1.7. Search for Digital Elevation Model (DEM) - Topography of the Site

  1. Go to nationalmap, in the search bar at the map view search for “university of pennsylvania”.



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  2. In the Datasets window, go to Elevation Products (3DEP) -> 1 arc-second DEM -> GeoTIFF. Click on “Search Products”

    a. 1 arc second (approximately 30 meters), 1/3 arc second (approximately 10 meters), and 1/9 arc second (approximately 3 meters) read more about it here.



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  3. You can see the results here. Click on Footprint and you can see the extent of the data. Download the data.



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  4. Import the .tif file into QGIS (Import Raster Layer).



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  5. Lets reproject the raster image to the right CRS. Follow the steps in the exercise “Projecting the Maps: From Lat/Lon to Metres” Step 1-6.

  6. Clip the raster image to only show the our extent of interest (Clip Raster). Use the circle drawn in the exercise “Land Use Map” Step 15 to clip it.



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