Hi Andrea,
Thanks for reply.
I was attempting below, as you can see I was attempting to count stations
at specific location ( group by latitude, longitude ), Kindly find attached
screenshot. similar to SQL
select count(1) from sometable group by latitude, longitude.
<Transformation>
<ogc:Function name="vec:GroupCandidateSelection">
<ogc:Function name="parameter">
<ogc:Literal>data</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>operationAttribute</ogc:Literal>
<ogc:Literal>stations</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>aggregation</ogc:Literal>
<ogc:Literal>COUNT</ogc:Literal>
</ogc:Function>
<ogc:Function name="parameter">
<ogc:Literal>groupingAttributes</ogc:Literal>
<ogc:Literal>latitude</ogc:Literal>
<ogc:Literal>longitude</ogc:Literal>
</ogc:Function>
</ogc:Function>
</Transformation>
On Thu, Nov 18, 2021 at 2:46 PM Andrea Aime <
andrea.a...@geosolutionsgroup.com> wrote:
> As per process documentation (look at the DescribeProcess output):
>
> "The aggregate operation to be computed, it can be MAX or MIN"
>
> This process selects for each group just one feature, the one that has
> either the min or the max value of a given attribute
> sum or count make no sense in that context.
>
> Cheers
> Andrea
>
>
> On Thu, Nov 18, 2021 at 6:26 AM Akshay Hegde <akshay.k.he...@gmail.com>
> wrote:
>
>>
>> I had gone through
>>
>>
>> https://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-transform.html#contour-extraction
>>
>> Unfortunately below transformation with COUNT and SUM never works. It
>> only works with MIN and MAX function.
>>
>> Is there any resolution ? my aim is to get count, by grouping few
>> attributes and to have colored marker based on count value.
>>
>> example
>>
>> - count < 100 red color
>> - count > 100 and count < 1000 green
>> - count > 1000
>>
>> <Transformation>
>> <ogc:Function name="vec:GroupCandidateSelection">
>> <ogc:Function name="parameter">
>> <ogc:Literal>data</ogc:Literal>
>> </ogc:Function>
>> <ogc:Function name="parameter">
>> <ogc:Literal>operationAttribute</ogc:Literal>
>> <ogc:Literal>st:numericAttribute</ogc:Literal>
>> </ogc:Function>
>> <ogc:Function name="parameter">
>> <ogc:Literal>aggregation</ogc:Literal>
>> <ogc:Literal>COUNT</ogc:Literal>
>> </ogc:Function>
>> <ogc:Function name="parameter">
>> <ogc:Literal>groupingAttributes</ogc:Literal>
>> <ogc:Literal>st:inferredAttribute</ogc:Literal>
>> <ogc:Literal>st:inferredAttribute2</ogc:Literal>
>> </ogc:Function>
>> </ogc:Function>
>> </Transformation>
>> --
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>
>
> --
>
> Regards,
>
> Andrea Aime
>
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