Geographic Reference System
The Missouri Geographic Reference System is a network of accurately positioned Horizontal and Vertical control monuments (latitude, longitude, elevation and state plane coordinates) used by land surveyors, engineers, cartographers and others who have a need to locate positions on, below or above the surface of the earth.
To access the Geographic Reference System stations by County, click on the map below. Each county map has a graphical representation of the position of the Horizontal and Vertical Control Stations found in the county. Please visit the Horizontal and Vertical Control Index page for a comprehensive list of the stations available in each county.
