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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Creating a Surface. |
| Date: |
08/14/2001 02:52:36 PM |
| From: |
ðÅÔÒ ûÁÒÙÊ |
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Edward,
What is the final surface presentation you want to have?
If only triangulated irregular network, when there may be a lot of reasons (e.g., methods used rounded values).
If this is a grid, when you will never obtain exact measured values, because you measured elevations not in grid points. Nevertheless, methods based on Delauney triangulation are usually better in survey points than geostatistical ones (kriging) that normally change elevations. I use Delauney in such cases.
Finally, ESRI shapefile description contains a special structure termed 'surface' that should avoid such errors, but I have no experience with it.
May be, this helps you.
Regards,
Peter Shary
http://members.fortunecity.com/eco4/giseco/
>List,
> I am trying to create a tin from survey cross-section data to use in
hdrologic modeling. The problem is when I create the surface I am getting a
error in some places of over a foot. I have Spatial and 3d Analyst and have
tried different methods but I am unable to get the accuracy of the survey
data into my tin. I am wanting the elevation to be exactly the same at the
point were the survey shot was taken. Is there a method that I am missing?
Any help would be greatly appreciated. ave a good day.
>
>Edward G. Copeland
>GIS Specialist
>Austin, Texas 78701
>Phone: 512.457.7804
>Fax: 512.472.7519
>
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