An overview of editing and data compilation

Compiling geographic information is the most costly and time consuming part of developing a GIS. The geographic information that is created is a valuable but time sensitive asset, so care and precision must be taken in its collection and maintenance. GIS data loses its value if it becomes out of date. The database must be updated to keep it current. Just as the owner of a parcel changes when it is sold, the geometry of the parcel feature itself may change if it is split for subdivisions. Even natural features change over time: the course of a river may change through meandering or by stream capture.