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It looks like GDAL is describing the outer edge of the 'origin pixel' and Arcmap is refering to the center of the origin pixel. If you add half the resolution of a pixel they'll match fine. This definition is often different with different software, it doesnt really matter, though you should know what you're looking at so you can take it into account. One ...


I would recommend using the raster or rgdal package(s) to read tiff files. This will also set you up for success in your second question, which not only needs to be a new question but also needs more than "how to locate pixels". In the raster package you can use "raster" for single band or stack for muntiband (e.g., RGB) tiff's. In rgdal you can use ...

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