Dear list,
I am new to programming with GDAL (and to the ECW format). Let me say
thank you first, because my first experiences have been rather pleasant,
even if my setup is relatively involved (thanks everybody for providing
good documentation):
- Ubuntu 12.04 (AMD64)
- GDAL 1.10.1 (build from s
Markus,
I believe the GDAL ECW driver will pass RasterIO() requests through to the
ECW SDK to evaluate meaning that there is no constraint based on the
advertized power-of-two overviews exposed from GDAL and no loss of quality.
Best regards,
Frank
On Wed, Sep 4, 2013 at 6:52 AM, Markus Schneide
Frank,
thanks for your reply. Could you (or somebody else) give me a few more
details how to get hold of a raster region with a resolution that is not
defined by an overview?
Currently, I am able to extract regions from an overview using the
following steps (in Java):
...
Dataset dataset = gda
I believe I learned how to do this, so to answer my own question:
Some of the Band.ReadRaster(...) methods allow to explictly specify the
buffer width and height, e.g. [1]. This allows to extract resolutions
that differs from the original image (and the overviews).
Best regards,
Markus
[1] http:
There's one question remaining:
Will the mentioned methods automatically select the best-matching
overview, or do I have to do this myselft in order to achieve the best
performance?
This probably doesn't matter to ECW, but to other image formats with
"real" overviews (such as GeoTIFF), right?
Be
Ok, I just tried it out with an example GeoTIFF, and the mentioned
methods seem to benefit from overviews in the file, so it seems to
automatically do the right thing.
Best regards,
Markus
Am 10.09.2013 11:20, schrieb Markus Schneider:
> There's one question remaining:
>
> Will the mentioned met
