[GRASSLIST:1901] RE: trouble with TIGER data

John Gillette JGillette at rfmd.com
Wed Nov 26 17:57:02 EST 2003

Try preprocessing the type1 file with awk to strip out only the 
roads.  see the census technical data for the code.
Similar to the hydrography data example discussed in the link

use v.in.tig.basic on the striped type1 file and the normal
type2 file.  This should give you a map with only roads.
You can break apart the data this way and display it all
but only search the roads layer.


-----Original Message-----
From: Ed Davison [mailto:bfdi533 at cbacc-security3.bus.utexas.edu]
Sent: Wednesday, November 26, 2003 5:07 PM
To: grasslist
Subject: [GRASSLIST:1900] RE: trouble with TIGER data

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?


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