Cloud-Optimized GeoTIFF Viewer

In this module, we'll demonstrate how to render a map visualizing data from Cloud-Optimized GeoTIFF (COG) sources. GeoTIFF (or any TIFF) images are allowed to have additional overview images in addition to the primary full-resolution image. In addition, the internal pixel layout of the images may be tiled instead of organized in strips. The Cloud-Optimized GeoTIFF format encourages people to host data with a regular tiled layout and with overviews built in, making it more efficient for clients to render a small portion of an image (reading only the required tiles instead of the whole thing) or a lower resolution overview.

OpenLayers has a ol/source/GeoTIFF source that can read multi-band data from one or more remotely hosted GeoTIFF sources. The exercises in this module walk through rendering of a single multi-band image, rendering multiple single-band images, and performing simple band math on the input data.

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