real-time

Near-real-time satellite imagery is common: Landsat 8 images can appear within seconds of downlink, NASA Worldview layers update within about 3 hours, and geostationary weather satellites refresh every 5–15 minutes. The ISS HD Earth Viewing Experiment streams live video of Earth from about 400 km up with roughly 1-second latency, and the view shifts as the station orbits about 16 times per day. NOAA’s Earth in Real-Time weather map updates GOES-East and GOES-West every 5 minutes for cloud imagery, with full-hemisphere views about every 15 minutes and resolutions around 0.5–2 km. NASA Worldview offers more than 1,000 imagery layers updated