Benoît Thiébault wrote:
> Hi Simone and Martin, and thank you for your answers.
>
> Indeed my NetCDF files contains geometries and not rasters.
>
> So I guess I will write my own DataStore.
>
> By the way, does anybody know why the memoryDataStore is not  
> recommended ?
>   
MemoryDataStore is fine - it actually stores the information internally 
in a TreeMap sorted by FeatureID (so your features are always in the 
same order not that you care). It would be slightly more cool to store 
them in a SpatialIndex (so we could do bounding box queries very quickly).

I would personally try out MemoryDataStore - and if you need more speed 
in any particular direction then let us know and we can point you in a 
good direction.

Jody

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