I have moved a series of dxf files into grass with the new v.in.dxf. However, I have discovered that the original dxf files were not georectified. They came from some sort of xy location system. I have been thinking about ways to rectify the grass vectors I created. The only ideas I have come up with would involve writing the new grass vectors out with v.out.ascii, developing a "correction factor", applying the correction to the ascii files, then reading the ascii files back into grass with v.in.ascii.
I have moved a series of dxf files into grass with the new v.in.dxf.
However, I have discovered that the original dxf files were not
georectified. They came from some sort of xy location system. I have
been thinking about ways to rectify the grass vectors I created. The
only ideas I have come up with would involve writing the new grass
vectors out with v.out.ascii, developing a "correction factor",
applying the correction to the ascii files, then reading the ascii
files back into grass with v.in.ascii.
Does anyone know of less cumbersome approach?
Hi Kirk,
It is typical for DXF data to be unprojected. Use v.transform.
for something more interactive you might try some mix of {v.to.rast +
i.vpoints + analyze the group/POINTS file} to get the v.transform
parameters, or try Michael's new GeoRectifing tool (gis.m
File->GeoRectify)?