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OGC Testbed-17: Cloud Optimized GeoTIFF specification Engineering Report
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| Definitionskos:definition | Cloud Optimized GeoTIFF (COG) is a new approach in using existing standards to accelerate distribution and analysis of 2D regular grid coverage data on the web. COG combines the use of the TIFF format with data structured internally in tiles and low resolutions subfiles (also called overviews). The main subfile is georeferenced using GeoTIFF tags and the lower resolution subfiles inherit the same georeferencing. This organization allows for retrieving only the part of the data needed for presentation or analysis. This capability is possible not only in the file system but also over the web if the HTTP range header is supported by the servers. This OGC Testbed 17 Engineering Report (ER) discusses the COG approach, describes how GeoTIFF is used for the lower resolution subfiles, and proposes a different path forward that integrates COG with the OGC Tile Matrix Set Standard (http://docs.opengeospatial.org/is/17-083r2/17-083r2.html). The ER includes a chapter that formalizes the draft COG specification with clear requirements. One of the common use cases for COG is the provision of multispectral remote sensing data. The increase in spatial and spectral resolution combined with more accurate sensors that require more than 8 bits per pixel results in big files that can exceed the 4 Gbyte limit of the original TIFF format. Having an OGC standard formally specifying this approach would be useful. Therefore, this ER includes a chapter that formalizes a draft BigTIFF specification, defining clear requirements. The objective is to be able to reference BigTIFF from the GeoTIFF and the COG standards. |
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| Broaderbroader | Public Engineering Report |
| http://purl.org/dc/terms/createdcreated | 2022-02-08 |
| Creatorcreator | Joan Maso |
| seeAlsoseeAlso | https://docs.ogc.org/per/21-025.html |
| Status of item in register or collectionstatus | valid |
| Notationnotation | 21-025 |
| Alternative LabelaltLabel | 21-025 |
| Cloud Optimized GeoTIFF specification Engineering Report | |
| OGC document typedoctype | Public Engineering Report |