The easiest way to carry out a proximity analysis using rasters is GDAL's Proximity tool in QGIS. The tool requires a raster layer where features are described by cell values greater than zero. It takes the input raster, and creates the proximity grid--a raster with the same extent and resolution filled with distances from cells with values greater than zero. The behavior of the Proximity tool implies the following two things:
- We need to rasterize our input features
- We need to supply our rasterized features in a raster map covering our study area
As we've already found out, we can supply an existing raster layer to the Rasterize tool:
- Select one of the factor inputs (like waterways, mean_coordinates, and ...
