[gdal-dev] dealing with complex (a+ib) images

[Daniel Evans]

I would presume that Javier is intending to use one of the several Complex
data types that GDAL supports natively - CInt16, CInt32, CFloat32, CFloat64.

It seems that VRTs appear to have the capability to create a complex band
from two separate bands, and vice versa - the "complex", "imag", and "real"
pixel functions for "Derived Bands":
https://gdal.org/drivers/raster/vrt.html#default-pixel-functions

Cheers,
Daniel

On Sat, 27 Jul 2024 at 12:35, Greg Troxel via gdal-dev <
gdal-dev at lists.osgeo.org> wrote:

> Javier Jimenez Shaw via gdal-dev <gdal-dev at lists.osgeo.org> writes:
>
> > I have to create a complex number (real and imaginary part) image out of
> > two "normal" images or bands.
> > How can I do it?
>
> I don't know, but it would be great if you explained what that means.
> I did a quick web search and didn't find anything.
>
> There is multispectral where there are N pixel values for each x/y
> position, like RGB or many more bands.  But I am almost certain you
> don't mean that.
>
> Complex implies a magnitude and phase of a return signal and this makes
> me think about LIDAR, except the wavelength is tiny compared to features
> and ambiguity resolution seems infeasible.
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