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

[thomas bonfort]

Martin,
do you know why these clients are sending 1px getmap requests ?

--
thomas


On 10 April 2013 20:40, Martin Kofahl <martin.kofahl at gmail.com> wrote:

> Hello,
> 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"?
>
> Martin
>
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>
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