trunk circumference. All these pictures on  this map are data points where citizen scientists   94 00:09:00,960 --> 00:09:08,320 have taken observations of tree heights around  the world. You can also take observations and add   95 00:09:08,320 --> 00:09:14,480 to this robust data set. So let me introduce  you to the GLOBE Observer tree height tool. 96 00:09:20,080 --> 00:09:26,880 Trees. Diverse, they can be towering  giants or petite saplings. Some   97 00:09:26,880 --> 00:09:29,840 live for thousands of years, recording their age in rings.   98 00:09:31,120 --> 00:09:38,080 They provide food, shade, shelter, and more  for wildlife, and for us. Some tell us when the   99 00:09:38,080 --> 00:09:44,400 seasons change through their leaves, while others  continue to stand steadfast throughout the year.  100 00:09:44,960 --> 00:09:50,720 But no matter their differences, their height  can reveal information about their ecosystems.   101 00:09:51,440 --> 00:09:56,880 By using satellites and ground-based measurements  scientists can track tree growth and monitor how   102 00:09:56,880 --> 00:10:02,960 well an ecosystem supports trees. Tree height  is also used to measure the biomass of a forest,   103 00:10:03,600 --> 00:10:07,200 allowing scientists to calculate  how much carbon is stored by trees. 104 00:10:08,160 --> 00:10:15,200 These are all important factors in conservation,  resource management, and monitoring the climate.   105 00:10:16,240 --> 00:10:21,280 By using only a smartphone and the GLOBE  Observer app, citizen scientists and students   106 00:10:21,280 --> 00:10:26,000 are helping create a global inventory of  tree height available for everyone to use.  107 00:10:28,000 --> 00:10:31,840 You can collect your own tree height data by  downloading and using the GLOBE Observer app.   108 00:10:33,440 --> 00:10:36,240 This next video will show you  how the tree height tool works,   109 00:10:36,240 --> 00:10:45,840 and what satellite data your  measurements are compared to. 110 00:11:46,240 --> 00:11:50,400 Now, I know i just showed you how to use  the app but scientists also use another   111 00:11:50,400 --> 00:11:54,400 method to measure tree height, and we are  going to make our own measuring device:   112 00:11:54,400 --> 00:12:00,480 a clinometer. Here is a list of the materials  you'll need if you have them now you can build   113 00:12:00,480 --> 00:12:05,600 it with us. If not you can easily make your own  later. Pause the video if you need to collect   114 00:12:05,600 --> 00:12:10,960 the materials and want to build along with us.  Brian Campbell from NASA GLOBE Observer and   115 00:12:10,960 --> 00:12:15,040 his son will walk you through how to build the  clinometer and use it to measure tree heights.   116 00:12:15,600 --> 00:12:20,640 This is one method of measuring trees. A  clinometer measures angles that can be used to   117 00:12:20,640 --> 00:12:27,840 calculate tree height. The GLOBE Observer app uses  your phone like a clinometer, using the internal   118 00:12:27,840 --> 00:12:33,840 algorithm in the app to calculate the height.  No math required. Hi, my name is Brian Campbell   119 00:12:33,840 --> 00:12:37,600 and I'm coming to you from Maryland in the  United States and this is my son, Andy. 120 00:12:37,600 --> 00:12:38,320 Andy: Hello 121 00:12:38,320 --> 00:12:41,040 and he's going to be helping us  out today and what we're going   122 00:12:41,040 --> 00:12:44,080 to do is we're going to show you how to build a 123 00:12:44,080 --> 00:12:51,440 homemade paper clinometer. So it looks like this  okay this is the sheet that you can find on the 124 00:12:51,440 --> 00:12:57,040 NASA GLOBE Observer website at  observer.globe.gov. What we're going   125 00:12:57,040 --> 00:13:01,200 to do is we're just going to simply build it.  Snd here are all the materials that you need.   126 00:13:01,200 --> 00:13:05,920 l should mention that a clinometer is something  that helps you measure angles so what we're   127 00:13:05,920 --> 00:13:09,680 talking about here is we're going to be measuring,  using this later on to measure the angle   128 00:13:10,640 --> 00:13:14,000 to the top of a tree, to the base of tree  to the top of the tree, to get the height   129 00:13:14,000 --> 00:13:18,320 of a tree okay just using this simple tool and  a couple things you can find around your house.   130 00:13:18,320 --> 00:13:23,040 So here's what we're going to need to be able  to build this clinometer and Andy will show you   131 00:13:23,040 --> 00:13:28,480 what you need. We need a straw like a drinking  straw. This is a paper drinking straw, okay,   132 00:13:29,040 --> 00:13:36,720 biodegradable. We have string, okay, green string.  Trees are green, I thought that'd be great. Tape. 133 00:13:39,360 --> 00:13:47,840 All right, and we have scissors. Be careful with  these, they're sharp. Okay, a pen or pencil,  134 00:13:48,960 --> 00:13:54,960 and a clipboard, so you can put your clinometer  on it, because if you're using a clinometer when   135 00:13:54,960 --> 00:13:58,960 it's windy and you're just using paper, you can  see you get a lot of movement. So when you have   136 00:13:58,960 --> 00:14:03,520 a hard surface like that it's easier to use,  okay. We'll show that a little bit later on. 137 00:14:03,520 --> 00:14:08,000 And finally a weight that you're going to  tie to the end of the string like a washer 138 00:14:08,000 --> 00:14:15,760 or a nut or it could be a paper clip, okay. This  just happens to be just a little metal ring, okay,   139 00:14:15,760 --> 00:14:21,040 kind of like a washer, a little metal ring. So  that's all we need in order to build this. So   140 00:14:21,040 --> 00:14:26,160 let's get started. First off what we're going  to do is, I'm just going to take this pen, okay, 141 00:14:26,160 --> 00:14:29,840 and the first thing I'm going to do is, there's  a little hole here, sorry, a little circle here   142 00:14:29,840 --> 00:14:35,440 that says "attach string here," a knotted string  so I'm going to just poke a hole with the pen, 143 00:14:36,080 --> 00:14:39,840 okay, just in here, I'm going  to poke a little hole in there,   144 00:14:39,840 --> 00:14:43,120 just so we can get this string. All right, 145 00:14:43,120 --> 00:14:47,840 cool. So let's just take a length of string out.  And what you want to do is just kind of measure, 146 00:14:48,480 --> 00:14:53,840 you know, so it hangs down just above the bottom  of the paper. About like that. And you're going   147 00:14:53,840 --> 00:15:02,160 to take the piece of string and just cut it.  All right so all right. You want to hold that  148 00:15:02,160 --> 00:15:11,840 while I tie this. So I'm going to tie the washer,  this metal ring, to the bottom of the string. 149 00:15:18,160 --> 00:15:21,520 All right, that should be good. I just put two knots in there. 150 00:15:22,080 --> 00:15:26,560 So then we're going to take  the other end and just,  151 00:15:28,320 --> 00:15:32,320 you know, make a couple knots  together so it makes a larger knot,   152 00:15:32,320 --> 00:15:37,520 and then I'm going to slip it through  that hole, okay, in the paper just so   153 00:15:39,120 --> 00:15:44,480 it won't slide through, okay. I have pretty  thick fingers so, you know, you might want   154 00:15:44,480 --> 00:15:50,800 to have someone do this, you know, who can do  it quickly with, you know, thinner fingers. 155 00:15:51,440 --> 00:15:55,760 All right, so there I created a little knot, so  I'm going to take this knot I'm just going to   156 00:15:56,720 --> 00:16:03,600 feed it through this hole in the clinometer, all right, So we're going to pull it through. 157 00:16:04,640 --> 00:16:09,920 All right, so it's through, now it hangs. That's a little lower than the paper but   158 00:16:09,920 --> 00:16:15,200 that's okay. If you need to what you can do is,  you can just take it and pull this out like this, 159 00:16:16,320 --> 00:16:22,240 okay, you can pull it up and then  you can just tape it to the back. 160 00:16:23,280 --> 00:16:26,640 Okay, just tape it to the back,   161 00:16:26,640 --> 00:16:30,720 so then you'll have one it's like this.  So now you have the first part of this,   162 00:16:30,720 --> 00:16:35,600 all right, now what you need to do you have  to use a straw, and I'll let Andy do this, 163 00:16:35,600 --> 00:16:40,560 this straw just needs to be taped to the  top of the clinometer because this straw 164 00:16:40,560 --> 00:16:44,640 will be your line of sight. You're going  to be looking through the straw at the top   165 00:16:44,640 --> 00:16:49,840 of the tree in order to take the tree height  measurement. So I'll line it up and let Andy 166 00:16:53,120 --> 00:17:03,840 tape it, to just put a piece of tape  here, and then piece piece of tape there. 167 00:17:07,040 --> 00:17:10,000 All right good, there's one and then you want to   168 00:17:10,000 --> 00:17:12,960 align it to this line that's on  the top of the clinometer page. 169 00:17:16,240 --> 00:17:17,840 All right, just right in there. 170 00:17:22,240 --> 00:17:32,560 Perfect. All right, so now, okay, now we have  essentially a working clinometer, all right so   171 00:17:33,760 --> 00:17:41,440 please stay tuned because we are going to walk  into the yard and take the tree height of a tree   172 00:17:42,160 --> 00:17:45,840 in our location using this  handheld clinometer. Stay tuned. 173 00:17:46,960 --> 00:17:51,200 All right, so we're outside and we're going to be  measuring the height of a tree, this tree right   174 00:17:51,200 --> 00:17:57,840 here, it's a crepe myrtle, in Maryland. And Andy is going to use a clinometer, 175 00:17:57,840 --> 00:18:02,240 and what's cool about these clinometers is, these  are fun because these can be done with two people. 176 00:18:02,240 --> 00:18:04,240 Basically it should be done  with at least two people,   177 00:18:04,240 --> 00:18:08,480 because one person has to use the clinometer  and look through the straw, the line of sight,  178 00:18:09,280 --> 00:18:11,520 and then the other person has to read the angle. 179 00:18:11,520 --> 00:18:15,280 So what we're going to do is, since we're  on a flat surface, we want a flat surface,   180 00:18:15,280 --> 00:18:19,440 so we're going to figure out the height of the  tree based on a 45 degree angle. So we're going   181 00:18:19,440 --> 00:18:23,760 to use some little geometry, trigonometry,  and some good math involved here. All right,   182 00:18:23,760 --> 00:18:28,080 and what I want to show you here on the other side  of the clinometer that you can also print out,   183 00:18:28,080 --> 00:18:35,120 on here we have a little data sheet,  where in order to figure out the   184 00:18:35,120 --> 00:18:38,160 height we have to figure out some other  observations, other measurements, okay,   185 00:18:38,960 --> 00:18:45,440 those angles. So we're basically starting off  with the height of the observer, which is Andy,   186 00:18:45,440 --> 00:18:51,840 and we're going to use inches. He is about 61  inches tall, and then we're going to figure out   187 00:18:51,840 --> 00:18:57,440 what the eye height is which is pretty easy  because you take the height of the observer,   188 00:18:57,440 --> 00:19:02,800 Andy, and subtract about four inches, okay,  that's about the distance from the top of   189 00:19:02,800 --> 00:19:07,280 his head to his eye level. It's an estimate,  you can do it exactly with a tape measure. 190 00:19:07,280 --> 00:19:12,480 But then we get that number, and then we're going  to measure at one point the distance to the tree, 191 00:19:13,120 --> 00:19:18,880 and if we wouldn't be on a flat surface we'd  be measuring the angle of, basically the slope   192 00:19:18,880 --> 00:19:23,440 of the ground, and we'd be having to figure  out the tangent of that clinometer angle. But   193 00:19:23,440 --> 00:19:28,800 because we're on a flat surface, the tangent of  45 degrees is one so, we're just going to use one. 194 00:19:28,800 --> 00:19:32,320 We're on a really flat  surface here, okay, and then   195 00:19:32,320 --> 00:19:36,320 we get the distance from the tree, which we're  going to figure out with the tape measure,   196 00:19:36,880 --> 00:19:40,800 and then we get the clinometer angle,  okay, and then that gives us what's   197 00:19:40,800 --> 00:19:45,120 called the vertical leg. So that's the,  you know, the distance from the tree 198 00:19:45,120 --> 00:19:51,440 times one, that clinometer angle gives us that  vertical leg and then we add that vertical leg to   199 00:19:51,440 --> 00:19:59,920 the eye height gives us the tree height, okay. And  if you are in inches we then can divide that by 12   200 00:19:59,920 --> 00:20:07,360 to get the tree height in feet, so pretty simple.  So first thing I'm going to do, I'm going to put   201 00:20:07,360 --> 00:20:16,400 in what his height is. I recommend also if you  print this out have it laminated or something   202 00:20:16,400 --> 00:20:21,360 like that, so you use a dry erase marker and you  can write the information in there and then you   203 00:20:21,360 --> 00:20:27,840 can erase it off when you want to do it  again. So we have your height, his height is   204 00:20:28,400 --> 00:20:33,000 61 inches, okay. His eye height is 61 minus  four. So what is 61 minus four, quickly? 205 00:20:33,000 --> 00:20:36,640 Andy: Um, 58, 59, no seven. 206 00:20:36,640 --> 00:20:37,600 There you go, 57. 207 00:20:38,560 --> 00:20:45,440 Hey, it's almost summer. 57 inches, all  right, I put them on the spot there so. Hey   208 00:20:46,560 --> 00:20:52,720 that's what dads do. Okay, now what we're gonna do  is, the clinometer angle is gonna be 45 degrees,   209 00:20:52,720 --> 00:20:55,200 it's gonna be one. I'm gonna put  a one here, but we first have to   210 00:20:56,080 --> 00:21:00,160 find out how far we are away from the  tree all right. So put my pen back in   211 00:21:00,160 --> 00:21:05,360 my pocket. I'm going to flip this over, and  then Andy is going to use the clinometer, 212 00:21:07,920 --> 00:21:11,840 all right, so he's going to hold this up  and he's going to look through the straw   213 00:21:12,400 --> 00:21:19,040 and find the tallest part of this tree and put  it through the straw here. Down there, all right. 214 00:21:22,480 --> 00:21:26,000 All right, let me move your hand here, so what the  first the other person is going to do is they're   215 00:21:26,000 --> 00:21:32,080 going to here, put it down a little bit further, yeah like that, and you're going to, what you're   216 00:21:32,080 --> 00:21:38,720 going to do is you're going to walk this way  a little bit but keep your eye level okay so   217 00:21:38,720 --> 00:21:44,960 you see the angle is changing, all right, so keep  walking towards the tree, all right keep walking. 218 00:21:44,960 --> 00:21:46,400 Keep walking towards the tree,   219 00:21:46,400 --> 00:21:49,440 this way. A little hard to do so you  might have to guide the person  . 220 00:21:49,440 --> 00:21:54,160 All right, all right, a little  more. A little more. A little more. 221 00:21:56,720 --> 00:22:01,440 All right, let me see. Let me see,  let's straighten it out. A little more. 222 00:22:03,840 --> 00:22:10,560 All right, so still there, you still looking  through this. This is a little learning   223 00:22:10,560 --> 00:22:13,680 experience. This is hard to do at first,  so you'll get used to it after a while.   224 00:22:14,560 --> 00:22:20,000 Okay so we're at about, about 45 degrees right now. Okay that's where you want to stop.  225 00:22:20,000 --> 00:22:23,040 Okay, so then I could take the  clinometer and you have to stay there,   226 00:22:24,160 --> 00:22:28,960 so just hold that, so now what I'm going to  do, I'm going to take the tape measure and I'm   227 00:22:28,960 --> 00:22:34,880 going to measure the distance from his front  of his foot, lift your toe up a little bit,   228 00:22:35,440 --> 00:22:44,880 and put it down there, all right, to the base  of a tree. So in inches that is 106 inches.   229 00:22:45,920 --> 00:22:50,320 So what we do here is, in order to  figure out the height of the tree,   230 00:22:51,200 --> 00:22:54,960 the height of the tree is  going to be the distance from   231 00:22:55,760 --> 00:23:03,600 the front of his feet to the base of the tree,  which was 106 inches, plus the height from the   232 00:23:03,600 --> 00:23:15,920 ground to his eye level. That was 57. So 106 plus  57 is ... Can you figure that out? 106 plus 57? 233 00:23:18,560 --> 00:23:21,840 160... 234 00:23:21,840 --> 00:23:22,744 Andy: Three? 235 00:23:22,744 --> 00:23:25,521 163. All right so 163 so. 236 00:23:27,680 --> 00:23:36,800 Distance was one six yep, clinometer angle, vertical leg times that, that's 106. Okay   237 00:23:36,800 --> 00:23:48,960 that's 106 plus his eye height, which was  57, all right, so that was 163 inches. 238 00:23:51,040 --> 00:23:55,680 163 inches, oh 163 divided by 12? 239 00:23:57,840 --> 00:23:59,280 A little over 13 feet. 240 00:23:59,280 --> 00:24:02,640 A little over 13 feet. That's my wife, she's  a mathematician, she is the camera person.  241 00:24:03,280 --> 00:24:06,320 So, a little over 13 feet, okay, 242 00:24:08,080 --> 00:24:13,440 So 13, about 13 feet that's pretty  good because a standard basketball hoop   243 00:24:13,440 --> 00:24:20,640 is 10 feet, that's just above that about  three feet. So that's how easy it is to use a   244 00:24:22,480 --> 00:24:28,640 hand-built paper clinometer, all right, handheld  paper clinometer, just using a straw, string,   245 00:24:28,640 --> 00:24:34,640 tape, washer, okay, a piece of paper, and  a clipboard and a tape measure, all right,   246 00:24:35,200 --> 00:24:41,200 a tape measure to get the height of a tree. So  I hope you enjoyed it. This is Brian Campbell   247 00:24:41,200 --> 00:24:45,840 and I'm out of the NASA Wallops Flight Facility  in Virginia, currently standing here in Maryland   248 00:24:46,480 --> 00:24:59,840 and my son Andy, and thank you to my wife  Jen who is the camera person. Thank you. 249 00:25:02,240 --> 00:25:06,480 A clinometer is helpful for measuring trees,  but the GLOBE Observer Trees tool has the   250 00:25:06,480 --> 00:25:11,920 clinometer built in. You can use your paper  clinometer to compare your results from the app. 251 00:25:11,920 --> 00:25:16,400 This helps make your data even stronger, since  you are validating that your instruments are   252 00:25:16,400 --> 00:25:22,800 working. That is, if they get the same result.  Now that you have a paper clinometer, let's   253 00:25:22,800 --> 00:25:27,680 learn how to use the app so you can compare your  results from your tree height measurements. This   254 00:25:27,680 --> 00:25:32,560 video will show you how to take an observation  with GLOBE Observer when you download the app. 255 00:25:32,560 --> 00:25:34,320 Hi, this is Brian Campbell 256 00:25:34,320 --> 00:25:36,000 of the NASA Wallops Flight Facility. 257 00:25:36,000 --> 00:25:37,360 I'm the Trees science lead 258 00:25:37,360 --> 00:25:38,720 for the NASA GLOBE Observer. 259 00:25:40,000 --> 00:25:41,200 Today I'm going to talk to you [about] 260 00:25:41,200 --> 00:25:43,280 how to take an actual observation using the 261 00:25:43,280 --> 00:25:45,120 NASA GLOBE Observer Trees tool. 262 00:25:46,000 --> 00:25:47,440 In order to get started 263 00:25:47,440 --> 00:25:49,200 you first have to go through the introduction. 264 00:25:49,200 --> 00:25:50,160 In the introduction 265 00:25:51,200 --> 00:25:53,760 it will ask you for some very vital information. 266 00:25:53,760 --> 00:25:56,320 You have to input your height 267 00:25:56,320 --> 00:25:57,760 and if you input your height 268 00:25:57,760 --> 00:25:59,520 what the app will do is 269 00:25:59,520 --> 00:26:01,120 it will then estimate 270 00:26:01,120 --> 00:26:03,840 the eye level of your phone's camera 271 00:26:04,880 --> 00:26:06,240 from above the ground 272 00:26:06,240 --> 00:26:08,320 and also it'll estimate your stride 273 00:26:08,320 --> 00:26:09,840 based on that height. 274 00:26:10,480 --> 00:26:11,840 You also have to 275 00:26:11,840 --> 00:26:13,520 determine if you're going to use 276 00:26:14,160 --> 00:26:17,200 the metric system or the English system 277 00:26:17,200 --> 00:26:19,200 in your observations for the units 278 00:26:19,200 --> 00:26:20,400 for your tree height measurements. 279 00:26:21,200 --> 00:26:22,560 So what we're going to do is we're going to 280 00:26:22,560 --> 00:26:23,840 get started taking this observation. 281 00:26:24,720 --> 00:26:25,920 Before we do any of this, 282 00:26:25,920 --> 00:26:28,000 want to make sure that you're aware that 283 00:26:28,000 --> 00:26:29,040 in order to do this 284 00:26:29,600 --> 00:26:30,880 the way you should be doing it 285 00:26:31,600 --> 00:26:33,200 you want to be able to do this 286 00:26:33,200 --> 00:26:36,080 safely and legally wherever you are. 287 00:26:36,080 --> 00:26:37,520 If you happen to be on private property 288 00:26:37,520 --> 00:26:38,320 where there's a tree 289 00:26:39,840 --> 00:26:41,280 make sure you get the permission. 290 00:26:41,280 --> 00:26:42,400 But you want to make sure 291 00:26:43,120 --> 00:26:46,320 that you do this safely and legally 292 00:26:46,880 --> 00:26:49,040 and follow all local jurisdictions and 293 00:26:49,040 --> 00:26:50,400 laws in your area. 294 00:26:50,400 --> 00:26:52,080 So let's get started. 295 00:26:52,080 --> 00:26:55,040 So we're going to go into the Trees tool 296 00:26:55,600 --> 00:26:57,680 and we're going to just go click trees, 297 00:26:58,240 --> 00:26:59,280 new tree observation. 298 00:27:00,320 --> 00:27:01,360 and what you get 299 00:27:01,360 --> 00:27:02,400 you'll get the time 300 00:27:02,400 --> 00:27:03,440 you'll get a date stamp. 301 00:27:04,080 --> 00:27:04,720 Time and date. 302 00:27:05,520 --> 00:27:06,800 Make sure that's right and then what 303 00:27:06,800 --> 00:27:07,920 it's going to do it's going to ask for 304 00:27:07,920 --> 00:27:08,720 surface conditions. 305 00:27:09,360 --> 00:27:11,280 We want to know what's happening 306 00:27:11,280 --> 00:27:13,040 around your local environment 307 00:27:13,040 --> 00:27:14,640 when you're taking the tree observation. 308 00:27:15,440 --> 00:27:15,940 Meaning, 309 00:27:16,640 --> 00:27:18,720 is there snow or ice on the ground? No. 310 00:27:18,720 --> 00:27:19,840 Standing water? No. 311 00:27:20,400 --> 00:27:22,960 Is it muddy? No. No dry ground. 312 00:27:23,600 --> 00:27:25,120 There are leaves on the trees, 313 00:27:25,120 --> 00:27:26,560 and it's not raining or snowing. 314 00:27:27,280 --> 00:27:28,320 So then once you do that 315 00:27:29,200 --> 00:27:30,080 you're going to take the 316 00:27:31,280 --> 00:27:32,400 measure the base of the tree. 317 00:27:33,680 --> 00:27:35,520 So this is really cool because 318 00:27:35,520 --> 00:27:37,920 you click next, measure base 319 00:27:38,640 --> 00:27:39,920 and your camera will open up 320 00:27:40,560 --> 00:27:42,080 and you're going to make sure 321 00:27:42,640 --> 00:27:44,480 that your phone's camera 322 00:27:44,480 --> 00:27:47,920 is always at your eye level. 323 00:27:47,920 --> 00:27:49,680 So, keeping it at eye level 324 00:27:49,680 --> 00:27:51,440 I'm going to go to the base of the tree 325 00:27:51,440 --> 00:27:53,040 and I'm going to align this line 326 00:27:53,040 --> 00:27:54,640 this white dotted line to it. 327 00:27:56,000 --> 00:27:57,600 There we go, it's at the base of the tree. 328 00:27:57,600 --> 00:27:59,040 I like that, I'm going to continue 329 00:27:59,040 --> 00:28:00,000 to measure the tree top 330 00:28:00,960 --> 00:28:03,360 Keeping it eye level, you're just going to angle 331 00:28:05,120 --> 00:28:06,720 the phone up to the top of the tree 332 00:28:08,160 --> 00:28:10,160 and there we go we're at the top of the tree. 333 00:28:10,160 --> 00:28:11,600 We got the top of the tree. 334 00:28:11,600 --> 00:28:12,960 So what we're doing is we're measuring 335 00:28:12,960 --> 00:28:15,360 the angle from your eye level 336 00:28:15,360 --> 00:28:16,320 to the base of the tree 337 00:28:16,320 --> 00:28:18,160 to top of the tree and the phone 338 00:28:18,880 --> 00:28:20,000 has been put 339 00:28:20,000 --> 00:28:21,360 your phone uses the 340 00:28:21,360 --> 00:28:22,720 internal magnetometer 341 00:28:22,720 --> 00:28:24,720 and the app uses that information to 342 00:28:24,720 --> 00:28:26,320 calculate these angles 343 00:28:26,320 --> 00:28:28,720 in order to get you to the to measure 344 00:28:28,720 --> 00:28:30,320 the the actual height of the tree. 345 00:28:30,960 --> 00:28:33,040 So we have the base and we have the top, 346 00:28:33,040 --> 00:28:34,560 now we want to take a picture of the tree. 347 00:28:34,560 --> 00:28:35,280 This happens to be a 348 00:28:35,280 --> 00:28:37,120 really pretty Bradford pear tree. 349 00:28:37,760 --> 00:28:39,600 So we're going to click on 350 00:28:39,600 --> 00:28:41,200 that and it takes a picture of the tree. 351 00:28:42,000 --> 00:28:44,800 Now, since I'm on a flat surface what I'm 352 00:28:44,800 --> 00:28:46,000 going to do is I'm going to walk 353 00:28:46,000 --> 00:28:48,560 normally to the tree, okay. 354 00:28:48,560 --> 00:28:49,920 You should ultimately be about 355 00:28:49,920 --> 00:28:52,080 25 to 75 feet away from the tree. 356 00:28:52,080 --> 00:28:54,960 I'm about at, you know, 25 to 27 feet away 357 00:28:54,960 --> 00:28:55,460 from the tree. 358 00:28:56,000 --> 00:28:57,200 A I walk towards a tree, 359 00:28:57,200 --> 00:28:58,560 I'm gonna walk normally. 360 00:28:58,560 --> 00:28:59,920 That's super important 361 00:28:59,920 --> 00:29:02,240 to walk normally to the base of the tree, 362 00:29:02,240 --> 00:29:03,920 normal steps, because that's what 363 00:29:03,920 --> 00:29:06,720 the app based your stride on 364 00:29:07,280 --> 00:29:09,520 with your height that you input into the 365 00:29:09,520 --> 00:29:10,400 introduction section. 366 00:29:11,280 --> 00:29:13,440 I should also mention that there is a 367 00:29:13,440 --> 00:29:15,120 tutorial section in the app 368 00:29:15,120 --> 00:29:17,920 that you need to do before you start so 369 00:29:17,920 --> 00:29:19,440 you can learn exactly how to do the tree 370 00:29:19,440 --> 00:29:20,240 height observation 371 00:29:20,240 --> 00:29:21,520 Now I'm going to walk to the tree 372 00:29:21,520 --> 00:29:22,240 and I'm going to walk 373 00:29:22,880 --> 00:29:24,800 normally to the tree, normal steps 374 00:29:24,800 --> 00:29:26,400 counting my numbers out loud. 375 00:29:26,400 --> 00:29:26,960 So here we go. 376 00:29:27,920 --> 00:29:28,420 One, 377 00:29:28,800 --> 00:29:29,300 two, 378 00:29:29,760 --> 00:29:30,260 three, 379 00:29:30,560 --> 00:29:31,060 four, 380 00:29:31,360 --> 00:29:31,860 five, 381 00:29:32,240 --> 00:29:32,960 six, 382 00:29:32,960 --> 00:29:33,460 seven, 383 00:29:33,840 --> 00:29:34,340 eight, 384 00:29:34,720 --> 00:29:35,220 nine, 385 00:29:35,520 --> 00:29:36,240 ten, 386 00:29:36,240 --> 00:29:36,740 eleven, 387 00:29:37,200 --> 00:29:37,700 twelve, 388 00:29:38,080 --> 00:29:38,880 thirteen, 389 00:29:38,880 --> 00:29:39,600 fourteen, 390 00:29:39,600 --> 00:29:40,100 fifteen, 391 00:29:40,480 --> 00:29:41,360 sixteen, 392 00:29:41,360 --> 00:29:42,400 seventeen, 393 00:29:42,400 --> 00:29:42,960 eighteen. 394 00:29:43,600 --> 00:29:44,560 Eighteen steps. 395 00:29:44,560 --> 00:29:47,360 So you input that into the box, 18 steps. 396 00:29:48,720 --> 00:29:50,160 Now what it's going to do is 397 00:29:50,160 --> 00:29:51,360 it's going to go to the location. 398 00:29:52,320 --> 00:29:54,400 It'll give you the latitude, estimate the 399 00:29:54,400 --> 00:29:57,040 latitude and longitude of the tree, okay. 400 00:29:57,040 --> 00:29:59,440 It'll tell you what you think the 401 00:29:59,440 --> 00:30:01,600 what the app thinks your estimated accuracy is. 402 00:30:02,320 --> 00:30:04,480 And if you like it you can hit set position, 403 00:30:04,480 --> 00:30:06,880 but if you don't what you can do here 404 00:30:07,680 --> 00:30:09,840 you can go to a map, and this map 405 00:30:09,840 --> 00:30:10,880 you can move 406 00:30:11,440 --> 00:30:14,160 with two fingers and say exactly where 407 00:30:14,160 --> 00:30:15,440 that tree is, okay. 408 00:30:16,400 --> 00:30:19,520 So I think it's right about here, okay. 409 00:30:20,400 --> 00:30:21,440 So once I set it, 410 00:30:21,440 --> 00:30:22,480 I hit set position. 411 00:30:23,360 --> 00:30:24,640 Then you're going to come to a screen 412 00:30:24,640 --> 00:30:25,920 that says circumference. 413 00:30:26,480 --> 00:30:28,640 If you have a tape measure available 414 00:30:29,760 --> 00:30:32,240 you can then take the circumference. 415 00:30:32,240 --> 00:30:34,880 of the tree at breast height about four, 416 00:30:34,880 --> 00:30:37,040 four and a half feet above the ground surface. 417 00:30:37,040 --> 00:30:37,540 All right. 418 00:30:38,160 --> 00:30:39,840 Now I should also mention that 419 00:30:40,560 --> 00:30:42,960 since we did it this way we're on a flat surface. 420 00:30:44,640 --> 00:30:47,040 If you happen to be on an area that's 421 00:30:47,040 --> 00:30:49,280 very sloped, like you're walking 422 00:30:49,280 --> 00:30:50,960 uphill to the base of the tree or you're 423 00:30:50,960 --> 00:30:53,280 walking downhill to the base of the tree 424 00:30:53,920 --> 00:30:55,440 what you can do is 425 00:30:56,080 --> 00:30:57,920 you can pull out that tape measure 426 00:30:57,920 --> 00:31:00,000 and from where you took the observation 427 00:31:00,000 --> 00:31:00,880 from originally 428 00:31:01,680 --> 00:31:04,720 you can measure the exact distance from the 429 00:31:05,520 --> 00:31:07,520 location of where you were standing to 430 00:31:07,520 --> 00:31:08,400 the base of the tree. 431 00:31:09,200 --> 00:31:10,720 Then you can put that information 432 00:31:11,440 --> 00:31:12,000 excuse me 433 00:31:12,000 --> 00:31:12,640 in this section. 434 00:31:13,760 --> 00:31:17,360 This section here is the review section. 435 00:31:17,360 --> 00:31:20,160 It gives a camera height, the stride length, 436 00:31:20,160 --> 00:31:21,840 the number of steps you put 437 00:31:21,840 --> 00:31:22,880 distance to the tree 438 00:31:22,880 --> 00:31:25,680 and then in the yellow section 439 00:31:25,680 --> 00:31:29,120 the calculated tree height and 440 00:31:29,120 --> 00:31:30,880 If you don't like something in here or 441 00:31:30,880 --> 00:31:32,640 you took the actual measurement from the 442 00:31:32,640 --> 00:31:33,360 base of the tree 443 00:31:34,480 --> 00:31:35,600 from the location where you're 444 00:31:35,600 --> 00:31:37,280 standing to the base of the tree, 445 00:31:37,280 --> 00:31:38,720 you can hit the edit button 446 00:31:38,720 --> 00:31:40,480 and you can put that distance to tree 447 00:31:40,480 --> 00:31:41,120 right in here. 448 00:31:42,240 --> 00:31:45,840 Once you do you just hit finish, okay. 449 00:31:46,640 --> 00:31:48,480 So then all that information then 450 00:31:48,480 --> 00:31:52,560 will be sent to the GLOBE database 451 00:31:52,560 --> 00:31:53,600 where researchers 452 00:31:53,600 --> 00:31:54,720 student researchers 453 00:31:54,720 --> 00:31:56,640 professional researchers and citizen scientists 454 00:31:56,640 --> 00:31:58,640 can access that information. 455 00:31:59,200 --> 00:32:01,280 So I'm going to send my trees data now. 456 00:32:02,640 --> 00:32:04,640 It's being sent to GLOBE. 457 00:32:05,360 --> 00:32:06,960 And then there are places on the app 458 00:32:06,960 --> 00:32:08,720 that you can go look to see where you 459 00:32:08,720 --> 00:32:10,480 actually took your tree height observations. 460 00:32:11,760 --> 00:32:13,760 Before we finish, okay, that's the 461 00:32:13,760 --> 00:32:15,680 actual tree height observation, okay, 462 00:32:16,320 --> 00:32:18,960 but before we finish this little clip here 463 00:32:19,520 --> 00:32:21,760 a couple things I want to focus on to 464 00:32:21,760 --> 00:32:23,680 make sure that you remember is that 465 00:32:24,320 --> 00:32:26,160 you always want to keep 466 00:32:26,160 --> 00:32:27,600 the phone at eye level 467 00:32:27,600 --> 00:32:29,200 when you're taking the measurements, okay. 468 00:32:29,840 --> 00:32:32,080 So always at eye level, that's the most 469 00:32:32,080 --> 00:32:33,520 important part, because if you 470 00:32:33,520 --> 00:32:34,960 if you look at the base of the tree and 471 00:32:34,960 --> 00:32:36,560 you go like this or you go to the top of 472 00:32:36,560 --> 00:32:37,520 the tree like this, 473 00:32:38,080 --> 00:32:40,560 you're changing the angle at which you're 474 00:32:41,680 --> 00:32:43,520 viewing the base and the top of the tree. 475 00:32:43,520 --> 00:32:45,280 An important thing to remember 476 00:32:45,280 --> 00:32:48,320 is that if you have multiple people 477 00:32:49,360 --> 00:32:52,240 taking observations using the same device, 478 00:32:53,840 --> 00:32:55,920 what you need to do is you need to 479 00:32:55,920 --> 00:32:57,280 change the height 480 00:32:57,280 --> 00:32:59,360 of the observer each time. 481 00:32:59,360 --> 00:33:01,280 Because we're assuming that they're going to 482 00:33:01,280 --> 00:33:02,320 be at different heights so 483 00:33:02,960 --> 00:33:04,160 if they're of different heights but 484 00:33:04,160 --> 00:33:05,360 using the incorrect height, 485 00:33:05,360 --> 00:33:07,680 the tree height observation will be incorrect. 486 00:33:07,680 --> 00:33:09,840 It'll be an erroneous tree height observation. 487 00:33:11,280 --> 00:33:12,800 How you can remedy that, 488 00:33:13,520 --> 00:33:14,800 when you go into the Trees tool, 489 00:33:16,400 --> 00:33:17,520 there's a little question mark 490 00:33:17,520 --> 00:33:18,960 that's the help section. 491 00:33:18,960 --> 00:33:20,560 You click on help, and it says 492 00:33:20,560 --> 00:33:22,720 change current user height settings. 493 00:33:23,520 --> 00:33:25,680 When you can do that you can go right 494 00:33:25,680 --> 00:33:28,160 in and change the height of the observer 495 00:33:28,160 --> 00:33:29,440 about to take the observation. 496 00:33:30,720 --> 00:33:33,600 So hopefully all this helped you in 497 00:33:33,600 --> 00:33:34,960 understanding how easy it is 498 00:33:35,520 --> 00:33:37,600 to take a tree height observation 499 00:33:37,600 --> 00:33:39,760 using the NASA GLOBE Observer Trees tool. 500 00:33:40,400 --> 00:33:41,440 Have fun 501 00:33:41,440 --> 00:33:43,440 using the NASA GLOBE Observer Trees tool 502 00:33:44,160 --> 00:33:46,720 and thank you for all your vital 503 00:33:46,720 --> 00:33:51,840 tree height observations. 504 00:33:55,440 --> 00:34:00,240 If you want to get started as a GLOBE observer,  ask your troop leader to register your troop   505 00:34:00,240 --> 00:34:07,520 through SciStarter, then send you the link  to set up your account. Once you have a troop   506 00:34:07,520 --> 00:34:12,160 SciStarter account, you will choose which  citizen science opportunity interests you. 507 00:34:12,800 --> 00:34:17,200 If you want to use the GLOBE Observer app  to measure trees, choose GLOBE Observer   508 00:34:17,200 --> 00:34:22,480 Trees. There are a lot of different citizen  science projects including others with NASA   509 00:34:23,040 --> 00:34:29,840 and others with GLOBE Observer. We have Land Cover,  Clouds, Mosquito Habitat Mapper, as well as Trees, 510 00:34:29,840 --> 00:34:33,840 and you may be interested in contributing  data to these projects as well. 511 00:34:36,000 --> 00:34:41,280 Once you've chosen your project, then you need to  download the app. It's available on Google Play or   512 00:34:41,280 --> 00:34:49,040 at the App Store. Register as a GLOBE observer, then  start collecting your data. So now you've learned   513 00:34:49,040 --> 00:34:54,800 to think like a citizen scientist by observing, collecting, and analyzing data. The next step is   514 00:34:54,800 --> 00:35:01,680 to collect and analyze your own data by using the  app. Then, as you work toward completing your Think   515 00:35:01,680 --> 00:35:06,320 Like a Citizen Scientist Journey, consider  how you might use your data to take action. 516 00:35:06,960 --> 00:35:11,680 What kind of take action project could you  think of doing? You could plant a tree and   517 00:35:11,680 --> 00:35:17,200 track its growth, create a program to teach other  Girl Scouts about a tree or tree species that's   518 00:35:17,200 --> 00:35:22,560 important to you, start a hiking group and take  tree height observations as part of your walk. 519 00:35:23,520 --> 00:35:28,080 If you know of a place that is undergoing changes, like a new building being built or a development, 520 00:35:28,080 --> 00:35:33,040 or a place where regrowth is happening like  after a landslide or a forest fire, but of course   521 00:35:33,040 --> 00:35:39,280 only if it's safe to do so, monitor that change  with scheduled observations. On a road trip you   522 00:35:39,280 --> 00:35:43,920 could take tree height observations of trees  at your stops along the way. You can even   523 00:35:43,920 --> 00:35:47,680 use this information to make observations  about tree heights in different locations. 524 00:35:48,640 --> 00:35:53,120 You can take tree heights and land cover  observations from the same place at different   525 00:35:53,120 --> 00:35:57,440 seasons, and then compare the changes to the tree  height from year to year and look for differences   526 00:35:57,440 --> 00:36:02,880 between the images to learn more about seasonal  effects on the land. And another idea is that   527 00:36:02,880 --> 00:36:08,800 you could create a team with your troop, council, or  service unit, and then go out and take observations   528 00:36:08,800 --> 00:36:15,520 as part of that citizen science team. We would also  love for you to share your take action projects   529 00:36:15,520 --> 00:36:20,560 inspired by GLOBE Observer. Please share on  social media or email us at GLOBE Observer. 530 00:36:22,640 --> 00:36:27,760 What I love about Girl Scouts is that you all  leave the world a better place. I for one am   531 00:36:27,760 --> 00:36:32,560 really excited that you are leading the future for  us. Thanks for joining the NASA GLOBE Observer and   532 00:36:32,560 --> 00:36:37,840 Girl Scouts Think Like a Citizen Scientist  Journey and enjoy the path along the way.