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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] GIS Survey Question |
| Date: |
01/26/2004 09:35:01 AM |
| From: |
Layne Seely |
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hey Jonathan:
=20
The site is a small island that we do not expect to have much in the way =
or relief. I understand that I can take fewer postings on primarily level =
ground and concentrate postings around/within areas of relief. In =
addition to getting an idea of postings placement, I'm trying to figure =
out how long this will take.
=20
Thanks for the reply.
=20
Layne
>>> "JONATHAN BYRON" <JBYRON@ci.st-augustine.fl.us> 01/26/04 09:21AM >>>
Not sure if there is a rule of thumb that can be used on all terrains with =
mathematical precision. If the area is very flat / homogenous (Everglades,=
playa lake regions, etc) , then points could be widely spaced and the =
accuracy would be good. If the surface is complicated with high relief =
(many steep scarps or cliffs), even "closely" spaced points would lead to =
contours that don't fit the ground truth very closely. Any idea what the =
fractal dimension of your Yucatan surface is? Disclaimer: I am not a =
surveyor.=20
Jonathan=20
>>> "Layne Seely" <LSEELY@cpyi.com> 01/26/04 09:28AM >>>
hey Group:
I have been tasked with planning and performing a land survey to generate =
contours for a project. We will be using the Leica SR530 to collect point =
data to support the creation of 6" contours. The site may have as much as =
10' total elevation above sea level (it's near the Yucatan peninsula :))
What I need to know is how closely I need to plan my points to warrant 6" =
contours. From what I know of Lidar, you plan 2.5m postings to generate =
2' contours. If my math is correct, I will need to collect a posting =
every 2'.
Is this basically correct?
Mr. Layne Seely
GIS Analyst
CHIANG, PATEL & YERBY, INC.
1820 Regal Row, Suite 200
Dallas, Texas 75235
214.640.1736 (Direct)
214.638.3723 (Fax)
LSeely@cpyi.com=20
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