[postgis-users] Help!, how i can create a SRID

[Chris Hermansen]

Hi folks;

Marco and I have been writing back and forth off-list as Dane
suspected.  I have got him as far as I can but he is now looking for
some info on projections used in Mexico.

I suggested the UTM to him as Dane points out below.  Marco is also
interested in some kind of projection that is suitable for a larger
area, like perhaps Albers or some kind of Lambert.

Is there anyone on the list who is at all familiar with customary map
projections for Mexico?

As Marco pointed out, he is willing to try making an entry for use with
proj4 but he is having trouble finding parameters.

Dane Springmeyer wrote:
> Hola Marco,
>
> Chris probablimente ayudate mejor de yo, pero...
>
> Para coordinates en X, Y, si necessitas una projecion differente de
> WGS84. No neccesitas hacer una SRID nuevo, puedas usar una SRID por
> una projecion differente. 
>
> Entonces, usted problamente necessitas cambiar la projecion desde
> WGS84 a un otro para Mexico. Possiblemente puedes usar una projection
> de "UTM" por Mexico: 
>
> Mexico incluye zonas UTM 11-14.
>
> Pues, por exemplo, a cambiar desde WGS84 a UTM 14 para region de La
> Cuidad de Mexico, puedes usar SRID como Chris, EPSG #26914
>
> Mas info por #26914 aqui: http://www.spatialreference.org/ref/epsg/26914/
>
> A Cambiar:
>
> CREATE TABLE mispuntos_utm AS
> SELECT numero,st_transform(la_geometria,26914) AS la_geometria
> FROM mispuntos;
>
>
>
> !Buenas Suerte!
>
>
>
>
> On Nov 16, 2007, at 5:07 PM, Marco Aurelio (Skull Leader) wrote:
>
>> Hi everybody, i have a lot of coordinates in WGS84 and i what a
>> projection for it ('coz  WGS84 have  Lat/Lon and i need all this data
>> en X and Y).
>>
>> I've the Lon/Lat of mi country (the section of the projection that i
>> need), some person told me that i can create a SRID for use it whit
>> the function st_transform(geo, srid)
>>
>> Thank you!
>>
>> **
>>
>>
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-- 
Regards,

Chris Hermansen · mailto:clh at timberline.ca
tel:+1.604.714.2878 · fax:+1.604.733.0631
Timberline Natural Resource Group · http://www.timberline.ca
401 · 958 West 8th Avenue · Vancouver BC · Canada · V5Z 1E5

C'est ma façon de parler.