National Spatial Reference System
The National Spatial Reference System, managed by the National Geodetic Survey, is a coordinate system that includes latitude, longitude, elevation, and other values. The NSRS consists of a National Shoreline, the National CORS, a network of permanently marked points, and a set of models that describe dynamic geophysical processes affecting spatial measurements.
In 2022, the NSRS will be modernized and use the following four frames of reference:
