[gdal-dev] [Qgis-developer] Large raster (ecw) identify very long

[Radim Blazek]

Even,
thanks for exhaustive explanation and testing.

On Wed, Aug 22, 2012 at 2:37 PM, Even Rouault
<even.rouault at mines-paris.org> wrote:
>> I found in GDAL ecwdataset.cpp that it is treating  single row
>> requests in IRasterIO in a special way:
>
> I tried the following Python script that must be representative of how QGIS must
> do picking (I guess it does a RasterIO(, .... x, y, 1, 1, ... 1, 1) )

Yes.

> I suppose your workaround in QGIS will be to read 1x2 pixel or something like that.

Yes, I have used 2x2.

Radim