Lab_3_Instructions

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San Diego State University *

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220

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Civil Engineering

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Dec 6, 2023

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CIVE 220 1 SDSU Homework 3 Instructions Fall 2023 Civil Engineering 220 – Fall 2023 Vector & Raster Data Due Tuesday, 9/19/23 at 9:00 pm The objective of this assignment is to become familiar with Raster and Vector Data and to compare ground elevations from two sources: GPS and Satellite. The data you will use is: ▪ dem – Digital Elevation Model (DEM) of SDSU area with elevation units in meters 1. Obtain a GPS (Global Positioning System) unit from the instructor, along with the coordinates for the point you are to find, and a map with potential locations. There are instructions for the operation of the GPS unit on Canvas in the “Course Materials” module. a. Go outside, turn on the GPS unit (lower button on right), and wait for it to acquire available satellites. This may take several minutes. Once your unit is ready, Latitude and Longitude values will be displayed (you may need to go back to satellite page). b. Use the GPS to find your assigned point on campus. To manually enter the coordinates for a waypoint, follow these steps: i. Press and hold the thumbstick for more than 2 seconds – this will bring up a “ Mark Waypoint ” screen on the display. ii. Scroll to the “Waypoint” field on the display and select it by pressing the thumbstick. Edit the name to be “Point.” iii. Scroll to the “Location” field and select it. Enter the coordinates of your point and select OK in the bottom right corner. iv. From the Main Menu, scroll to “Find,” select “Waypoints” and select the p oint that you just entered. v. Scroll to the bottom right corner and select “Go To.” vi. Follow the directions to the location of your point. You can use the up and down arrow buttons on the left side of your unit to zoom out or in. c. Once you find your location, place the GPS unit on the ground near your point (within about 5 meters, or 15 feet, of your point), leave it there for 10-15 seconds, and then record the elevation. Move the GPS unit slightly (a few feet) and repeat nine times to record a total of 10 elevation values . d. Turn off the unit, return to the computer lab, and return the GPS unit to the instructor. 2. Create a folder named “Lab _3 ” in the “CIVE220” folder on your USB drive. 3. Download the mapdata zip file from Canvas to your Lab_3 folder. Extract the map data so that it can be viewed in ArcGIS Pro. (Refer to Lab 2 Notes for instructions.) 4. Open ArcGIS Pro and add your downloaded/uncompressed map data: a. Open ArcGIS Pro: Windows Start button → ArcGIS → Ar cGIS Pro b. Under “New Project,” click on “Map.” c. In the “Create a New Project” window, designate the project name (CIVE220_H3_LastName_FirstName) and location (Lab_3 folder on your USB drive) and click OK. Lab #3

CIVE 220 2 SDSU Homework 3 Instructions Fall 2023 d. Connect to the folder containing your map data: i. In the Catalog pane (on the right of the screen), expand Folders: ii. Right click on Folders and click “Add Folder Connection.” iii. In the “Add Folder Connection” dialog box, browse to your Lab_3 folder, select Lab 3 mapdata, and click OK. e. Add your map data to your map: i. In the Catalog pane, expand Lab 3 mapdata: ii. Right click on the file named “DEM” and choose “Add To Current Map.” 5. Save your Project: Project → Save Project (or Ctrl+S) 6. Convert the Latitude and Longitude of your assigned point from Degrees-Minutes-Seconds (DMS) to Decimal Degrees (DD) with 6 decimal places , using Excel. 7. Create an input file to import the coordinate data (in decimal degrees) into ArcGIS Pro: a. Open Notepad (type Notepad in the search field next to the Windows button to find the application) b. Type the word Latitude and press Tab; Type the word Longitude and press Enter c. Type the latitude value in decimal degrees with 6 decimal places (make sure to include a negative sign if necessary) and press Tab d. Type the longitude value in decimal degrees with 6 decimal places (make sure to include a negative sign if necessary) and press Enter e. Take care not to put any extraneous keystrokes in your Notepad file (e.g., spaces, tabs, enters, commas) f. Save As “GPSpoint.txt” in your Lab 3 mapdata folder (with your other map data) and close Notepad 8. Add the coordinate file that you just created (GPSpoint.txt) to ArcGIS Pro. You may need to right click on “Lab 3 mapdata” in the Catalog pane and select “Refresh” so that the file displays. Right click on the file named “ GPSpoint.txt ” and choose “Add To Current Map.” 9. To display your point on the map, right click on the standalone table “GPSpoint.txt” in the Contents pane and select “ Display XY Data. ” The “Display XY Data” dialog box will open. (See Lab 3 Notes for more information.) Click on the yellow folder icon to the right of the “Output Feature Class” field and navigate to the Lab 3 mapdata folder on your USB drive. Name the Output Feature Class “ GPSpoint. ” Verify that the fields are correct (X Field: Longitude; Y-Field: Latitude; Coordinate System: GCS_WGS_1984) and press OK. 10. Zoom into your point. You may want to change the appearance of the point to make it more easily discernable (Hint: Double-click on the symbol for the GPS point in the Contents pane to open the Symbology pane on the right side of the screen. Choose the desired symbol from the G allery. Select “Properties” to change the color, size, etc. ) 11. Open Word and save a blank file in your Lab_3 folder using the standard file name: ▪ CIVE220_HomeworkNumber_LastName_FirstName (Example: “CIVE220_H3_Parsons_Tammy”) (this will have file extension .docx) 12. In your Word file, type the following standard heading (centered, single-spaced): Name CIVE 220, Fall 2023 Homework #3 13. Answer each of the following questions in full sentences. As needed, provide supporting window captures, measured values, calculations and discussion to clearly present your answers for each question.

CIVE 220 3 SDSU Homework 3 Instructions Fall 2023 Lab 3 – Homework Tasks and Questions: 1. Zoom in close to your point and use the Explore tool to determine the elevation just next to your point (do not click on the point; click on the DEM pixel/cell in which the point is located). In your Word file, state the elevation of the Digital Elevation Model (DEM) next to your point. Specify which point number you were assigned. Give answer with 3 decimal places and include units. 2. In Excel, enter the 10 elevation values you measured for your point with the GPS. If these elevations are not in meters, convert them to meters. Calculate the mean elevation in meters. In your Word file, list the 10 elevation values measured with the GPS (no decimal places; include units). 3. What is the mean elevation value from the GPS in meters with 3 decimal places? 4. Assuming the Digital Elevation Model (DEM) is the control (correct elevation), what is the error ( in both meters and percent to 3 decimal places ) for the mean elevation determined using the GPS? Use the correct sign ( “+” or “ - ” ) to indicate the error direction (e.g., if the GPS value > DEM value, the error is positive). Show the equation(s) used. 5. Project your DEM grid and XY point to the State Plane Coordinate (SPC) System for San Diego: NAD 1983 (Meters), CA, Zone VI. Before doing the projections, answer these questions in your Word file: Is the DEM file vector or raster data? Is the XY point vector or raster data? Why is it important to understand your data before projecting it? a. The Projection Tools are found in “ Tool s” which is on the Analysis tab of the ribbon in the “Geoprocessing” pane . There are different tools for projecting vector data and raster data since projecting raster data requires resampling. Refer to the lab notes for additional instructions on using Projection Tools. i. For Raster Data: Analysis tab → Geoprocessing Group → Tools → in Geoprocessing pane on right side of screen, select Toolboxes → expand Data Management Tools → expand Projections and Transformations → expand Raster → Project Raster . The Project Raster tool will open on the left side of the screen. ii. For Vector Data: Analysis tab → Geoprocessing Group → Tools → in Geoprocessing pane on right side of screen, select Toolboxes → expand Data Management Tools → expand Projections and Transformations → Project . The Project tool will open on the left side of the screen. b. Name your output files the same as the inputs with “_SPC” appended (for State Plane Coordinates). Put the files in your Lab 3 mapdata folder on your USB drive with your other map data. ( Do NOT accept the default folder and filename. Click on the folder icon to the right of the field and browse to the correct folder.) c. For the Output Coordinate System, choose the Projected Coordinate System specified above (NAD_1983_StatePlane_California_VI_FIPS_0406) . Click on the icon top the right of the field to select the coordinate system. d. For Raster Data, you must choose the appropriate resampling technique (refer to lecture notes).

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CIVE 220 4 SDSU Homework 3 Instructions Fall 2023 6. Once you project your raster grid, create a Layout View in ArcGIS Pro showing only your new projected DEM grid (turn off all other layers and zoom to your projected DEM): a. Page orientation: Select 8.5″x11″ paper size in Portrait orientation. (Insert tab → New Layout → ANSI - Portrait Letter) b. Add a map frame. (Insert tab → Map Frame → select Map Source View). Use cursor to click and drag from the desired upper left and lower right corners of the map frame such that the left and right margins are small and the top and bottom margins are approximately 1 inch. You can resize the map frame by dragging the grips if desired. c. Insert the standard heading centered at the top (Insert tab → Graphics and Text group → Select the Rectangle Text tool). Draw a rectangle above your map frame and then type the standard heading. Format the font to be Tahoma, 14 pt size, and centered. (Text tab → Text Symbol group). d. Insert a North Arrow – ArcGIS North 2 – in lower left corner. e. Insert Hollow Scale Bar 1 Metric with units of kilometers in the lower right corner. f. Move and resize elements within the layout window to best display the content. g. Create a screen capture (PrtScr) showing your layout. Your filename (using the standard CIVE220 file naming convention) must appear at the top of your screen shot and the date and time at the bottom right. Paste the image in your Word file. 7. Turn off the DEM layer. Turn on your projected XY point, the World Topographic Map, and World Hillshade layers (make sure you can see the point clearly; increase the size or change the color if needed). Create another screen capture (including standard filename and date/time) of your layout and paste the image in your Word file. Answer the following questions in your Word file: (Hint: Questions 8 through 13 can be answered using information found in the Layer Properties dialog box (to open, right click on the layer in the Contents pane, and choose “Properties”) 8. What is the coordinate system (spatial reference) and linear units of the DEM you were provided? If there are no linear units provided, explain why. 9. What is the coordinate system (spatial reference) and linear units of the projected DEM? 10. What are the coordinate system parameters (projection, linear unit, central meridian, and standard parallel 1) for the projected GPS point file? 11. How many rows and columns are in your original and projected DEM grids? 12. What is the mean elevation for your original and projected DEM grids? Display answer with 3 decimal places and be sure to include units. Why are these values different? 13. When you projected your DEM, did you use Nearest Neighbor or Bilinear Interpolation resampling? Explain why. 14. Save all work and submit your Word file on Canvas.

Lab_3_Instructions

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