Which is the best projected coordinate system for the whole Nigeria in order to use the Euclidean Distance Spatial Analyst (to calculate distance to polygons over the whole country)?
There's no projection that will not distort any distances. You can try to minimize the problem with a custom coordinate system. One possibility is to use a custom azimuthal equidistant. Distances measured from the center point are good. If you using multiple start points, center it in the middle of the country. If the start points are mostly at the coast or a particular city, put the center there instead.
There's no projection that will not distort any distances. You can try to minimize the problem with a custom coordinate system. One possibility is to use a custom azimuthal equidistant. Distances measured from the center point are good. If you using multiple start points, center it in the middle of the country. If the start points are mostly at the coast or a particular city, put the center there instead.
