[gdal-dev] Need some inputs on using GDAL.

[Roger André]

You might take a look at whether GMT can do what you need by using the
grdmath command.  The documentation for it is here,
http://gmt.soest.hawaii.edu/gmt/doc/gmt/html/man/grdmath.html.  I find that
it is a frustratingly difficult tool to learn how to use, but capable of
things similar to what you've described below.

Roger
--

On Thu, Jun 11, 2009 at 7:14 PM, Belaid MOA <belaid_moa at hotmail.com> wrote:

>  Greetings Everyone,
>
>    I would like to programmtically use GDAL to write a C++ program that
> takes two Geotiff images and uses the first image to create a mask that will
> be applied to the second image. The first image geographically contains the
> second image. The mask is computed from the first image using certain
> criteria on the values of its pixels. The mask is used to limit the
> processing of the second image into only the areas specified by the mask.
> The results of the processing is a new image that has the same projections
> as the second image.
>
>   A first elementray solution I was thinking of is to use *
> GDALCreateGenImgProjTransformer()<http://www.gdal.org/gdal__alg_8h.html#7671696d085085a0bfba3c3df9ffcc0a>
> *  to create the transformer between the first and the second image. Then,
> loop over the pixels of the second image and call *
> GDALGenImgProjTransform()* to find the corresponding pixel in the first
> image, compute the mask, and process the pixel of the first image
> accordingly. The results of the processing are written into disk using *
> Create()*
>
>    1- Any inputs on how to improve this elementray solution? Is it possible
> to use GDALWrapper for that?
>    2- Is there an easy way for creating an output file with the same
> metadata as the second image?
>    3- Is there any code I can look at for doing the masking?
>    **
>   Any help on this is very appreciated.
>
>  Thanks a lot in advance.
>
> ~Belaid...
>
>
>
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