[gdal-dev] blocksize and overviews

[Andrew C Aitchison]

On Wed, 27 Feb 2019, Ooms Bart wrote:

> Hello all,
> I have a grid on a 1m resolution with a tilesize of 8000x8000.
> To speed up the rendering process I have created overviews with gdaladdo, the result you can see in the gdalinfo below.
> The default blocksize is 512x512.
> My questing handles the combination of blocksize and overviews.
> The blocksize is 512x512 and the lowest resolution of the overview
> generates a block of 63x63. Are the lower resolution overviews usefull? 
> I suppose it is only usefull to create overviews until 500x500
> if I have a blocksize of 512x512. Am I right?

It depends how the set will be viewed.

In any particular view of the data, the most useful overview has pixels 
which are about the same size as the display pixels.

-- 
Andrew C. Aitchison					Cambridge, UK
 			andrew at aitchison.me.uk