[gdal-dev] pixel/line mapping for two images.

Chaitanya kumar CH chaitanya.ch at gmail.com
Sat Sep 12 06:54:54 EDT 2009


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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