RE: [OpenMap Users] inverse projection

Chhaya,

You can do it yourself without the MapRequestHandler. The handler
probably doesn't know what projection you're using...is my guess. See
the following code to do it yourself:

int nProjectionType = ProjectionFactory.getProjType(projectionName);
Projection projection =
ProjectionFactory.makeProjection(nProjectionType,
                                                         lat,
                                                         lon,
                                                         scale,
                                                         width,
//width of image in web page
                                                         height);
//height of image in web page

return projection.inverse(nX, nY);

Works fine for me.

Martin Chapman

-----Original Message-----
From: Chhaya Mudgal [mailto:chhaya@imcs.marine.rutgers.edu]
Sent: Thursday, February 19, 2004 2:01 PM
To: dietrick@bbn.com; rknickm@cc.gatech.edu
Cc: openmap-users@bbn.com
Subject: [OpenMap Users] inverse projection

Hi,

I am using javascript to get x and y coordinates of the image generated
using
imageserver.

I pass these x and y coordintes to MapRequestHandler for
inverseProjection
calculations. The lat lon point that i get from the MapRequestHandler
after
conversion is different from the point at which I click on the image to
get x,y
coord.
 THe values are off drastically.

Any idea how to resolve this??

Your help is highle appreciated

THanks

Chhaya

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