[postgis-users] How to reproject data with custom projection?

[Aren Cambre]

Just want to confirm that it was 3082. Reprojecting from 3082 to 3081 makes
it mes well with within my existing data. Thank you so much!

Aren

On Sun, Jan 9, 2011 at 9:10 PM, Aren Cambre <aren at arencambre.com> wrote:

> Ben and Paul,
>
> Thank you!
>
> I didn't know about http://prj2epsg.org. Nice site.
>
> I was aware of http://spatialreference.org/, but in retrospect I was
> trying to find an exact match of the entire WKT using that site's search
> engine and Google. Thanks for the tip about searching on shorter parts.
> Yeah, I know, "how to use search engines 101". :-)
>
> Aren
>
> On Sat, Jan 8, 2011 at 11:35 PM, Ben Madin <lists at remoteinformation.com.au
> > wrote:
>
>> Aren,
>>
>> You need a reference projection, you are correct.
>>
>> For the sake of the exercise, bookmark
>>
>> http://spatialreference.org/
>>
>> and then try the search box for parts of the string which are maybe
>> unusual :
>>
>> I tried
>>
>> *"Standard_Parallel_1",27.5 **Lambert_Conformal_Conic*
>>
>>
>> in the search box.
>>
>> then I reckon you can probably choose any of the three results I get -
>> there appears to be very little difference between them and your string.
>>
>> If you haven't used this site before, looking at the
>>
>>
>>    - Well Known Text as HTML<http://spatialreference.org/ref/epsg/3082/html/>
>>    - Human-Readable OGC WKT<http://spatialreference.org/ref/epsg/3082/prettywkt/>
>>    - Proj4 <http://spatialreference.org/ref/epsg/3082/proj4/>
>>    - OGC WKT <http://spatialreference.org/ref/epsg/3082/ogcwkt/>
>>    - JSON <http://spatialreference.org/ref/epsg/3082/json/>
>>    - GML <http://spatialreference.org/ref/epsg/3082/gml/>
>>    - ESRI WKT <http://spatialreference.org/ref/epsg/3082/esriwkt/>
>>    - .PRJ File <http://spatialreference.org/ref/epsg/3082/prj/>
>>
>> options will help.
>>
>> Good luck (from the antipodes, so take your chances)
>>
>> cheers
>>
>> Ben
>>
>>
>>
>> On 09/01/2011, at 3:18 PM, Aren Cambre wrote:
>>
>> I have a SHP with this in its PRJ file:
>>
>> *
>> PROJCS["Custom",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",1500000.0],PARAMETER["False_Northing",5000000.0],PARAMETER["Central_Meridian",-100.0],PARAMETER["Standard_Parallel_1",27.5],PARAMETER["Standard_Parallel_2",35.0],PARAMETER["Central_Parallel",18.0],UNIT["Meter",1.0]]
>> *
>>
>>
>> I need to get this into 3081 somehow since it's a good projection for
>> Texas.
>>
>> I have some 3081-reprojected PoistGIS data (originally 4269) for Texas
>> already. If I load this SHP into QGIS along with other 3081 data, it appears
>> well below the other data. QGIS indicates this SHP has a custom projection.
>>
>> If I am not mistaken, to reproject with PostGIS, I need something besides
>> -1 in the geometry table. So I guess I need to specify some SRID with *-s
>> * when I run shp2pgsql? If so, what projection is this?
>>
>> Thanks, and I apologize in advance for my naivety.
>>
>> Aren
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>
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