Thanks Jody.
On Tue, Jan 26, 2016 at 4:11 PM Jody Garnett <jody.garn...@gmail.com> wrote:
> That is all really interesting, are any of the other filter functions
> suitable for use as operators?
>
None that come to mind for the purpose of classifying data into ranges. if
someone does come up with another one it should be pretty easy to add
following the pattern of the current 3 algorithms.
>
> These modules are still considered unsupported so procedure is pretty
> light :)
>
Cool. I’ll wait a bit more for other feedback and merge if no-one objects.
>
> --
> Jody Garnett
>
> On 25 January 2016 at 19:55, Justin Deoliveira <jdeol...@gmail.com> wrote:
>
>> Hi folks,
>>
>> Recently I have been given the opportunity to resurrect some code I wrote
>> a long time back. The code in question adds two processes (one vector, one
>> raster) that breaks input data into a number of classes (ranges). For each
>> range a count of features/pixels is calculated, in addition to a variety of
>> statistical values such as mean, standard deviation, etc… Three
>> classification techniques are utilized:
>>
>> 1. Equal Interval
>> 2. Quantile
>> 3. Natural Breaks
>>
>> Cutting right to the chase here is the pull request:
>>
>> https://github.com/geotools/geotools/pull/1088
>>
>> I thought I would share some additional technical details to assist in
>> the review.
>>
>> The vector side is the least interesting of the two because the process
>> simple calls through to some FilterFunctions that have existed in the
>> codebase for quite some time.
>>
>> The raster side is a bit more interesting. Basically I implemented a jai
>> operation to do the classification. I should also note that this
>> implementation pre-dates jai-ext (more on that below). The classifcation
>> operation does the breaking of the input raster data into ranges. It does
>> so by extending StatisticsOpImage.
>>
>> Once the classification is done the existing ZonalStats process is
>> utilized to calculate the various statistics requested by the caller. And
>> that is pretty much it. Feedback welcome.
>>
>> A couple of notes about further improvements that I hope to make
>> relatively soon.
>>
>> The first is probably a port of the operation to jai-ext. I started the
>> initial work for this but it’s still a work in progress. I submitted a few
>> patches to the project (which I am happy to report have been merged) so I
>> can continue to make progress.
>>
>> The second which is shorter term will be a GeoServer pull request that
>> adds support for calling the processes via the GeoServer WPS. Basically I
>> just had to add a custom PPIO to serializes the custom results returned by
>> the classification processes.
>>
>> That is about it. Eager to get some feedback.
>>
>> Thanks!
>>
>> -Justin
>>
>>
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