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How to convert utm shp file to long/lati shp file?
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How to convert utm shp file to long/lati shp file? =?gb2312?B?0rvK18qr?= 12-20-2006
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Posted by =?gb2312?B?0rvK18qr?= on December 20, 2006, 6:38 am
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 Hi all!

I've searched by google on this topic but there seems to be no simple
tools to do so.

Could anybody help me on this topic?


Posted by Trond Michelsen on December 20, 2006, 7:11 am
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 一首诗 wrote:
> Hi all!
> I've searched by google on this topic but there seems to be no simple
> tools to do so.
> Could anybody help me on this topic?

There's a utility called shpproj which can do this. shpproj is part of
shapelib.

http://shapelib.maptools.org/
http://shapelib.maptools.org/shapelib-tools.html#shpproj

--
Trond Michelsen

Posted by =?gb2312?B?0rvK18qr?= on December 20, 2006, 10:09 am
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Thanks!

And I just found that MapInfo could do that too. Save the tab file in
Long/Lati format, and use Universal Transport tools to convert it.

The converted shp file is just what I want!

Trond Michelsen wrote:
> =D2=BB=CA=D7=CA=AB wrote:
> > Hi all!
> > I've searched by google on this topic but there seems to be no simple
> > tools to do so.
> > Could anybody help me on this topic?
>
> There's a utility called shpproj which can do this. shpproj is part of
> shapelib.
>
> http://shapelib.maptools.org/
> http://shapelib.maptools.org/shapelib-tools.html#shpproj
>=20
> --=20
> Trond Michelsen


Posted by Tom Russo on December 21, 2006, 2:00 pm
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On Wed, 20 Dec 2006 13:11:39 +0100, Mr. Richard Fayler of Fort Lee, New Jersey
Rosannadanna:

> 一首诗 wrote:
>> Hi all!
>> I've searched by google on this topic but there seems to be no simple
>> tools to do so.
>> Could anybody help me on this topic?

> There's a utility called shpproj which can do this. shpproj is part of
> shapelib.

> http://shapelib.maptools.org/
> http://shapelib.maptools.org/shapelib-tools.html#shpproj

But be careful. shpproj does not do datum conversions properly. As long
as you are always keeping both source and destination projections in the
same datum it's fine, but never use shpproj if your two projections are
in different datums. If you try to do so it'll look like it's worked, but
it will be wrong.

Another tool that does the trick is the "ogr2ogr" program from GDAL.
(http://gdal.maptools.org/) It can do the conversions and do datum
shifts, too. I strongly recommend this tool over the shapelib tools.

--
Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
one trick, rational thinking, but when you're good and crazy, oooh, oooh,
oooh, the sky is the limit!" --- The Tick

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