The move is highly controversial. Some fear the map would serve as a database and could be quickly transformed into a tool for isolating areas or even population relocation (ala President Franklin Roosevelt's Executive Order 9066 which interned over 100,000 Americans of Japanese descent as well as thousands of Americans of German and Italian descent into concentration camps).
Geographical mapping of groups is a very touchy issue. While doing college reports on ethnic groups of Europe, I discovered countries like France and Germany explicitly forbid the government from classifying and mapping people by race or religion. Though racial geospatial data has been available for a while in the United States, it has been used mostly in economic studies. Expect the judicial system to become involved with warfare becoming a domestic demographic geospatial matter.