Thanks Hamish - This Worked Great.
Hey, while I am writing, can you recommend any GRASS methods for
cleaning line feature
topology, besides v.clean? I am trying to repair a lot of missed
connections in the USGS
NHP2 stream network data so that I can accurately compute stream
distances with v.net.path.
At this point I may be forced to resort to Arc GIS Network Analyst to
diagnose the problems,
but would MUCH rather use the GRASS tools.
A final question: Is anyone aware of a version of the NHP stream dataset
that HAS been
cleaned and repaired to support distance calculations? This would not be
a trivial task,
even for portions of the dataset.
Thanks,
Rick R
Hamish wrote:
Rick Reeves wrote:
I'm using v.in.ogr to clip a polygon set (in this case, county
boundaries) to the boundary of a (rectangular) raster image.
As far as I know, this is the only way to do this; I tried to
create a new location with the same boundaries and import the
polygon shapefile into the location, but clipping did not occur
as expected.
In any case, v.in.ogr did not clip the 'boundary polygons' to the
the edge of the raster image, but included the entire polygon.
Only excluded polygons completely outside of the bounding box
are clipped.
Hamish:
I assume you used 'v.in.ogr spatial='. This works like v.select.
R:
There MUST be a way to clip all polygons to the bounding box edge.
Can any one suggest a way?
H:
v.in.region + v.overlay.
Moritz Lennert wrote:
Or v.in.region + v.select if you don't wan't to merge attribute
tables.
v.select will act the same way as 'v.in.ogr spatial=' (or a personal
favourite: 'v.in.ogr -r') which was what the original question was
hoping to avoid. ie v.select leaves features in or out, while v.overlay
both allows or omits features AND modifies any features which cross.
Hamish
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begin:vcard
fn:Rick Reeves
n:Reeves;Rick
org:UC Santa Barbara;National Center For Ecological Analysis and Synthesis
adr:Suite 300;;735 State Street;Santa Barbara;CA;93101;USA
email;internet:[EMAIL PROTECTED]
title:Rick Reeves, Scientific Programmer/Analyst
tel;work:805 892 2533
url:http://www.nceas.ucsb.edu
version:2.1
end:vcard
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