Source ground pixel spacings (azimuth x range) vs pixel spacing

Good morning,

I have noticed that pixel spacing (m) has by default the value of the largest dimension of source ground pixel spacings (azimuth x range), why?

I realized that, after terrain correction, source ground pixel spacings (azimuth x range) represents the sizes of the pixels in the image, but I don’t understand well what is pixel spacing (m) in the image.

Could you write the correct definitions of source ground pixel spacings (azimuth x range) and pixel spacing, please?

Thanks in advance.

Wikipedia is your friend:

The articel says:

In remote sensing, spatial resolution is typically limited by diffraction, as well as by aberrations, imperfect focus, and atmospheric distortion. The ground sample distance (GSD) of an image, the pixel spacing on the Earth’s surface, is typically considerably smaller than the resolvable spot size.

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Only one more question on the topic but after terrain correction pixels size is always a square in the image?Thanks

Yes, Terrain Correction always outputs square pixels by definition.

Then, azimuth resampling to the desired output pixel spacing. This compensates for the range-depend pixel spacing at the output of deramp and FFT. This may also include averaging to extract additional azimuth looks.

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