Data Input





hillshade image





In order to give spatial context to the urban extent data, a background image is incorporated into image output. This must be a grayscale image, and a hillshaded DEM (pictured here) is commonly used.

To give further definition to a region, bodies of water may also be represented. This occurs by any pixels in the background image whose values are zero (0) being filled with the WATER color defined in the scenario file. *Note: this will also mean that any heavily shaded locations that have a zero value will also be filled with the WATER color. This can be avoided by remapping any zero values in the hillshade image to one (1) before adding the water mask.

If WATER is defined as black (R,G,B = 0,0,0) zero value pixels will remain black in the output images.

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