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Civic hacking National Geodetic Survey survey marks

Building a survey mark finder app.

By Luke Fretwell · December 30, 2022

(This post is part of an ongoing series documenting adventures in father-son civic hacking.)


We built a survey mark finder app from data provided by the National Geodetic Survey. This includes:

  • List of survey marks across the United States
  • Pinpoint to current location
  • Search survey marks in any location
  • Survey mark recovery submission


Data used for this project:


Big kudos to NGS for:

  • Providing public data sets.
  • Creating a public submission recovery form.


GeoMarks app:

Screenshot of USA.GovFresh space photo of the day page


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