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ArcGIS Online (https://www.arcgis.com/home/index.html) serves a huge array of imagery datasets for visualization with some imagery also dynamically served across the web and available for analysis. ArcGIS Online is perhaps the most comprehensive and best-organized source for cached worldwide imagery served online. Hundreds of datasets are available for most of the world that include a rich variety of imagery types from high-spatial-resolution, true color world imagery collected by commercial companies, to low-spatial-resolution weather data from NOAA, to images of global ozone and precipitation from NASA. Esri also dynamically serves the pixel values of several sources of imagery including NAIP and Landsat 8.

Table 4.1. Comparison of the major sources of imagery