Exercise 8 Parts 1 and 2

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Exercise 8 Problems—Part I—Internet Name: Brandon WhitakerRoss ArcGIS Online In this section you view data layers in ArcGIS Online. ArcGIS Online provides users with multiple datasets and the ability to analyze data. You will need to create a free account to use ArcGIS Online. Go to the Hess Labs Media Website and Exercise 8, then select go to ArcGIS Online (https://www.arcgis.com/home/index.html) and click on “Start a Free Trial” to create your account and begin your free trial. (Note: If you are a student of an institution with ArcGIS Online access, you may already have an ArcGIS Online account available via your educational [e.g., edu] email address. Please check with your institution’s Information Technology office to determine if this is the case.) On the next page fill out the necessary information and follow the steps of setting up your account. After you have set up your account, sign into ArcGIS online and click on “Map.” This will take you to the main Map page where you will be able to analyze spatial data and create maps online. You should see a screen that resembles Figure 8-5. Initial map screen in ArcGIS Online. Map image is the intellectual property of Esri and is used herein under license.  A GIS map of the United States should appear. Note that three tutorials are along the left side of the screen, which you could use to acquaint yourself with some of the basic abilities of ArcGIS Online.  You will now add a remote sensing data layer for a basemap. Click on “Basemap” and then on “Imagery.” The map should now show an image of the United States.  Note the search box in the upper right corner of the map. Type in your address as completely as you can (e.g., 620 East 800 North, Provo, Utah 84606) and press the Return key. 1. How close is the map location to the actual location of your home? If it is not close, what are some reasons why? The map is pretty accurate to the area of my home. Highest Points

Find the Terrain dataset to your map by clicking on “Add,” then “Browse Living Atlas Layers.” The top layer should be “Terrain.” (If the top layer is not Terrain, click on the filter icon , then select “Environment> Elevation and bathymetry.” Terrain should now be the top layer in the list.) Click the name of the dataset to open up a small window to the right that describes more about the dataset. 2. What is the description of the dataset? Add the layer to your map by clicking on the plus button on the bottom right of Terrain’s tile. The terrain layer becomes the top layer and obscures the image below. To see the image below, make the terrain layer 50% transparent by clicking on “Details,” then “Content,” and then clicking on the three dots below and to the right of the Terrain data layer. You can determine the characteristics of any spot in the map by clicking your cursor on the point of interest in the map. 3. Mount Marcy is the highest point in New York state. Using the search tool (where you typed in your address) and the terrain layer, determine the elevation of Mt. Marcy in meters (do this by clicking your cursor as close as you can to Mount Marcy). 1,629 meters Perform a web search to determine the highest point in your state. Then, use the map to determine its elevation in meters. 4. What is the highest point of your home state? Wheeler Peak 5. What is its elevation? 4,013.3 meters 6. What is the highest spot in the conterminous United States? What is its elevation? Mount Whitney the elevation is 4,418 meters. 7. What is the elevation of your home address? The elevation of my home is 2.7432 meters.

Earthquake Risk Earthquakes are one of the biggest natural disaster risks in some parts of the world. In this exercise you will add the USA Earthquake Risk layer to your map and assess the earthquake risk in several areas.  Find the USA Earthquake Risk layer by selecting “Add” then “Browse Living Atlas Layers.” Next type in “USA Earthquake Risk” into the search bar that says “Search for layers.”  Add the layer to your map by clicking on the plus button.  Click “Details” then “Content” on the left side of the screen, then click on the ellipses below the layer name and select “Show item details.” A new screen should appear in your web browser that describes the dataset in the Description and Dataset Summary sections. If more information about the dataset is desired, users can click on “Link to source metadata” toward the bottom of the page. Answer the following questions about the dataset. 8. What can you do with this layer? 9. What areas do the data cover? 10. How is ground acceleration different from the Richter scale? 11. Who owns the dataset? 12. When were the data created? Zoom out to the entire United States to examine the earthquake risk trends throughout the continental United States. 13. What are the general trends of earthquake risk in the continental United States (i.e., where is earthquake risk high and where is risk low)? Sometimes it is useful to make a layer transparent so that the basemap (in this case the imagery) can be seen below the layer. Click on the ellipses below the USA Earthquake Risk layer name and select “Transparency.” Set transparency to 50%. 14. What happened to your map? 15. Did this make it easier or more difficult to interpret earthquake risk in the United States?

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Exercise 8 Problems—Part II—Internet In this exercise you will determine the number of earthquake epicenters in Utah counties during 2015 and 2016 by importing two files and using the “Summarize Within” command in ArcGIS Online. The first file is an earthquake epicenter dataset is maintained by Utah’s Automated Geographic Reference Center (AGRC). The original dataset contains epicenters throughout Utah from 1850–2016. This exercise only uses epicenters that occurred in 2015 and 2016 and was exported into a text file that can be uploaded directly to ArcGIS Online (Utah_EQs.csv). More information about Utah’s earthquakes and this dataset can be found at the Utah Geological Survey’s website on geological hazards—Utah faults (https://geology.utah.gov/hazards/earthquakes/utah-faults/). The second file is a Utah counties dataset maintained by Utah’s AGRC (Utah_County_Boundaries.zip). This dataset is contained in a Shapefile that has been compressed into a file that ArcGIS online can import directly. After adding both datasets to a map, you will use the “Summarize Within” command that finds features that are within the boundaries of a polygon layer. In this case, you will determine the number of earthquake epicenters in each Utah county for both years.  Log into your ArcGIS online account.  Click on “Map” at the top of the screen.  Go to the Hess Labs Media Website and Exercise 8 where you’ll find the two files. Add the “Utah_County_Boundaries.zip” dataset and “Utah_EQ.csv” table to your map by clicking on “Add” and “Add Layer from File.” Click “Choose File” and from the lab website select the data set to import.  After adding each file, under number 2, Select a drawing Style, select “Location” (Single Symbol). Then, click on “Done.” Only one dataset may be added at one time, so you will need to go through this process twice, once for each layer. After adding both layers, your map should look similar to Figure 8-6 (note: your colors may be different). You will now determine the number of earthquake epicenters in each county. Click on “Analysis” -> “Summarize Data” -> “Summarize Within” and make sure your fields are filled out as seen in the screen capture shown in Figure 8-7 (note the “Save result in” field will look different for you). Click on “Run Analysis.” Please be patient; this process could take a few minutes to complete.

Your new layer should be added automatically to your map and appear similar to the screen shot in Figure 8-8. If your map does not look like this, arrange your data layers in the following order: 1. Summarize Utah EQs within Utah County Boundaries 2. Utah EQs 3. Utah County Boundaries. You can arrange data layers by clicking and dragging each layer’s name in the “Content” window. In this map, the total number of earthquake epicenters is represented by a graduated circle symbol; the bigger the symbol, the higher the number of epicenters in the county. Click on the table icon below the name of your new layer (if you do not see the table icon, hover your cursor over the layer’s name). This opens the layer’s table that you will need for the next questions. The “Count of Points” column contains the total number of epicenters in each county. Click on this column and select “Sort Descending” to rank the records in the table from highest number of epicenters to lowest number of epicenters (Figure 8-9). 1. What county had the highest number of earthquake epicenters (county name is found in the column “Name”)? 2. How many epicenters did the county measure in 2015–2016? 3. Which counties had no recorded earthquake epicenters in 2015 and 2016? Click on the “Count of Points” column name again and select “Statistics.” 4. What is the average number of earthquake epicenters in Utah counties in 2015 and 2016? 5. What is the standard deviation of earthquake epicenters in Utah counties?

Exercise 8 Parts 1 and 2

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