MapServer Spatial Extent

Ryan Ollerenshaw ollerery at ENGR.ORST.EDU
Thu Sep 21 16:32:04 EDT 2006


I have a shapfile of the continents thats current longitude extent is 
from -180 to 180 and i need the extent to be from 0 to 360.  I was able 
to change the projection in ArcCatalog and display the map there with 
the changed extent but when i copied this shapfile back to my MapServer, 
MapServer still displayed the shapfile from -180 to 180.  and you can 
see that in the extent of the shapefile when ogrinfo is ran on it.  but 
you can also see the projection information that ArcCatalog added that 
says there should be a false easting of -180 to correct for this.  So 
does anyone know why MapServer is still displaying the layer with an 
extent from -180 to 180?  I am using ESPG:4326 as my projection.


# ogrinfo -al -so world_adm0.shp
INFO: Open of `world_adm0.shp'
using driver `ESRI Shapefile' successful.
 
Layer name: world_adm0
Geometry: Polygon
Feature Count: 209
Extent: (-180.000183, -90.000000) - (180.000000, 83.623032)
Layer SRS WKT:
PROJCS["WGS_360",
    GEOGCS["GCS_WGS_1984",
        DATUM["WGS_1984",
            SPHEROID["WGS_1984",6378137.0,298.257223563]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Cylindrical_Equal_Area"],
    PARAMETER["False_Easting",-180.0],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",180.0],
    PARAMETER["Standard_Parallel_1",0.0],
    UNIT["Meter",1.0]]
NAME: String (40.0)
GMI_CNTRY: String (3.0)
REGION: String (25.0)

The map Layer looks like this:

 LAYER
    NAME "world"
    STATUS ON
    TYPE POLYGON
    #labelitem "name"
    DATA "world_adm0.shp"
    PROJECTION
      "init=epsg:4326"
    END
    METADATA
     wms_title "continent outline"
     wms_srs "EPSG:4326"
    END
    CLASS
        STYLE
          OUTLINECOLOR 200 200 200
          COLOR 255 255 0
          SYMBOL 0
        END
        LABEL
          COLOR 255 255 0
          TYPE TRUETYPE
          FONT times
          SIZE 9
          POSITION AUTO
          PARTIALS FALSE
          BUFFER 3
        END
    END
  END



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