[postgis-users] Re: new entry for spatial_ref_sys.sql - Austrian "standard" projection

[Michael Haberler]

Gabriel Ebner schrieb:
> On Sun, Jun 18, 2006 at 01:38:56AM +0200, Michael Haberler wrote:
>   
>> In Austria most geodata companies, and the land survey use something called
>> the "Bundesmeldenetz" projection which is close to EPSG 31287 but not quite.
>>     
>
> Note that this isn't the Bundesmeldenetz, which is a transverse mercator
> projection with central meridians 28, 31, and 34 degrees east of Ferro in the
> MGI datum.
>   
right.. I noticed after I sent it.. thanks..
> Small guide to Austrian EPSG codes:
>   31284 - BMN M28
>   31285 - BMN M31
>   31286 - BMN M34
>   31287 - Lambert (which is what you're probably looking 
>> [...] but not quite.
>>     
>
> Apparently PostGIS does not get datum transformation right for these SRS.
> You'd just have to add
> +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232
>   

I got this projection example from a  local GIS company, and it seems to 
work for data from different sources so far

the only difference I can discern from EPSG 31287 is +lat_0=48 instead 
of  +lat_0=47.5

I'm not a projection expert.. is your parameter set equivalent to this 
change in results?

-Michael
>   Gabriel.
>   
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