Skip to main content

GPS on Bench Marks

GPS on Bench Marks is the National Geodetic Survey's crowdsourcing approach to obtaining survey-grade GPS data on a prioritized list of marks where new data will provide the most benefit. Surveyors, engineers and technicians that work for Federal and State government agencies, universities, professional societies, and private sector firms use their GPS equipment to take measurements on survey marks in the areas where they work and share them with NGS via our online tools. The public can also participate by finding the survey marks on the priority list and reporting back to NGS on their condition and suitability for GPS observations. This crowd-sourced data helps to improve the local accuracy of national scale models and tools that NGS builds to serve the Nation.

Project URL:

Geographic Scope: GPS data are collected at thousands of geodetic control mark locations across the USA, and are then shared via on-line forms. Location lists can be generated via search at

Project Status: Active - recruiting volunteers

Participation Tasks: Finding entities, Geolocation, Measurement, Observation,

Start Date: 01/01/2014

Project Contact:

Federal Government Sponsor:

NOAA logo

Other Federal Government Sponsor:

Fields of Science: Computers and technology, Geography, Geology and earth science, Nature and outdoors

Intended Outcomes: The GPSonBM Program is designed to prepare communities across the country to take full advantage of the many benefits of the Modernized National Spatial Refence System when it is released.