[postgis-users] custom EPSG codes?

[chrispg]

Hi Rob
I've created a new entry in  /usr/share/proj/epsg, calling it 27701 for now
presumably units are abbreviated to 'dm' ??

Not sure what you meant by this bit however
then use +init=my:

thanks 
chris


Robert Coup-4 wrote:
> 
> On Tue, Jul 20, 2010 at 8:06 AM, chrispg <chrisemberson at hotmail.com>
> wrote:
> 
>>
>> I have data in British Nat Grid that I would like to load into postgis.
>> Normally I would use EPSG:27700 to do this no problem, but the
>> coordinates
>> are to decimetre precision, not metre, so 27700 is out by a factor of 10.
>> I
>> can edit the spatial_ref_sys.sql to generate a custom projection file,
>> but
>> then performing any queries on that using the PROJ4 libraries are a
>> problem
>> as it is not recognised. Has anybody come across this before?
>>
> 
> Maybe add your new projection to the proj4 library as well?
> 
> Copy the 27700 line from /usr/share/proj/epsg to /usr/share/proj/my using
> a
> new number (eg. 927700), set the same number in spatial_ref_sys, and then
> use +init=my:927700 with proj4, and srid=927700 in postgis...
> 
> If decimeters are regularly used in datasets, consider submitting to
> http://www.epsg.org/ to get assigned an "official" number.
> 
> Rob :)
> 
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