[postgis-users] Coordinate changes using transform from 1.3.1 to 1.3.6

[Miguel R. Luaces]

Hello Ben,

>I'm sure you can see the difference between postgis and especially proj
versions from this. I would guess you will need to either >upgrade one
machine or downgrade the other to be able to expect absolute concurrence.

But that's no solution.

Does this really mean that any time that PostGIS changes the Proj version my
points are going to shift?

Is this documented somewhere? A would like to read a paragraph like this
one:

"Be careful. If you upgrade Proj.4, your projected points will move 0.004
deegree to the North"

Best regards,
  Miguel



On Tue, May 26, 2009 at 2:58 PM, Ben Madin <ben at remoteinformation.com.au>wrote:

> G'day Miguel,
>
> On 26/05/2009, at 8:23 PM, Miguel R. Luaces wrote:
>
>  First DBMS:
>>
>> SELECT version(), postgis_full_version();
>>
>> "PostgreSQL 8.2.13 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2
>> (mingw-special)";"POSTGIS="1.3.1" GEOS="3.0.0rc4-CAPI-1.3.3" PROJ="Rel.
>> 4.5.0, 22 Oct 2006" USE_STATS DBPROC="0.3.0" RELPROC="1.3.1" (needs proc
>> upgrade)"
>>
>
>
>  Second DBMS:
>>
>> SELECT version(), postgis_full_version();
>>
>> "PostgreSQL 8.2.13 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2
>> (mingw-special)";"POSTGIS="1.3.6" GEOS="3.1.0-CAPI-1.5.0" PROJ="Rel. 4.6.1,
>> 21 August 2008" USE_STATS DBPROC="0.3.0" RELPROC="1.3.6" (needs proc
>> upgrade)"
>>
>
>
> I'm sure you can see the difference between postgis and especially proj
> versions from this. I would guess you will need to either upgrade one
> machine or downgrade the other to be able to expect absolute concurrence.
>
> cheers
>
> Ben
>
>
> --
>
> Ben Madin
> REMOTE INFORMATION
>
> t : +61 8 9192 5455
> f : +61 8 9192 5535
> m : 0448 887 220
> Broome   WA   6725
>
> ben at remoteinformation.com.au
>
>
>
>                                                        Out here, it pays to
> know...
>
>
>
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