[Proj] Environment variable et proj.4 vb wrapper

[Gheysen Thibaut]

Thanks Oscar, all was good now.

Thanks a lot for all your responses.

2006/8/8, Oscar van Vlijmen <ovv at hetnet.nl>:
>
> From: "Gheysen Thibaut"
>
> ... This is my first attempt to use proj4 and I don't know what I do
> wrong.
> Here is the definition I use :
> WGS 84 (epsg : 4326) : +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs
> no_defs <>
> Lambert 72 Belge (epsg : 31370) : +proj=lcc +lat_1=51.16666723333333
> +lat_2=49.8333339 +lat_0=90 +lon_0=4.367486666666666 +x_0=150000.013
> +y_0=5400088.438 +ellps=intl +units=m +no_defs  no_defs <>
>
> Reply:
>
> I don't do PROJ command lines, but it seems to me that you first have to
> perform a datum transform from WGS84 to International for Belgium. This
> can't be evoked with the epsg:4326 init since it has no transform
> parameters. Find the complete transform parameters, check rotation model
> and
> direction (from/to), supply the command line with a proper datum
> transform,
> then project.
>
> Belgium 1972 to WGS84:
> translation in m, rotation in arcsec, scale in ppm.
> Position vector rotation (PROJ)
> dx=-99.059; dy=53.322; dz=-112.486; rx=0.419; ry=-0.83; rz=1.885; ds=-1.00
> ;
> Derived from ESRI ArcGIS parameters.
>
> Going in the other direction, from wgs to intl, just negate all
> parameters.
>
>
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