[OSGeo-Discuss] WCS/WMS accuracy tests?

Simone Giannecchini simone.giannecchini at geo-solutions.it
Thu Dec 10 14:45:20 PST 2009

Dear All,
I have spent some time investigating this isue with GeoServer trunk.



you can find a quick detailed report. I am particularly interested in FrankW


Steven M. Ottens wrote:
> On Dec 7, 2009, at 5:47 PM, Stephen Woodbridge wrote:
>> Steven M. Ottens wrote:
>>> I know there have been speed tests between different WMS services,
>>> but I'm wondering has there been any data-quality/accuracy test been
>>> done between WMS and/or WCS services?
>> I wonder if this is the difference between pixel as a point versus pixel
>> as an area. Mapserver uses gdal to handle GeoTiff files and Frank has put
>> a lot of effort in Gdal to handle this correctly.
> That's our feeling as well. Andrea mentioned that there's an issue with
> different interpretations on the location of a pixel (centre vs.
> top-left).
>> Also, I'm surprised that there is any shift in mapserver because I do not
>> think mapserver reprojects data if the in and out projections are the
>> same. I can speak for the other services as I don't know how they work.
> I'll be doing more detailed tests tomorrow and will post an overview then
> with the exact versions and configurations and results if people want to
> reproduce them. I f people have suggestions for specific tests or
> configurations I'm happy to apply those if possible.
> Going to test with the latest Geoserver nightly, Mapserver 5.6.0-rc1,
> Deegree 2.3 rc1 on a windows 2003 machine. With two different GeoTIFFs
> (one in epsg:4326 and one in epsg:3035)
> Steven_______________________________________________
> Discuss mailing list
> Discuss at lists.osgeo.org
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