4. Distance to Water Source Input - Derivation

Task 1: Convert NHD waterbodies to polyline (for distance to water input)

  • Step 1: Use the "Polygon to Line" command:

Output: 

  • NHD_Lakes_As_Polyline.shp
  • Step 2: Use the "Merge" command to combine the resulting lakes polyline with the NHD perennial streams include streams outside your project area.

 Output: NHD_Lakes_Perennial_Streams.shp

                                                                                                                                                                                                                             

Task 2: Use the Euclidean Distance command to calculate distance to water sources 

  • Step 1: Load the input layer, generated in the previous task: NHD_Lakes_Perennial_Streams
  • Step 2: Assign an output grid name

Output:

  •  NHD_Lakes_Streams_For Euclidean_Distance.img
  •  Step 3: Clip the output raster NHD_Lakes_Streams_For Euclidean_Distance.img by your area of interest.

Use "Extract by Mask":


Step 4: Convert to an ASCII raster using the "Raster to ASCII" command.


Your euclidean distance should look something like the above.

Output: 

  • Euclidean_Distance_to_Water.img
  • Euclidean_Distance_to_Water.asc
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