mapserver tif projections

[Douglass Davis]

Frank Warmerdam wrote:

>Douglass, 
>
>In what way did it not work? 
>
>Try adding "ellps=sphere" to your definition.  Your current definition has
>no earthmodel definition and depending on your setup there may be no
>default. 
>
>Note that most projections on a sphere don't map well to conventional
>ellpisoid coordinate systems.  You may find you need to use "ellps=WGS84"
>instead to get good correspondence. 
>
>Good luck,
>  
>
Thanks.

Now I have:
 LAYER
   NAME         elevation
   DATA         "elevation/05539624.tif"
   TYPE         RASTER
   STATUS       ON
   PROJECTION
     "proj=laea"
     "lon_0=100w"
     "lat_0=45n"
     "ellps=sphere"
   END
 END

Before, it gave an error when trying to do the projection.
Warning: [MapServer Error]: msProcessProjection(): major axis or radius 
= 0 or not given in c:\program files\apache 
group\apache\htdocs\mapserver\nc.php on line 4


Now I get a map and that error went away (progress :-) .  But, still, no 
tif layer.

my (lat/lon) extent for the whole thing is:
  EXTENT -85 32 -75 38

Should the extent be in meters?  Isn't putting the projection in the 
layer supposed to make that transformation?  All of my other layers just 
use lat/lon not LAEA and they work fine.  So, I'm mixing two types of 
coordinates here, and it's still a mystery to me as far as how this is 
supposed to work.

Spatial_Domain:

    Bounding_Coordinates:

        West_Bounding_Coordinate:-84.84957627
        East_Bounding_Coordinate:-74.99646893
        North_Bounding_Coordinate:37.47563559
        South_Bounding_Coordinate:33.16490113

    <>

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    Spatial_Reference_Information:

        Horizontal_Coordinate_System_Definition:

            Planar:

                Map_Projection:

                    Map_Projection_Name: Lambert Azimuthal Equal Area
                    Lambert_Azimuthal_Equal_Area:

                        Longitude_of_Projection_Center: -100.00
                        Latitude_of_Projection_Center: 45.00
                        False_Easting: 0.0
                        False_Northing: 0.0

                Planar_Coordinate_Information:

                    Planar_Coordinate_Encoding_Method: Row and column
                    Coordinate_Representation:

                        Abscissa_Resolution: 1000.0
                        Ordinate_Resolution: 1000.0

                    Planar_Distance_Units: Meters

            Geodetic_Model:

                Horizontal_Datum_Name: None
                Ellipsoid_Name: Sphere
                Semi-major_Axis: 6370997.0
                Denominator_of_Flattening_Ratio: 1.0



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