[mapserver-dev] Mapscript Raster Query Problem

[geographika]

Hi Frank,

I see you have recently been working on the raster queries - 
http://trac.osgeo.org/mapserver/changeset/10076, but I don't think it is 
related.
I've added a new ticket - http://trac.osgeo.org/mapserver/ticket/3425
There may be a problem with my understanding of the CLASSITEM and 
EXPRESSION for rasters, but as I say they show exactly as intended in 
MapServer.
If there are any more details required please let me know.
Thanks,

Seth

On 09/04/2010 00:36, Frank Warmerdam wrote:
> geographika wrote:
>> Hi list,
>>
>> I have some Python code running on MapScript which queries a raster 
>> layer by an input point. The following lines:
>>
>>     for i in range(layer.numitems):
>>             print '%s: %s' % (layer.getItem(i), s.getValue(i))
>>
>> With this I get the output below:
>>
>> x: 249975
>> y: 249975
>> value_0: 3
>> value_list: 3
>> class: 50-100m
>> red: 162
>> green: 180
>> blue: 189
>>
>> But no matter which points I use the class and the rgb values remain 
>> the same. However the value_0 and value_list are always correct. I 
>> have a hack to get the correct class based on the value, but I'd 
>> appreciate any further clarification on why the same values are 
>> always returned. The raster displays without problems through 
>> MapServer showing the correct classes for each pixel.
>> Regards,
>
> Seth,
>
> If you can file a detailed ticket I am interested in investigating this
> problem.
>
> Best regards,