J. Hartzheim, PE, is a DOT program manager – geodesist at the Wisconsin
Department of Transportation (WisDOT). He is program manager for the state’s
CORS and height modernization programs. Hartzheim conducted his first GPS
survey in 1984.
For the past several years, surveyors in Wisconsin have kept pace with the national trend toward increased use of GNSS for survey positioning. Wisconsin surveyors started adopting GPS technology in the mid-1980s, and the practice has been growing ever since.