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"description": "A Cloud Optimized GeoTIFF (COG) is a regular GeoTIFF file, aimed at being hosted on a HTTP file server, with an internal organization that enables more efficient workflows on the cloud. It does this by leveraging the ability of clients issuing ​HTTP GET range requests (see https://tools.ietf.org/html/rfc7233) to ask for just the parts of a file they need.  It contains at its beginning the metadata of the full resolution imagery, followed by the optional presence of overview metadata, and finally the imagery itself. To make it friendly with streaming and progressive rendering, the specification recommends starting with the imagery of the smallest overview and finishing with the imagery of the full resolution level. Structure is based on including image file directories (IFD) for different tile levels inside the GeoTIFF file. The TIFF specification defines a framework for an image header called 'IFD' (Image File Directory) that is essentially a flexible set of specifically those tags that the TIFF writer software wishes to specify.  The COG spec does not describe the IFD tags for COG files.",
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