![]() ![]() ![]() This step helps reduce the size of the terrain model and subsequent GIS processing time. Clip the projected terrain raster with the Clip (Data Management) tool, using the buffered boundary shapefile from the previous step.Buffer the area of interest by two miles to avoid edge effects within the area of interest and save the buffered shapefile in Buffer (Analysis) tool.Select ‘ yes ’ to add the data as a layer.Check the box next to Use the same coordinate system as: ' this layer's source data'.Right click on the layer and select Data => Export Data (Selected features) from the dropdown menu.With the ‘ Select ’ tool, select the watershed of interest (East Branch Brandywine Creek in this example) from the WBDHU10 watershed boundary shapefile that was downloaded from the USGS National Map Viewer.This shapefile will be u sed as a boundary to clip the terrain raster in the next step.Create and buffer a shapefile that encompasses the area of interest.use the modified USA Albers Equal Area Conic USGS Version projection ( SGH_c) that you added to Favorites in the last step. Specify the same projection and settings as the elevation/terrain raster, e.g.Use the Project (Data Management) tool to p roject the watershed boundary shapefile to the same CRS as the terrain data.Select the saved projection as the ' Output Coordinate System ' from Favorites. Right click on the new copy to ‘ Add to Favorites ’. ![]() Right click on the chosen projection and select ' Copy and Modify' to save a copy of the projection named SHG_c ( Standard Hydrologic Grid) in this example.ĭouble click on the new copy, change Linear Units to foot_US and click ‘ Ok ’. In Project Raster (Data Management) tool: You can change the units in the raster projection to feet if desired. Import terrain and watershed boundary data from previous steps (HUC-10 level shapefile used in this example) to your project with Add data menu.ĭo NOT use an unprojected CRS, such as Geographic. It is helpful to save the map in the same folder as the rest of the project data.
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