[Mapserver-users] Layer interpolation

[Aaron D. Hunt]

You maybe right. It was a thought I had and just wanted to see if there 
was any interest out there beside me. In my every day work, I use a lot 
of data sets that needs interploated on the fly (ie Yield data from a 
Corn field). I either have to wast time trying to paste together a 
script to do it or wait for one of our programs to do it for me. Most of 
the time I just need a quick and dirty interp the would nice if I could 
have mapserver do it (even if it took mapserver a few more seconds to do 
it).

Aaron

Frank Warmerdam wrote:

> Aaron D. Hunt wrote:
>
>> Has there ever been any thought on adding a interpolation object. 
>> What I am thinking of is the ability to have point layer and then 
>> tell mapserver to interpolation the data into a raster layer. The 
>> interpolation could be done using some fast  inverse distance 
>> weighting method.
>> example:
>> LAYER
>>    TYPE   INTERPOLATION
>>    DATA   point_shape_data
>>    INTERPOLATIONITEM"[column]"
>>    CLASSITEM "[pixel]"
>>    INTERPOLATION
>>           R_VALUE  4
>>           RESOLUTION_UNIT   meter
>>           RESOLUTION  5
>>    END
>>    CLASS
>>        EXPRESSION ([pixel] < 64)
>>        COLOR 0 0 0
>>   END
>>   CLASS
>>        EXPRESSION ([pixel] >= 64 AND [pixel] < 128)
>>        COLOR 255 0 0
>>  END
>>
>> END
>
>
> Aaron,
>
> This is an interesting idea, but in my mind it falls into the 
> "MapServer is
> not a GIS" category of putting too much analysis into MapServer 
> itself.  Also,
> point interpolation for any significant number of points can be pretty 
> expensive
> to do in a web mapping context.
>
> Best regards,