Hi Maxwell,
> I am using the ContourGenerator transformer to try and create some
> contour line shape files from NED Dems. Everything works fine, except
> when I do 2 adjacent dems the output shape files have a small gap in
> the contours where the dems are touching. If I combine the dems the
> gap goes away, but the problem is I have probably 2-3 hundred dems and
> combining all of them would be too large. Is there something I am
> missing here or does anyone know why or where this gap is coming from?
Unfortunately this is the way the ContourGenerator works. When it builds
a terrain model, it can obviously only take in account the data it has
read at that moment. It does not know anything about any adjacent DEM's
if they're not part of that same translation run.
What you could try is:
- Combine the DEM's into larger chunks (less gaps)
- Run a Snapper over the resulting contour lines, make sure to set it to
group by the elevation value. You'll probabely have to experiment a bit
to get the right tolerance.
- When processing one DEM, read in the adjacent ones and clip a tiny
slice off of it. Say your original DEM bounding box + 5% or so. Then
clip to the original DEM bounding box. You'll still want to run a
Snapper over the result though, just in case. Also, it would increase
processing time.
Hope this helps.
--
Hans van der Maarel
Red Geographics
www.redgeographics.com / [EMAIL PROTECTED]
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