Hello Mickael
The timming is amazing, since I'm revisiting Operation2D and OperationJAI since
yesterday!
Michael Bedward a écrit :
> Currently, some JAI functions are wrapped in...
>
> - sub-classes of Operation2D (e.g. Resample)
>
> - sub-classes of OperationJAI (all the 'straight' wrappings ?)
Yes. Those subclasses delegate the calculation of pixel values to JAI. What the
add (compared to JAI) is the calculation of other properties that are not
managed by JAI, more specifically:
* The CRS (most of the time it doesn't change).
* The Envelope (it still often the same).
* The SampleDimensions
The last point is the hard one to me - I could elaborate more on it in a next
email, for now I'm not sure it is the point you are interrested in.
OperationJAI makes assumption about what those properties are calculated, and
try to make as much calculation as possible for you. If the assumptions that
OperationJAI make are not suitable to you, you can go up one class in the
hierarchy. For example Operation2D make less assumptions (the most obvious one
being that the operations are applied on 2 dimensional matrix), etc.
I will try to document more the assumptions today, since I'm working on it.
Martin
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