From: Robert Lipe <robertlipe@us...> - 2003-10-02 23:08:37
Some cat trolled me privately to look at adding support of esri
shapefiles. I roamed around the net and found a library with a
compatible license, a reasonable API, and portability goals similar to
ours. I sketched out a proof-of-concept that could pull waypoints out
of a dbf/shp pair of points. But then he flatlined and quit answering
As I roamed around the net to see what kind of data was actually
available in shapefiles, I either lacked the imagination to see how
it was useful to pass through GPSBabel or the googling skills to find
I'd consider it adequate justification to finish it if I could find
major U.S. roads in this format just to hitch it to Ron's arc filter
since that seems to be the sort of stuff this format is used for a lot.
The code isn't huge (20K of x86 .text) and the backend goop in GPSBabel
is pretty mechanical impedance matching. So it's not hard; I just can't
find a reason to care. So I've had it in a corner as a curiosity. Do
any of you know of any reason to finish this?
From: Ron Parker <ron@pa...> - 2003-10-05 04:57:28
At 06:07 PM 10/2/2003 -0500, Robert Lipe wrote:
>I'd consider it adequate justification to finish it if I could find
>major U.S. roads in this format just to hitch it to Ron's arc filter
>since that seems to be the sort of stuff this format is used for a lot.
It's not adequate reason to finish it, because I don't think it's exactly
what you're looking for, but the Bureau of Transportation Statistics
publishes something called the National Transportation Atlas Database
that is, in fact, in .shp format and does, in fact, contain all of the
major U.S. roads (Interstates, US Highways, and some state roads.)
However - and this is a big however - they're all in one big shape file,
so unless you want to come up with some way to extract a given road and
then compute the part of that road that actually matters to you, it's not
worth much except as a curiosity or a low-resolution base map.
.SHP would be something of a nod to the high-end GIS folks, as none of the
formats Babel supports right now are really serious GIS formats. .SHP
isn't really, either, but it's closer than anything we've got.
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