[mapserver-dev] WMS exception for requests width height=1

Martin Kofahl martin.kofahl at gmail.com
Wed Apr 10 11:40:11 PDT 2013

currently, I see wms clients (qgis, arcgis 10) doing getmap requests with
height=1. MapServer (6.2) throws an exception:

msDrawMap(): Image handling error. Unable to initialize image.
msCalculateScale(): General error message. Invalid image extent, minx=nan,
miny=nan, maxx=nan, maxy=nan.

The reason is in msAdjustExtent(), where the cell size is calculated
using MS_CELLSIZE(miny,maxy,height), defined as ((max - min)/(d-1)).
Formally, I don't see any reasons against 1 pixel requests. What are
the reasons for "d-1"?

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