[postgis-users] Polygon from a set of points

Leonardo Mateo leonardomateo at gmail.com
Tue Jun 12 14:24:50 PDT 2007


> Leonardo,
>
> An SRID is mostly useful to say your data is in a specified
> coordinate/datum/projection/etc system and therefore since your spatial
> reference system is known it can be transformed into another system
> using transform etc.  Sometimes the spatial reference system you get
> your data in is not the most useful for your analysis, so you transform
> to another e.g if you get data in degrees and you do analysis in meters.
>
>
> Here are a couple of links that may be useful.
> http://www.sharpgis.net/2007/05/05/SpatialReferencesCoordinateSystemsPro
> jectionsDatumsEllipsoidsConfusing.aspx
>
> These last couple I wrote just because people ask me these questions all
> the time.  Let me know if I made any possibly fallacious statements.  I
> always feel like a fish out of water so to speak in this area.
>
> http://www.bostongis.com/?content_name=srid#82
>
> http://www.bostongis.com/postgis_geomfromtext.snippet
>
> http://www.bostongis.com/postgis_pointfromtext_linefromtext_etc.snippet
>
> http://www.bostongis.com/?content_name=postgis_tut03#30 (the section
> about transforming to another spatial reference system)
Regina,
I cannot thank you enough. It is really helpful.

Cheers.


-- 
Leonardo Mateo.
There's no place like ~



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