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UCI Geography Map Worksheet

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CEE 81B Homework #6 Civil Engineering Practicum II, Winter 2022 Geographic Coordinate Systems & Geoprocessing Tools Due Date: Due before the start of your next lab session. When submitting your homework, please upload it to Canvas as a single .pdf file. The file name should include the assignment number, your first and last name, and your student ID number (e.g., HW6_FirstName_LastName_12345678.pdf). Double (triple) check that all parts of your homework have been saved before submitting. Shapefiles: The following files have been compressed into the Data_HW6.zip file linked in Canvas. Download and extract its contents. Inside are the files that you will need to complete this homework, which include the following folders: 1. BLM_National_Fire_Perimeters 2. Highways 3. States 4. USUrbanAreas Overview: In this homework, you will create a File Geodatabase for storing your layers. You will make sure that all your data layers have the same Geographic Coordinate System. You will use Geoprocessing Tools for both Map 1 and Map 2, in addition to Select by Location for Map 2. You will include a screenshot of your FileGDB as the last page of your homework PDF again. Part 1 – FileGeodatabase: • Again, before doing anything else… your “Home” folder in your Catalog pane should be the directory that you saved your map to. o In the Catalog pane, right click the Home folder’s name → New → FileGeodatabase o Rename the .gdb. o Right-click it → Select Make Default Geodatabase (Now all the new layers you create will automatically be stored in this .gdb) • You will use your FileGDB for the whole homework (for all the maps) o After you have completed all the maps for this homework, you will take a screen shot of your FileGDB with all your layers listed within it. ▪ You will include this as the last page of your submitted homework PDF 1 of 12 Part 2 – Geographic Coordinate System (GCS) You will repeat this part for both of your maps. After you add the layers into ArcMap, check their Geographic Coordinate Systems. They all need to be the same! If any are different, you will need to project them into the same coordinate system. To do this, just right-click the layer → Properties → Source and look at what is listed for Geographic Coordinate System (see screenshot below). 2 of 12 To change a layer’s GCS, do the following: 1. Go to ArcToolbox → Data Management Tools → Project 3 of 12 2. In the Project window a. Select the layer you want to transform (use the drop-down below “Input Dataset or Feature Class”) b. Make sure the file path and name are correct for the Output Dataset or Feature Class c. Use the button to the right of the blank field for Output Coordinate System to i. Search through the folders (either in Layers or search through the other folders for the GCS or projection that you need) • Note: If you only need to make a layer match the others, go to the Layers folder, and select the GCS you want to switch too. Since the Layers folder contains all the GCS contained within the current map, you will be sure that you are using the same GCS as the other layers. However, if you needed to change all your layers to some other projection and/or GCS not currently being used, you would search through all the different ones listed in the other folders. ii. select the GCS or projection you want to apply. a b c i ii 4 of 12 3. Then click OK 4. Click OK again in the Project window, and wait for your new layer to project a. This will create a new layer! Remove the old one with the other coordinate system so you don’t accidently use it. Part 3 – Buffer and Intersect Create a map of highways within 10 miles of urban areas in the continental U.S. using the Intersect tool. You will need the States, USUrbanAreas, and Highways layers for this. Your map should look like: Steps for Map 1: After saving your map, creating and setting your new default FileGDB, and making sure all layers have the same GCS… 1. Create a 10 mile Buffer using the USUrbanAreas layer (this will take awhile to process due to the size of the layer’s data set) 2. Use the Highways layer and the UrbanAreas_Buffer layers as inputs in the Intersect geoprocessing tool by using the Input Features dropdown. 5 of 12 a. Make sure the Output Feature Class (the new layer that will be created) will be output to the correct location (your HW6.gdb) and has a name that makes sense. b. Change the Output Type to LINE. a b 3. Change the colors of your layers so that… a. The basemap (States) layer does not conflict with being able to see the other layers. i. The Hollow preset was used in the example map and the outline color was changed to a lighter gray, so the borders don’t look like part of the Highways layer. b. The Intersecting Highways layer is clearly visible and is the brightest of the colors (this is the focus of the map). c. You will want to set the outline color for the urban areas to no outline. i. A dark gray was used for their fill in the example map so that the bright blue of the Intersecting Highways layer shows up well. 4. Add your map components in Layout View and then export your finalized map to PDF. 6 of 12 Part 4 – Clip, Buffer, Select by Location, and Legend Styles You will create a map using only California from the States layer as your basemap. Then USUrbanAreas for within California will be used to isolate out fire perimeters from the BLM_National_Fire_Perimeters “fper_poly” layer. You will select fire perimeters with a size >500 acres, from the years 2000-2020, and that are within 50 miles of urban areas. The fire perimeters should be categorized by Incident General Cause. You will need to change the layout style for the layers in your legend. Your finished map should look like: Steps for Map 2: After saving your map, checking the default FileGDB, and making sure all layers have the same GCS… 1. Select California within the States layer and use Data → Export Data to extract it out to its own layer. Remove the original States layer once you have the new California layer. 7 of 12 2. Clip both the fper_poly and USUrbanAreas layers using the California layer to create a CA_Fires layer and a CA_UrbanAreas layer. Remove the original fper_poly and USUrbanAreas layers. 3. Use Select by Attribute to select fire extents within the CA_Fires layer that meet the following criteria, export all that match these criteria to a CA_LargeFires layer. FIRE_DSCVR_CY >= 2000 AND FIRE_DSCVR_CY 500 4. Create a 50 mile Buffer using the CA_UrbanAreas layer. 5. Use the CA_UrbanAreas_Buffer you just created in Select By Location to select all CA_LargeFires that fall within (even if only just a small piece of the perimeter) 50 miles of urban areas. This will be your CALargeFires_nearUrban layer that will be shown in your finalized map. a. Note: We are using Select By Location, because we want to keep the whole fire perimeter, even if part of it falls outside of the Buffer… Clip will only keep the actual piece that visually overlaps with the Buffer layer, and we don’t want that in this map. b. Select By Location steps (see screenshots below): i. In the Selection menu, click Select By Location ii. In the Select By Location pop-up window 1. Selection Method should “select features from”. 2. For Target layer(s) check the box next to the CA_LargeFires layer 3. Source layer should be set to the CA_UrbanArea_Buffer. 4. And the Spatial selection method for target layer feature(s) should be set to “intersect the source layer feature”. 5. Click Apply, and double-check in the main map that all the fire perimeters that overlap (in part or in whole) with the CA_UrbanAreas_Buffer layer have been selected as expected. 6. If it all looks good, click OK. c. Once the fire perimeters within 50 miles of urban areas have been selected, export them from the CA_LargeFires layer to a new layer CA_LargeFires_nearUrban. 8 of 12 i 1 2 3 4 6 5 6. To color the fire perimeters by incident cause a. Go into your CALargeFires_nearUrban layer’s symbology and select Categories → Unique Values. b. Select “Incident General Cause Name” in the Value Field. c. Click the All Values button to add all the unique values from that data column. d. Uncheck “”. e. Change the Labels for the 4 categories so that they match the shortened names shown in the Value column. The category names that show here will display in the legend. f. Change the fill and colors of each of the values by clicking the colors to the left of the Value names. Choose colors that are bright and stand out, yet are still easy to tell the difference between the different categories (e.g. Human and Natural should stand out clearly from each other, while the Unknown and Undetermined can match each other in color since they mean the same thing but should be clearly different from Human and Natural) i. In the example map, the “10% simple hatch” was used for the fill texture of the fire perimeters since it adds plenty of color but also allows us to see other polygons that may be displayed behind the topmost fire perimeter. Just change the fill color and outline color for each category. 9 of 12 b a d e f c f.i 7. Give the California basemap layer a 20% Gray fill and no outline. 
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