[gdal-dev] pixel/line mapping for two images.
belaid_moa at hotmail.com
Sat Sep 12 14:29:27 EDT 2009
Thanks for the reply. I do not see how anti-aliasing techniques could be used here.
Does anyone else have simple answers to the two elementary questions?
Thanks a lot in advance.
With best regards.
> Date: Sat, 12 Sep 2009 16:24:54 +0530
> Subject: Re: [gdal-dev] pixel/line mapping for two images.
> From: chaitanya.ch at gmail.com
> To: belaid_moa at hotmail.com
> CC: gdal-dev at lists.osgeo.org
> GDAL uses various interpolation/resampling algorithms like nearest
> neighbour, bilinear, cubic, cubic spline and lanczos. However, I think
> these may not be what you are looking for.
> Computing the overlap of pixels of two images should not be a complex
> process. You may find some ideas with anti-aliasing techniques.
> On Sat, Sep 12, 2009 at 12:36 PM, Belaid MOA <belaid_moa at hotmail.com> wrote:
> > Hi everyone,
> > I have two elementary questions about how GDAL maps the pixel/line of one
> > image to an other image.
> > Suppose we have two GeoTiff images with different spatial resolutions and
> > projections.
> > According to GDAL code, a pixel/line (i,j), more precisely its center
> > (i+0.5,j+0.5), of the first image is mapped to the pixel/line (p,q) of the
> > second image, where p and q are doubles that usually have fraction parts.
> > My questions are: what is the meaning for these fractions? Is it possible to
> > use these fractions to compute the overlap between
> > the pixels of the two images using GDAL?
> > Any help on this is very appreciated!
> > Thank you very much in advance.
> > ~Belaid.
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> Best regards,
> Chaitanya kumar CH.
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