[GRASSLIST:3085] Re: TIGER/Line Data

[Ben Logan]

On Sun, Feb 03, 2002 at 01:30:33PM -0700, Roger Miller wrote:
> On Sunday 03 February 2002 12:50, you wrote:
> 
> > Does GRASS support the TIGER/Line data format used by the Census
> > Bureau?  I looked on the GRASS homepage, but couldn't find anything
> > about it.
> 
> I did this recently with Tiger 2K county data.  I used v.in.tig.basic.  I got 
> the lines themselves, but I didn't get the topology or the attributes.

I created a new GRASS location using lat/long as a coord system, grs80
as the spheroid, and nad83 as the datum.  I used the default region
and figured I could always change that later.  I also created a mapset
called "carroll" (the name of my county) to hold the maps.

I then downloaded the TIGER/Line 1997 file of my county (tgr51035.zip)
and unzipped it into a directory.  Here's the command I used to import
them:

v.in.tig.basic t1=TGR51035.RT1 t2=TGR51035.RT2 out=carroll spheroid=grs80

(I assumed that I didn't need to use the 'zone' option since my
location uses lat/long.)

It ran for awhile and didn't produce any errors.  I then set the
region:

g.region vect=carroll

And used d.vect to display the map.  Nothing showed up, though, until
I ran v.support on the new map.

Even now, the map looks slightly distorted (could be my imagination
though) and when I try to zoom in with d.zoom, it won't let me get
close at all.  Did I do something wrong with the coordinate system?

Thanks,
Ben

-- 
Ben Logan: ben at wblogan dot net
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