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List:       postgis-users
Subject:    Re: [postgis-users] Which SRID to choose?
From:       Gerry Creager N5JXS <gerry.creager () tamu ! edu>
Date:       2004-03-29 14:47:39
Message-ID: 4068370B.1040500 () tamu ! edu
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If you've questions regarding GPS, WGS-84 or the associated geodesy, I 
can probably answer them for you...

Regards,
Gerry

Markus Schaber wrote:
> Hi, Homme,
> 
> On Thu, 25 Mar 2004 10:09:47 +0000
> Homme Zwaagstra <hrz@geodata.soton.ac.uk> wrote:
> 
> 
>>>We currently get our geometry data in longitude/latitude format in
>>>degrees (e. G., 'POINT(8.53951 47.37704)' is Z?rich).
>>
>>Have you had a look at the spatial_ref_sys table?  This is created if
>>you load the spatial_ref_sys.sql file when you enable PostGIS on your
>>database. I find this to be a valuable source of projection and SRID
>>information, especially as it lists the proj4 options for each SRID.
> 
> 
> Yes, we had, but we were rather confused by the pure amount of reference
> systems without any further pointers to explanation.
>  
> 
>>>Our two data sources currently are GPS receivers and Shapefiles from
>>>ArcView Premium.
>>
>>Your GPS receivers are likely to return coordinates in the WGS 1984
>>system. The EPSG (http://www.epsg.org/) code for this is 4326.
> 
> 
> Thanks, I now found out that GPS really seems to use the WGS 1984
> coordinate sstem.
> 
> Thanks for your additional Pointers to information, this seems very
> helpful.
> 
> Greets,
> Markus

-- 
Gerry Creager -- gerry.creager@tamu.edu
Network Engineering -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843


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