mapserver tif projections
Douglass Davis
douglass_davis at EARTHLINK.NET
Thu Jul 28 11:39:21 PDT 2005
Hello All,
I just got an elevation tif file (w/aux,prj, and tfw) from the seamless
data distribution center: http://seamless.usgs.gov/. I am still trying
to understand projections, I read through the tutorial and user manual
and looked through the proj4 documentation, but I am still not really
sure how to do this.
Now, I know it uses Lambert Azimuthal Equal Area Projection. But, how do
I represent this projection in a map file, and pass the needed
parameters into proj4?
I tried putting this in my Raster tif layer:
PROJECTION
"proj=laea"
"lon_0=100.00w"
"lat_0=45.00n"
END
But it didn't work. Can some one help me with getting the correct
parameters to put in the map file?
In the metadata it has:
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:-84.84957627
East_Bounding_Coordinate:-74.99646893
North_Bounding_Coordinate:37.47563559
South_Bounding_Coordinate:33.16490113
<>
<>
<>
<>
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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