[gdal-dev] Geolocation arrays - location interpretation

[Even Rouault]

On jeudi 28 septembre 2017 17:26:52 CEST Agram, Piyush S (334D) wrote:
> Hi Even,
>      I think I have figured out how the GeoLocTransformer works. Dumped out
> the backmap and might have some changes.
 
> 
> 1)       Rounding up to the nearest integer is definitely the issue here.
> 
> 2)       I’m going to try this first – maybe a weighted approach will be
> better. For now, if a pixel falls in the middle of square – I’m going to
> add it to all of the 4 vertices. Then average all the data that went into a
> pixel of the backmap.

Perhaps bilinear resampling so that the weights are proportionnal ?

 
> 3)       For the regular grid tests, if this shows improvement (hopefully) –
> I can share the implementation and we can possibly discuss about adding a
> weighting scheme. I don’t want to increase the runtime too much by adding
> complexity.

I think (sub-pixel) accuracy is more important than speed. Speed improvements can be 
investigated later if needed.

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