On 2017-06-28 9:10 AM, Even Rouault wrote:
Hi,
I'm pretty sure this must have annoyed a lot of people. When you run
gdaladdo, you need to specify the appropriate overview levels. Generally
you use power-of-two factors, but the question is then: what is the last
relevant factor given the dimension of my file size ?
I've a ready to commit improvement where you can just do :
gdaladdo [other options] my.tif
and it will compute the appropriate power of two factors until the
smallest overview is smaller or equal to 256x256 (this threshould can be
adjusted with a new -minsize switch. Actually it should be named
-maxminsize, since this is the maximum size of the smallest overview,
but I guess -minsize will be clear enough)
The effect of this patch is the same as specifying manually all the
overview factors implicitly computed. That means existing overview
levels will be recomputed if their factor match one of the implicitly
computed factors. Or they will be left unchanged if not matching one of
the implictly computed overview factors.
Thoughts ?
I agree with Andrea. I've been copy/pasting the command with the
power-of-2 levels for almost 2 decades it seems ha, and I am sure 99% of
the users do the same. This is a great addition!
-jeff
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