[mapserver-users] Polar Orthographic Projection Using MMS
Joseph Ardizzone
ardizzone at postit.gsfc.nasa.gov
Sun Mar 23 07:03:03 PDT 2008
Hi,
I'm attempting to use the mapserver to create polar orthographic
projections. The mapfile that I am using contains several layers
including continental boundaries and the NASA Blue Marble land image.
The default output projection was set to EPSG:4326. I modified the
output projection to be:
EXTENT -6378137.0 -6356752.0 6378137.0 6356752.0
PROJECTION
"proj=ortho"
"lat_0=90.0"
"lon_0=0.0"
"x_0=0.0"
"y_0=0.0"
"ellps=WGS84"
END
When I invoke the mapserver with the modified mapfile, the continental
boundaries (polygon type shapefile) display as expected. However, the
Blue Marble image only displays along a narrow longitude boundary. If I
play with the "EXTENT" settings I can often get more or less of the
image displayed. I know that the image is global so that is not the
problem. Here is the mapfile layer information for the land:
LAYER
NAME "land"
TYPE RASTER
STATUS on
PROJECTION
"init=epsg:4326"
END
TILEINDEX "/sivo/data/bluemarble/bluemarble.shp"
METADATA
"wms_title" "Blue Marble 2002 - MODIS composite land image"
"wms_layer_group" "/Reference"
###NOTE: wms_group_abstract does not seem to work.
"wms_group_abstract" "These ancillary datasets are provided for
cartographic reference purposes."
"wms_abstract" "The Blue Marble 2002 dataset is a composite of
cloud-free land images from the Moderate Resolution Imaging
Spectroradiometer (MODIS) instrument aboard NASA's Terra satellite. The
spatial resolution is approximately 1km. The image was produced by NASA
Goddard Space Flight Center. For more information see NASA Earth
Observatory (http://earthobservatory.nasa.gov/)."
END
END
Any help is greatly appreciated. Thanks, Joe
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