[R-sig-Geo] spTransform: wrong results??

[Agustin Lobo]

Here you have some results with
different software for the transformation
of one single  UTM 31N ED50 coordinate to
lon,lat ED50 and lon,lat WGS84.
My understanding of this problem seems to
be decreasing as I do more testing.

QGIS UTM 31N ED50

POINT(449919.586269 4631874.109627)

TRANSFORMS TO LONGITUDE,LATITUDE:

QGIS ED50
POINT(2.396864 41.836439)
QGIS WGS84
POINT(2.396864 41.836439)

GlobalMapper  ED50  2.39686371° E	41.83643863° N
GlobalMapper  WGS84 2.39572870° E	41.83535625° N

TNT WGS84
POINT(2.396864 41.836439)
TNT ED50
POINT(2.396864 41.836439)

rgdal ED50 no towgs84 field specified
WP1	2.39686370617169	41.8364386271064

rgdal WGS84 no towgs84 field specified
WP1	2.39686370617169	41.8364386271064

rgdal WGS84 with towgs84=-87, -98,-121
WP1	2.39690750837097	41.8361433350555



Agus


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