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What is really happening when raster data is projected or reprojected?

Question asked by halyapetzold@gmail.com on Mar 6, 2016
Latest reply on Mar 6, 2016 by GSCUser85

This question is not specific to ArcGIS but rather is a general GIS question: what exactly happens when raster data, say for example a geotiff, is reprojected? I know from using the project raster tool that the raster cell coordinates change and, depending on the projection, the cells are rotated. Is anything else happening, or does reprojection basically just assign new coordinates to the raster cells? The project raster tool requires a resampling method as an input. Is this only used when the cell size of the output raster is different than the input raster, or is there always resampling upon reprojection?

 

Thanks in advance for your help, I dislike not understanding exactly how the tools I use work.

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