|
|
| GeoCommunity Mailing List |
| |
| Mailing List Archives |
| Subject: | [gislist] How DEM accuracy affects horizontal accuracy Orthos |
| Date: |
12/22/2005 10:35:02 AM |
| From: |
Lawrence Hartpence |
|
|
Hello,
Our county just received new digital aerials. We have been doing various
checks to assure good accuracy and appearance. We checked the DEM with our
high accuracy monuments and found 66% of the points checked were accurate to
2ft or better, 7% were only accurate to 20ft or worse with the worst being
off by almost 60ft.
I have been told that the vertical accuracy of the DEM has no bearing on the
horizontal accuracy of the Orthos. Is this really true? Are these
accuracies good enough to produce Orthos that are supposed to meet National
Map Accuracy Standards for 1" = 200' scale?
Lawrence Hartpence
GIS Coordinator
101 1st St N
Newton IA 50208
641-792-3084
hartpence_gis@co.jasper.ia.us
_______________________________________________
gislist mailing list
gislist@lists.geocomm.com
http://lists.geocomm.com/mailman/listinfo/gislist
_________________________________
This list is brought to you by
The GeoCommunity
http://www.geocomm.com/
|
|
Sponsored by:
For information
regarding
advertising rates
Click Here!
|
