[GRASS-user] Patching large numbers of vectors

[Richard Chirgwin]

Hi,

There seems to be a problem in handling of large numbers of vectors.

I had a large number of buffered points to put together. The buffer
areas (with centroids added) were constrained by non-overlapping areas
to avoid errors later, after which I wanted to patch them together into
a single file. I used:

for i in `g.mlist vect pattern="Centroids*"`; do
v.patch -a -e input=$i output=patchfile --overwrite;
done

to do this.

For most vectors, everything works fine, but every now and again, the
patching process would report a problem (something like "error bug sidx
topo", it goes by in a flash and I haven't been able to work out how to
log the script outputs) with an individual vector. If, however, I
patched the vector manually (outside the script), it would work fine.

I suspect that because of the speed and huge number of vectors I'm
trying to put together, v.patch is having trouble finding the sidx file,
but really, I have no idea. Any thoughts?

Richard Chirgwin