[postgis-users] Coordinate transformation problem

[Guido Lemoine]

I have been working on geocoding of SAR imagery over Belgium areas.
I found back a remark in an E-mail to my collegue who used the data for
agricultural area assessment. It says:

"I have used the correct datum shifts between the WGS84 and LCC2.
I found them on a web site and they are in the order of 80 m and 120 m 
in X and Y"

But I can't remember which web site, and in what direction I applied the 
shift.

This seems to be in the order of your shift.

Guido

Arnaud Lesauvage wrote:

> Guido Lemoine a écrit :
>
>> Are you sure your Belgian Lambert 1972 has SRID 31370, and not 31300??
>
>
> I tried both projections actually ("Belge 1972" and "Belgian 1972").
>
> The content of my .prj file is :
> PROJCS["Belge_Lambert_1972",
> GEOGCS["GCS_Belge_1972",
> DATUM["D_Belge_1972",SPHEROID["International_1924",6378388,297]],
> PRIMEM["Greenwich",0],
> UNIT["Degree",0.0174532925199432955]],
> PROJECTION["Lambert_Conformal_Conic"],
> PARAMETER["False_Easting",150000.01256],
> PARAMETER["False_Northing",5400088.4378],
> PARAMETER["Central_Meridian",4.367486666666666],
> PARAMETER["Standard_Parallel_1",49.8333339],
> PARAMETER["Standard_Parallel_2",51.16666733333333],
> PARAMETER["Latitude_Of_Origin",90],UNIT["Meter",1]]
>
> If you check in your spatial_ref_sys table, this is 31370.
>
> I have even added a new line in spatial_ref_sys with this projection's 
> exact parameters, but the difference with the "real" 31370 projection 
> is only ~2 or 3 millimeters.
>
> -- 
> Arnaud
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>

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