Mapping Control

Data and Documentation

Mapping Control consists of monumented points and coordinate positions, referenced to the National Spatial Reference System (NSRS), which serve as the spatial reference framework for the alignment of almost all spatial data and for other mapping purposes. Mapping Control data for Montana is stored in the Multi-state Control Point Database (MCPD)—a database of coordinate points that enable accuracy enhancement for other vertically aligned datasets. The MCPD contains points for the Idaho as well. Multi-State Control Point (MCPD) Database

Contribute to the Multi-State Coordinate Database (MCPD). The MCPD is a database of geodetic and mapping control covering Idaho and Montana. Points are submitted by registered land surveyors. Control are tied to the National Spatial Reference System (NSRS), however they are not part of the NGS database nor are they part of the CORS network. MCPD Data Submission Spreadsheet

The “Bluebooking” adjustment process for GPS projects has been revised and is now available to the public for evaluation and use. National Geodetic Survey (NGS) Blue Book


The public may use this site to search for and download survey and/or mapping control points that are unique to the Idaho and Montana data sets. For your convenience links to the National Geodetic Survey (NGS) control point data sheets and corner coordinates of the Public Land Survey System (PLSS) have been provided. MCPD Application


The Multi-State Control Point Database supports accurate horizontal and vertical placement of all other layers, particularly Cadastral (by improving horizontal locations), Hypsography (by providing accurate elevations from Height Modernization), Land Cover, Orthoimagery, Soils and Wetlands from a combined campaign to acquire LIDAR data or other Remote Sensing data collected with accurate positions and elevations provided by Height Modernization.