[mapserver-users] Mapserver and Spatial Extent

[woodbri at swoodbridge.com]

James,

The extents of a shapefile are stored in the file. Use shpdump and 
read the first few lines to get the extents.

-Steve

On 30 Aug 2002 at 10:02, James Anderson wrote:

> 
> Hi,
> 
> I need to know more about the EXTENT command in a Mapserver map file.   I
> have a shape file layer of Kampala.  The shapefile is in WGS 84 projection.
> The center of the Shapefile is lat=32.5747819077374 and
> lon=0.320786584028765   I need to know how to work out the Extent values
> from the lat and lon.  My map file looks like this
> 
> NAME EX1
> EXTENT   ???? ???? ???? ????
> SIZE 600 600
> SHAPEPATH "C:\Documents and Settings\Steed\My Documents\mapping\kampala\shp"
> PROJECTION
>     "proj=longlat"
>     "ellps=WGS84"
>     "datum=WGS84"
>     "no_defs"
> END
> LAYER
>   NAME "Kampala"
>   DATA kampala
>   STATUS DEFAULT
>   TYPE LINE
>   CLASS
>     COLOR 250 175 25
>   END # end of class object
> END # end of layer object
> END # end of map file
> 
> 
> If need to work out the values to put in by the ????s.   I need some
> formulas.  When I put some random values in the extent, the mapserver
> produces an image, yet it is plain white.  I believe that this is because I
> have the extent set to where there is no mapping data.  I am still very new
> to using this mapserver.  I may have other errors in my map file.  I need to
> get this mapping to work.  Can anyone help ??
> 
> Thanks,
> 
> James.
> 
> 
> 
>