On Mon, Apr 6, 2015 at 7:29 PM, Andrea Aime <andrea.a...@geo-solutions.it>
wrote:
>
> Indeed quite off. This is happening because cs2cs is not applying any
> transformation to lon and lat,
> it is just taking them as valid values on the autalic sphere without
> compensating for the difference
> in flattening:
>
> cs2cs -v +datum=WGS84 +proj=lonlat +to +proj=lonlat +a=6371228 +b=6371228
> +units=m +no_defs# ---- From Coordinate System ----
> #Lat/long (Geodetic)
> #
> # +datum=WGS84 +proj=lonlat +ellps=WGS84 +towgs84=0,0,0
> # ---- To Coordinate System ----
> #Lat/long (Geodetic)
> #
> # +proj=lonlat +a=6371228 +b=6371228 +units=m +no_defs
> 10 10
> 10dE 10dN 0.000
>
> (the lat should have been something like 9.93 instead)
>
And I've already got an answer, quoting:
------------------------------------------------------------------------------
Andrea,
this must be linked to
http://trac.osgeo.org/proj/wiki/FAQ#WhydoIgetdifferentresultswith4.5.0and4.6.0
Basically you need to add +towgs84=0,0,0 to the target coordinate system so
as
to have a full datum definition.
$ cs2cs +datum=WGS84 +proj=lonlat +to +proj=lonlat +a=6371228 +b=6371228
+towgs84=0,0,0
10 10
10dE 9d56'3.819"N 6269.402
------------------------------------------------------------------------------
So, it seems that there's a new parameter that we have to add to those
cs2cs scripts
in order to get the datum shift going
Cheers
Andrea
--
==
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Ing. Andrea Aime
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