[OpenLayers-Users] conversion of bounding boxes to various projections

[stephane.poirier at usherbrooke.ca]

Hi All,

Is it easy to use openlayers to convert bounding boxes from one EPSG to another.

With WGS84 world geodesic datum projection EPSG:4326, North America has a bounding box of 
defaultBounds=new OpenLayers.Bounds(-180, 5, -10, 85); //north america, working with google, nasa, metacarta, etc.
var myproj=new OpenLayers.Projection(myepsg);

With Lambert Conic Conformal projection EPSG:42304, Canada has a bounding box of 
defaultBounds=new OpenLayers.Bounds(-2750564.75,-936638.5,3583872.5,4673125); //canada
var myepsg="EPSG:42304"; //Lambert Conic Conformal, working with http://atlas.gc.ca/cgi-bin/atlaswms_en
var myproj=new OpenLayers.Projection(myepsg);

Q: How can I have the bounding box for North America in EPSG:42304?


Stephane


Stephane Poirier - Research professional
Center of Applications in Remote Sensing
Applied Geomatics Department
University of Sherbrooke
Sherbrooke (Quebec), CANADA J1K 2R1
Tel.: (+1 819) 821 8000 #61904
Fax.: (+1 819) 821 7944
Stephane.Poirier at USherbrooke.ca
http://www.usherbrooke.ca/cartel


P.S.:

//works fine
defaultBounds=new OpenLayers.Bounds(-180, 5, -10, 85); //north america
var myepsg="EPSG:4326"; //working with google, nasa, metacarta, etc.)

//works fine
//BBOX=-2750564.75,-936638.5,3583872.5,4673125 //for canada
defaultBounds=new OpenLayers.Bounds(-2750564.75,-936638.5,3583872.5,4673125); //north america
var myepsg="EPSG:42304"; //Lambert Conic Conformal, working with http://atlas.gc.ca/cgi-bin/atlaswms_en
var myproj=new OpenLayers.Projection(myepsg);

//How to specify northern hemisphere
//defaultBounds=new OpenLayers.Bounds(-180, 0, +180, 90); //north hemisphere?
defaultBounds=new OpenLayers.Bounds(?, ?,?,?); //north hemisphere
var myepsg="EPSG:102018"; //North Pole Stereographic, working with http://atlas.gc.ca/cgi-bin/atlaswms_en 
var myproj=new OpenLayers.Projection(myepsg);


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