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more fleshing out of spatial ref section

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git-svn-id: http://svn.osgeo.org/postgis/trunk@2975 b70326c6-7e19-0410-871a-916f4a2858ee
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Regina Obe 2008-09-17 04:14:15 +00:00
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doc/using_postgis.xml
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@ -276,8 +276,16 @@ geometry
<para>Some of the more commonly used spatial reference systems are: <ulink url="http://spatialreference.org/ref/epsg/4326/">4326 - WGS 84 Long Lat</ulink>,
<ulink url="http://spatialreference.org/ref/epsg/4269/">4269 - NAD 83 Long Lat</ulink>,
<ulink url="http://spatialreference.org/ref/epsg/3395/">WGS 84 World Mercator</ulink>,
<ulink url="http://spatialreference.org/ref/epsg/2163/">US National Atlas Equal Area</ulink>
</para>
<ulink url="http://spatialreference.org/ref/epsg/2163/">US National Atlas Equal Area</ulink>,
Spatial reference systems for each NAD 83, WGS 84 UTM zone - UTM zones are one of the most ideal for measurement, but only cover 6-degree regions.
</para>
<para>
Various US state plane spatial reference systems (meter or feet based) - usually one or 2 exists per US state. Most of the meter ones are in the core set, but many of the
feet based ones or ESRI created ones you will need to pull from <ulink url="http://spatialreference.org">spatialreference.org</ulink>.
</para>
<para>
For details on determining which UTM zone to use for your area of interest, check out the <ulink url="support/wiki/index.php?plpgsqlfunctions">utmzone PostGIS plpgsql helper function</ulink>.
</para>
<para>The <varname>SPATIAL_REF_SYS</varname> table definition is as
follows:</para>