On Fri, Feb 8, 2013 at 7:05 PM, Ákos Maróy <[email protected]> wrote:
> On 06/02/13 19:54, Andrea Aime wrote:
>
> On Tue, Feb 5, 2013 at 9:34 PM, lysgaard <[email protected]> wrote:
>
>> Hi, I'm working for the OAM project to create an open aviation map.
>> One feature that is qute special for aviation maps is MORA grid heights.
>> http://en.wikipedia.org/wiki/MORA_(aviation)
>> <http://en.wikipedia.org/wiki/MORA_(aviation)>
>> To calculate these I need to extract the biggest elevation within a lat
>> lon
>> square.
>> Right now I've got the elevation data from the NASA SRTM set in Geoserver.
>> Anyone
>> know how to extract the largest height in a square from this using
>> Geoserver?
>>
>
> You'll have to write a WPS process, probably one wrapping the
> Extrema operation, which should give you min and max,
> and then chain it with the existing CropCoverage operation that will
> allow you to restrict the operation to the desired area.
>
> I see. but would this allow to generate the maximum value for each 1x1
> degree grid somehow?
>
> basically the task is to 'reduce' the SRTM elevation grid into 'one value
> per 1x1 degree area' where that value is the max value of all pixels for
> that area.
>
Ah, no it won't, I thought you wanted something "interactive" with the user
picking the
area of interest.
A WPS process is still probably the best option, but you'll have to iterate
the extrema
operation over the 1x1 degree squares and build another grid
Cheers
Andrea
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