[Proj] UTM ED50 to ETRS89 datum shift problem
Oscar van Vlijmen
ovv at hetnet.nl
Mon Dec 4 17:14:28 EST 2006
> From: "karel cech"
> Date: Mon, 4 Dec 2006 13:20:37 +0100
> Subject: [Proj] UTM ED50 to ETRS89 datum shift problem
> Hi list,
> I have a problem with changing datum with cs2cs using 7 parameter
> shift from ED50/UTM30 to ETRS89. The result differs a lot from
> transformation results made by Carthographic Institute of Valencia
> (they work with ESRI and ERMapper)
> My test point has following coordinates (ED50/UTM30, EPSG:23030)
> What I would like to obtain is aproximatly this (ETRS89, EPSG:25830):
> However, cs2cs gives me
> The 7 parameters are defined by spanish institutions.
> The debug output from cs2cs (proj 4.4.9.):
> cs2cs -v +proj=utm +zone=30 +ellps=intl
> +units=m +to +proj=utm +ellps=GRS80 +zone=30 +units=m -r <<EOF
It is possible that your transformation parameters were for the coordinate
frame rotation model. If I negate the rotation angles to force them to
position vector rotations, I get with my stuff:
which seems to be spot on.
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