4.2.9. GIS overlay function to produce final output
We overlaid individual layers at different levels to produce a final
output map of urban land-cover classes. The first GIS overlay function
started with the last two layers. This was mainly to add lakes/ponds
generated by the membership function to the last output map. Hence,
a priority is given to water bodies identified with the membership
function when intersecting the water output with the last output
generated by the nearest neighbor classifier. In other words, all water
pixels identified in the first layer that intersect with any other classes