Precision and Accuracy in Geolocation
Creators:
Tom Elliott
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Last modified
Feb 11, 2013 02:06 PM
Information about the horizontal accuracy and precision of Pleiades location content.
Precision and accuracy in major datasets incorporated in Pleiades
Precision of Barrington Atlas coordinates
Sources of error
- Base map precision: 1/50"
- Mylar registration: 1/50"
- Feature placement: 1/30"
Sum: 0.073333"
Precision is dependent on map scale, and the Barrington Atlas incorporated maps at 4 different scales. Nominal precision for each scale is as follows:
- Maps at 1:250,000: 465m
- Maps at 1:500,000: 930m
- Maps at 1:1,000,000: 1860m
- Maps at 1:5,000,000: 9310m
Precision of DARMC coordinates
(to be added)
Discussion of precision and accuracy for coordinates added through the web
(to be added; e.g., locations verified in Google Earth)