Re: [gdal-dev] Update on RFC 62: Raster algebra

2016-09-22 Thread Richard Barnes
In building tile/block managers, I too have found it difficult to use iterators or design algorithms without specifically considering both tiles/blocks and cells. Without doing so, it is very easy to write code which is (extremely) cache inefficient. I'm not sure if flow algebras have arisen

Re: [gdal-dev] Update on RFC 62: Raster algebra

2016-09-22 Thread Ari Jolma
13.09.2016, 15:40, alex kirjoitti: Ari Wrote: At FOSS4G my conclusion was that my first approach was not good for many reasons, most >importantly because it did not scale to several bands in one operation. So I've trying with the >following ideas/decisions: The problem is to compute y=f(x1,