On Tue, Apr 7, 2015 at 11:58 AM, Peter Borissow <peter.boris...@yahoo.com>
wrote:
> Adding "+towgs84=0,0,0" to cs2cs helps but the coordinates are a few
> meters off in the y axis for the autalic sphere, at least on my computer:
>
> cs2cs WGS84 --> NSIDC EASE-Grid Global (EPSG:3410)
> 10 10 --> 963010.77 1269208.67 6269.40
> -50 -50 --> -4815053.87 -5620001.73 -5596.48
> 130 60 --> 12519140.07 6360484.35 -9095.78
>
>
> GeoTools WGS84 --> NSIDC EASE-Grid Global (EPSG:3410) --> WGS84
> 10 10 --> (963010.7746492706, 1269160.2484886926) --> (9.999298124584156,
> 9.999999999999998)
> -50 -50 --> (-4815053.873246353, -5619998.269851232) -->
> (-49.999747948114184, -50.0)
> 60 130 --> (1.251914007044052E7, 6360499.695165725) -->
> (60.00023521376756, 130.0)
>
>
> Also, I noticed that in GeoTools, the coordinates are off after a full
> roundtrip. Maybe that's normal but I wanted to bring it to your attention.
>
The fact they are off after a full roundtrip is normal, precision of
floating point numbers is limited.
But I don't know about the residual difference between cs2cs and geotools,
nothing comes to mind right now.... I'll try to
have another look, but it might be some days before I have time again
I'd suggest that in the meantime you contribute what you can with a pull
request, with proper headers, and
send the copyright assignment to OSGeo
Cheers
Andrea
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