[GRASSLIST:4993] Re: US Census boundary file problem
blazek at itc.it
Tue Nov 19 04:37:36 EST 2002
On Monday 18 November 2002 10:44 pm, Michael Ash wrote:
> Using d.what.vect and moving due east from northern New
> Mexico, U.S.A., I find New Mexico, Nothing where Texas
> Should Be, and Oklahoma:
> I think that the problem is an unclosed area.
I was curious where the problem is and I found dangle on the boundary:
For next occasions and others:
m.in.e00 input=st99_d00.e00 action=vector
v.support -r map=st99_d00 err=err
v.out.ascii input=err output=err
and it is also in st99_d00.e00:
2094 12234 2039 2040 196 196 2
so the problem is in st99_d00.e00. I think that such dangles are
allowed in Arc/Info, but as it is not present in st99_d00.shp.
I consider it to be an error in data. You can write to census.gov.
v.rm.dangles input=st99_d00 output=us
cp dig_att/st99_d00 dig_att/us
cp dig_cats/st99_d00.name dig_cats/us
v.support -r map=us
us in us Area - Category 196 Texas
More information about the grass-user