I have been attempting to convert a
vector area layer to a raster layer using
v.to.rast. The problem I am having is
that the vector layer contains a polygon
that is wholly encloses by another
polygon. When executing a d.what.vect,
the proper attribute value is returned
for this lake. However, after the
conversion, the raster layer has "no
data" for the lake. Is this a known
problem with v.to.rast? I have checked
for overlapping areas and there are none.
I was able to circumvent the problem by
importing the lake separately and doing
an r.patch. This seems like a roundabout
way of doing it. Any comments would be
appreciated.John Sparco
First, in v.digit, make sure that the attribute point for the outer area is not
located within the inner "lake". If that looks ok, I'd suggest running v.support
on the file again, and then running v.to.rast one more time to test it. Data
"islands" in vector files tend to cause grief if they haven't had topology
rebuilt after doing *anything* to the file!! Let me know if this works for you.
Regards,
--
Malcolm D. Williamson - Research Assistant E-mail: malcolm@cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-6159
Ozark Rm. 12 Fax: (501) 575-3846
University of Arkansas
Fayetteville, AR 72701