[Qgis-developer] ESA Summer of Code In Space

[David Burken]

On 06/29/2011 09:50 AM, Andreas Neumann wrote:
>>> Support of resampling methods for the display of the raster data
>>> (bilinear,cubic,cubicspline,lanczos). Gdal supports these, but QGIS 
>>> does not
>>> use them.
>>>
>>> QGIS currently only supports nearest, as far as I know, which 
>>> results in
>>> very ugly display. It is the main reason I am still also using UMN 
>>> mapserver
>>> next to QGIS server.
>>
>>  Ugly? Interpolation of rasters at low resolution looks even more ugly
>> to me. At least the 'nearest' algorithm, showing grid cells as cells,
>> is honest to the data, unlike interpolation algorithms which don't
>> have statistical weight behind them.... Anyway, your mileage may vary
>> :)
>
> it really depends on the nature of the raster. color-table based 
> rasters or 1bit rasters cannot be resampled of course - but the 
> display quality of scanned rgb maps, aerial images or 8bit grayscale 
> maps would benefit.
>
> Andreas
Also satellite data that is being ortho-rectified on the fly will have a 
rotation, in which case nearest neighbor is a bad option.  Note Ming's 
new ossim provider will be able to do this(ortho) once pushed out.

Dave

>
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> Andreas Neumann
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