Re: [Geotools-gt2-users] help with raster reprojection

[John D. <jdo...@ya...>]

Martin,  

You are correct... but this is a pretty bad situation for our application.

Example:

This envelope:
GeneralEnvelope ge = new GeneralEnvelope(2);
            ge.setRange(0, -150, -120);
            ge.setRange(1, 20, 70);

returns a projected envelope of:
[-160.817 12.508 , 176.101 72.81]
which is clearly VERY wrong (far, far too east) -- almost looks like the sign got swapped on the calculation for the 176

However this envelope (only 10 degrees more north) looks like it might be correct:

GeneralEnvelope ge = new GeneralEnvelope(2);
            ge.setRange(0, -150, -120);
            ge.setRange(1, 30, 70);
Projected envelope: [-178.617 23.017 , -110.253 72.81]


Is there no way to project a coverage that is close to the equator/poles/prime meridian?

Martin Desruisseaux <mar...@ge...> wrote: (Note: please use "Reply to all" when replying, in order to keep the thread on geotools-gt2-users 
mailing list).

John Dorado a écrit :
> It's my internal class:
> 
> MapUtil.LATLON_PROJECTION = GeographicCRS.WGS84;
>        
> [...snip...]
> 
> The output of System.out.println(ge) is:
> [180°00.0'W 00°00.0'N , 00°00.0'E 90°00.0'N]
> 
> From inspection of the image, it's hard for me to see how the right 
> longitude could possibly be so far east.  One would assume that the 
> right longitude would be very close to the prime meridian.

Try to restrict the image a little bit away from the pole, for example 89°N. Not all projection 
behave well at the pole. For example for a Mercator projection, you can get infinite value toward 
east or west.

 Martin.


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