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Ground truth has several possible meanings:
- “Ground truth” is a phrase used in cartography and sometimes within the OpenStreetMap community (where it is better known as "truth on the ground" or "TotG"), to mean collecting data on the ground, on location. More specifically it can refer to doing this in order to get reference points for positioning aerial imagery data (or data traced from it). You might describe this as "ground truthing" the data. See also Good practice#Map what's on the ground, quality assurance and accuracy. See Wikipedia's article.
- GroundTruth is a software tool for Windows (.NET) to produce maps for Garmin GPS devices.
- GroundTruth Initiative (groundtruth.in) is a small technology consulting company directed by Mikel Maron and Erica Hagen, working on OpenStreetMap mapping and citizen journalism projects in poor and marginalized regions throughout the world, such as mapkibera.org.
- “Ground truth” is also some kind of internal codename for mapping party ideas by the Google Map Maker team.