[mapserver-dev] WMS exception for requests width height=1
martin.kofahl at gmail.com
Wed Apr 10 13:00:12 PDT 2013
Not really. I expect this to be a kind of test request, but I'm not sure.
At least with qgis this looks to depend on client settings, too.
2013/4/10 thomas bonfort <thomas.bonfort at gmail.com>
> do you know why these clients are sending 1px getmap requests ?
> On 10 April 2013 20:40, Martin Kofahl <martin.kofahl at gmail.com> wrote:
>> 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"?
>> mapserver-dev mailing list
>> mapserver-dev at lists.osgeo.org
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