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What are the differences between these two options in satellite image metadata?

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It depends on your data provider really but https://trac.osgeo.org/gdal/wiki/rfc33_gtiff_pixelispoint has a nice note about the options in general:

RasterPixelIsArea defines that a pixel represents an area in the real world, while RasterPixelIsPoint defines a pixel to represent a point in the real world. Often this is useful to distinguish the behavior of optical sensors that average light values over an area vs. raster data which is point oriented like an elevation sample at a point.

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