I have two shapefiles that I imported into GRASS 6.4.5 using v.in.ogr. One is
a polygon file of building footprints. The second is a polyline of the
pavement edges of urban streets. I am trying to convert this into street area.
I used v.clean, v.type (to switch from line to boundaries), and v.centroids.
This conversion process gives me street areas but also creates doughnut holes
corresponding to the area inside of a city block outlined by the streets. For
the most part the doughnut holes contain buildings, so I am trying to use
v.select to select the areas that do not contain buildings. I have not been
able to get anything besides "overlap" to work. Overlap is not good enough
though because many of the buildings have shared nodes with the streets, for
example where a driveway runs along one side of a house. I checked and my
version of GRASS was compiled with the following GEOS details:
--with-geos=/Library/Frameworks/GEOS.framework/Versions/3/unix/bin/geos-config
Below is an example of an error that I am getting when I try anything besides
overlap:
v.select --overwrite ainput=EdgePav_cent@PERMANENT binput=Bldg@PERMANENT
output=Pav_sel operator=containsWARNING: Vector map <Pav_sel> already exists
and will be overwrittenBuilding spatial index...Processing features...ERROR:
IllegalArgumentException: point array must contain 0 or >1 elements A similar
question appears to have previously gone unanswered:grass-development-gis -
[GRASS-dev] v.select - ERROR: IllegalArgumentException: point array must
contain 0 or >1 elements - msg#00289 - Recent Discussion OSDir.com
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| grass-development-gis - [GRASS-dev] v.select - ERROR:
IllegalArgumentException: point array mus...hi, I've tried v.select of a line
vector by an area vector: GEOS-based selection v.select
ainput=geav150@rstreamanalysis binput=mgoutlet@rstreamanalysis output=test
operator=overlaps |
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Thanks for any advice you can provide.
-Thayer
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