Cadastral Survey



BLM Cadastral Surveyors originally used geodetic-grade GPS receivers to do control surveys for field work.  This greatly improved the accuracy of the control surveys and decreased the time needed in the field to complete surveys. 

The collection of this data also assisted in improving the spacial accuracy of the data collected for the Geographic Coordinate Data Base.


Cadastral Surveyors currently use the static method of data collecting to do control surveys in areas with a canopy or in narrow canyons.

Real Time Kinematic (RTK) methods of collecting data are also used to do entire surveys in areas that do not have canopy. This has allowed the reduction in size of survey crews.

Control is also established for users of Light Detection and Ranging (LIDAR), photogrammetry, and resource grade receivers to locate and map a wide variety of features. Some of the many different types of sites located are:

Archaeological and Historical Sites
→Native Camp Sites
→The Oregon Trail

Vegetation Study Areas

Geological Sites

Fire Boundaries

The Idaho GPS Data Dictionaries have been added.


A program contained in will convert a GCDB line file to a coordinate file that can be uploaded to a Rockwell PLGR or Trimble GPS receiver.