I can't help with the banding, I think that's just losuy DEMs, but I was
able to clean up the seams. I forget the exact steps but I think this
should get you started.
Splice all the DEMs you need to use into a single VM grid, and then resize
the grid to a much larger cell size. (Maybe 3 or 4 times as large). This
got rid of my seams, or borders. Then "stamp" the merged original grid onto
the resized grid. This will fill in the gaps around the borders with the
resized valuse, while preserving the quality of the original DEMs.
Good luck,
Rich
At 09:58 AM 8/8/2000 PDT, you wrote:
> Hi list, my current problem : ) lies in the realm of DEMs. As my luck
>would have it the project I am working on is centered right at the
>intersection of 4 quads. I am using 1:24000, 7.5' USGS DEMs (SDTS format).
>The problem appears when I proceed to merge the DEMs. Some of them leave
>unsightly borders from one to the next while others are nearly seamless.
>After applying relief shading to the merged file, the ones with the poorly
>aligned edges contain dark bands running horizontally across the image.
>However, the ones that lined up seamlessly shade very nicely.
>
>At first I thought that perhaps the banded DEMs were in feet as they were
>in areas of lower relief but they turned out to be in meters as well. I
>would like to use the 1:24000 DEMs in my project as the 1 Degree DEMs are a
>bit too small scale. If anyone has any hints or fixes or experience with
>this, please email me..also..we are using MapInfo 5.5 and Vertical Mapper
>2.1.1 Thanks for your time and suggestions! Sincerely,
>Jacob Bunt
>[EMAIL PROTECTED]
>
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Richard W. Greenwood, PLS
Greenwood Mapping, Inc.
[EMAIL PROTECTED]
(307) 733-0203 fax: 733-4018
http://www.GreenwoodMap.com
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