| Subject: |
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Re: vertical accuracy in the US |
| Name: |
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Dean Gesch |
| Date Posted: |
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Mar 13, 08 - 11:34 AM |
| Email: |
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gesch@usgs.gov |
| Message: |
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16 m is the SRTM mission specification, which is expressed at the 90% confidence level. 9.73 m is the vertical RMSE, which is the equivalent of 16 m at 90% confidence. 3.53 m is the measured vertical RMSE vs. GPS control points from NGS (http://www.ngs.noaa.gov/GEOID/GPSonBM03/index.html). The bottom line is that in a test of SRTM data over the conterminous U.S. against geodetic control points, the SRTM exhibits a vertical accuracy that is better than the mission specification.
The techniques to translate among the various metrics used to describe vertical accuracy are documented in:
MAUNE, D.F.; MAITRA, J.B., and MCKAY, E.J., 2007. Accuracy standards & guidelines. In: MAUNE, D. (ed.), Digital Elevation Model Technologies and Applications: The DEM Users Manual, 2nd Edition. Bethesda, Maryland: American Society for Photogrammetry and Remote Sensing, pp. 65-97. |
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