[gdal-dev] Can valid cloud-optimized geotiffs have non-sequential tile ordering?

[Even Rouault]

Scott,

>
> Since a key aspect of COGs is efficient network access, shouldn’t this 
> file not be considered a COG?

The row-major order (that is tiles are sorted from top-to-bottom, 
left-to-right) used by the GDAL COG driver is one of the many possible 
ways of having spatial contiguity being omewhat reflected in a file 
linear organization. But someone could also possibly use other ordering 
techniques, like Hilbert curves or other space-filling curves 
(https://en.wikipedia.org/wiki/Space-filling_curve), to also achieve 
that purpose. Hence COG hasn't standardized on that. You could possibly 
open an issue related to that at 
https://github.com/opengeospatial/CloudOptimizedGeoTIFF/issues

Even

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