[postgis-users] SRID and EPSG

[Barend Kobben]

Yes, it was Patrick van Laake (who happens to work at the same place as me).
I've copied this to him, I guess he has those view definitions somewhere...

-- 
Barend Köbben
International Institute for Geo-Information
Sciences and Earth Observation (ITC)
PO Box 6
7500AA Enschede, The Netherlands
+31 (0)53 4874253



On 27-05-08 01:07, "Paul Ramsey" <pramsey at cleverelephant.ca> wrote:

> If someone is interested in trolling the postgis-users back catalogue,
> a user a couple years ago wrote a system of views that made the ESPG
> relational structure usable as a spatial_ref_sys table.
> 
> P
> 
> On Mon, May 26, 2008 at 3:34 PM, Andy Anderson <aanderson at amherst.edu> wrote:
>>> António Pestana <afsm.pestana at gmail.com> wrote:
>>> 
>>>> What about http://www.epsg.org/databases/Discv6_15sql-PosgreSql.html ? Is
>>>> it
>>>> of any use? I'm really new to PostgreSQL and PostGIS, so may be this is a
>>>> really dumb question...
>> 
>> On May 26, 2008, at 3:04 PM, Markus Schaber wrote:
>>> 
>>> The EPSG database contains a rather complex relational structure of
>>> different tables describing reference systems, projections etc.
>>> 
>>> This relationals tructure was originally delivered as access file, but
>>> additional delivery formats (like PostgreSQL SQL dump) have been added.
>>> 
>>> The PostGIS spatial_ref_sys table itsself contains a "flattened" view
>>> of some aspects of that relational model.
>>> 
>>> So the EPSG database cannot be loaded as spatial_ref_sys table, but
>>> maybe an automatic conversion process could be developed.
>> 
>> 
>> Might it be useful to implement that relational table in PostGIS, along with
>> functions that combine them to build a spatial reference? This might make it
>> more usable in situations where you want to build your own (give me the WGS
>> 84 datum, a Lambert conformal conic with such-and-such standard parallels,
>> and a coordinate origin at this point). Or is that just too uncommon and
>> complicated for most users?
>> 
>> The current SRID table would still exist but be built at install time, of
>> course.
>> 
>> -- Andy
>> 
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