The original imagery was sourced from NOAA's National Geodetic Survey, before being converted and served at tile.intrinsical.de in OSM-style TMS format as JPEGs, via IPv6 & IPv4, in both HTTPS & HTTP.
More imagery is being added regularly. If you would like to get any fast-tracked, please contact me on OpenStreetMap. Please also drop a message if you find an issue with the imagery or tiles.
RGB indicates the imagery is a typical visible-light image, including a red band, a green band, and a blue band.
NRG indicates the imagery is a false-color representation including a near-infrared band, a red band, and a green band, remapped to an RGB color-space.