I've had some luck at figuring out how to convert DXF files into vector data within Grass but I'm running into a problem. The CAD designer that generated these DXF files used horizontal and vertical lines to create large grids. Visually, the lines form a multitude of squares and rectangles, but the intersections are not defined at the vector level. That is, they were not drawn as closed polygons, so v.in.dxf doesn't yield any areas.
I'd like each of the "polygons" created by the grid lines to become a vector area, but haven't yet found a clever way to do it. For now, I'm simply creating a raster with the vector data, pulling it back in with r.in.gdal and subsequently using "r.to.vect feature=area" to find the closed polygons.
Is there a way that I can go about this purely within the vector space? I'd like to skip the lossy raster conversion step. Thanks for the help.
The CAD designer that
generated these DXF files used horizontal and vertical lines to create
large grids. Visually, the lines form a multitude of squares and
rectangles, but the intersections are not defined at the vector level.
That is, they were not drawn as closed polygons, so v.in.dxf doesn't
yield any areas.
I'd like each of the "polygons" created by the grid lines to become a
vector area, but haven't yet found a clever way to do it. For now, I'm
simply creating a raster with the vector data, pulling it back in with
r.in.gdal and subsequently using "r.to.vect feature=area" to find the
closed polygons.
Is there a way that I can go about this purely within the vector space?
On Dec 31, 2007 1:37 PM, Maciej Sieczka <tutey@o2.pl> wrote:
gary wrote:
> I'm doing an install of grass62. I'm a bit confused about this new
> program gdal-grass.
It exists for some years now
> Yes, I know google is my friend, but I don't really follow this
> explanation:
> http://osdir.com/ml/gis.gdal.devel/2005-02/msg00049.html
>
> Incidentally, I've already compiled proj-4, geos, gdal, and grass62. I'm
> not sure how to set up the ./configure for gdal-grass.
I have tried pointing to where:
1) the tarball was extracted
2) the directory lib, contained in the directory where the tarball was extracted
3) a directory called grass-6.2.3, which was created in /usr/local
4) the directory lib in the above directory
That is:
1) /usr/local/src/grass/grass-6.2.3
2) /usr/local/src/grass/grass-6.2.3/lib
3) /usr/local/grass-6.2.3
4) /usr/local/grass-6.2.3/lib
The error message is
configuration error --with-grass= blah blah blah libraries not found
Maciej Sieczka wrote:
gary wrote:
Is this supposed to point to where I extract the grass tarball?
this may help you. It compiles and installs the plugin right away from
the GDAL source code, you don't even have to download the
separate plugin code (which is really just taken from the GDAL
source code).
Maybe that helps,
Markus
On Jan 1, 2008 9:49 PM, gary <lists@lazygranch.com> wrote:
I have tried pointing to where:
1) the tarball was extracted
2) the directory lib, contained in the directory where the tarball was
extracted
3) a directory called grass-6.2.3, which was created in /usr/local
4) the directory lib in the above directory
That is:
1) /usr/local/src/grass/grass-6.2.3
2) /usr/local/src/grass/grass-6.2.3/lib
3) /usr/local/grass-6.2.3
4) /usr/local/grass-6.2.3/lib
The error message is
configuration error --with-grass= blah blah blah libraries not found
Maciej Sieczka wrote:
> gary wrote:
>> Is this supposed to point to where I extract the grass tarball?
>
> Yes. Eg. --with-grass=/usr/local/grass-6.3.svn
>
> Maciek
>
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Well, different errors. I assume you wanted that file in the gdal-grass directory as created by tar, which in my case is
/usr/local/src/gdal-grass/gdal-grass-1.4.3
I "sourced" the file. Error message is --with-grass=/root/grass63/dist.x86_64-unknown-linux-gnu
this may help you. It compiles and installs the plugin right away from
the GDAL source code, you don't even have to download the
separate plugin code (which is really just taken from the GDAL
source code).
Maybe that helps,
Markus
On Jan 1, 2008 9:49 PM, gary <lists@lazygranch.com> wrote:
I have tried pointing to where:
1) the tarball was extracted
2) the directory lib, contained in the directory where the tarball was
extracted
3) a directory called grass-6.2.3, which was created in /usr/local
4) the directory lib in the above directory
That is:
1) /usr/local/src/grass/grass-6.2.3
2) /usr/local/src/grass/grass-6.2.3/lib
3) /usr/local/grass-6.2.3
4) /usr/local/grass-6.2.3/lib
The error message is
configuration error --with-grass= blah blah blah libraries not found
Maciej Sieczka wrote:
gary wrote:
Is this supposed to point to where I extract the grass tarball?
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