[GRASSLIST:1849] RE: trouble with TIGER data

GRASS GRASS user
1

Hello Ed,

v.in.tig.basic doesn't create a cats file. v.support creates topology
information. Please see
http://www.ecosconsult.com.br/grass-list/arq/8920.html
for an example of how to create a cats file. If you need
more information, let me know.

John

-----Original Message-----
From: Ed Davison [mailto:bfdi533@cbacc-security3.bus.utexas.edu]
Sent: Thursday, November 20, 2003 11:20 AM
To: grasslist
Subject: [GRASSLIST:1846] trouble with TIGER data

I have imported vector data from TIGER type 1 and type 2 files using
v.in.tig.basic. I then ran v.support on each map imported. But, when I
run d.what.vect GRASS complains that cats support is missing. I am
confused here as I thought that v.support was supposed to do this.

What am I missing here? What do I have to do to get the dig_cats files
build for these TIGER maps?

Ed

2

On Thu, 2003-11-20 at 13:13, John Gillette wrote:

Hello Ed,

v.in.tig.basic doesn't create a cats file. v.support creates topology
information. Please see
http://www.ecosconsult.com.br/grass-list/arq/8920.html
for an example of how to create a cats file. If you need
more information, let me know.

Actually, that was perfect. I did not know that the cats file did not
automatically get created and now know how to create one. I have now
done this successfully but have another question. I guess this is more
of a performance question now but here goes:

I have now a map layer that has 43,000+ categories and it takes over a
minute to load up the cats when I do a d.what.vect.

Is this what most people get?

Am I trying to do too much with this tiger line import cats file to
query it for street names?

Ed