Raster to Vector Conversion
Mat L. Gilson
mlg at sscgis.or.gov
Mon Jan 16 20:46:22 EST 1995
scott> I've just downloaded the Linux Binaries for GRASS hoping to find a
scott> utility which can convert a raster image to a dxf file. I have 20
scott> source files which are 5100x3300 bitmaps in targa format. The
scott> bitmaps are scans of floor plans which I need to convert to dxf for
scott> import into AutoCAD. Is this something GRASS can do? If so, are
scott> there pitfalls? Is the output quality high?
scott> email: srouten at antimony.service.indiana.edu
Some state agencies in Oregon are using a Linux port of the raster-to-
vector program LTPlus. I personally haven't used the Linux version,
but I have experience with the Forest Service' SCO version. I know
LTPlus can export dxf's, and I am fairly certain it imports
targa's. It is necessary to do some manual editing of the raster
before vectorizing, such as tight-angle intersections where the raster
lines globbed together. The process it reasonably quick overall, and
I hear that the Linux port generally runs faster than the SCO version.
I found the output line accuracy to be good, but you do sometimes
see raster artifacts. Those can usually be erradicated with touch-up
editing and vertex thinning.
The company with the Linux port is Flat Earth System in Portland, OR.
They can be reached at (503) 257-9042 or by e-mail at danh at teleport.com.
Mathew Gilson mlg at sscgis.state.or.gov
OR Dept of Admin Services voice: (503) 378-5996
State Service Center for GIS fax: (503) 986-3242
--Opinions are mine, etc....
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