[postgis-users] TIGER/Line Shapefiles released

[Stephen Frost]

Jonathan,

* Jonathan W. Lowe (jlowe at giswebsite.com) wrote:
> Have you yet tried overlaying TIGER 2007 linework or census block/tract
> polygons over Google or OpenStreetMap tiles?  I'm seeing a good match in
> some areas but a significant shift (~50 meters) in others.  Thought it
> might be a datum conversion issue, but can't seem to find a match.

I hadn't looked at the linework too much yet or tried to overlay it.
I'm curious where you're seeing the differences though because I know
that Census is only about half way through their MAF improvment project
and I actually have some info about what has been done so far and what
hasn't.  It'd be interesting to see if it matches up.

There are a few places (Guam, Hawaii islands) where they actually do use
an SRID other than 4269, but my scripts don't yet handle that and I'm
guessing that's not what you're referring to anyway. :)

	Thanks!

		Stephen

> On Thu, 2008-04-03 at 17:07 -0400, Stephen Frost wrote:
> > * Stephen Frost (sfrost at snowman.net) wrote:
> > > I think they may have also upgraded their pipe..  I got about 1.41MB/s
> > > (11 Mb/s) for the whole transfer.  It's about 22G all told.  I'll
> > > probably be trying to load it up into PG on one of our servers tomorrow.
> > > It was a bit over 4 hours for me to pull down off of their
> > > ftp2.census.gov ftp site.
> > 
> > Just to update those who might be interested- I've finished the data
> > load into one of our servers at work.  It comes to ~60GB on disk in
> > PostgreSQL/PostGIS with appropriate indexes in most places and whatnot.
> > Based on what I've seen so far, it looks *very* nice, especially the
> > hydrogrophy ("areawater").  It also appears to be pretty consistant
> > across the layers, which is also good.
> > 
> > If anyone's interested in the scripts used to load the data (they're
> > pretty simple, really), I'd be happy to provide them.
> > 
> > 	Enjoy,
> > 
> > 		Stephen
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> 
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