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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: determining DEM accuracy or error |
| Date: |
03/31/2003 12:00:01 PM |
| From: |
northms .. telus.net |
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Hi there,
Can anyone give suggestions about how to report accuracy of a DEM and
measurement derived from a DEM?
I have one DEM each for the same study area in two separate years. In each
case, one-metre contours and additional planimetric data were used to build a
TIN elevation model. The TIN's were converted to grid-type DEM's with two-
metre cell size. The two surfaces were compared by subtracting the year1 DEM
from the year2 DEM.
How do I go about estimating the accuracy (or error) of each DEM, and the
accuracy of difference measurements taken from the two DEM's (i.e., year2 -
year1)? Can anyone suggest methodology or references to help with this?
thanks,
sarah
email. northms@telus.net
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