Landsat data has been freely available to the public since 2008. With both Landsat 8 and 9 in orbit, we can get a global coverage of the Earth once every eight days. Landsat has a temporal resolution of 16 days, meaning the same location on Earth is imaged approximately once every 16 days. If you think of pixels on a zoomed-in photo, each pixel would be 100 feet by 100 feet. In general, Landsat satellite data has a spatial resolution of about 100 feet (about 30 meters). The latest satellite in the series, Landsat 9, was launched by NASA in September 2021. ![]() Landsat: The longest-running Earth satellite mission, Landsat, has been collecting imagery of the Earth since 1972. ![]() ![]() The ones we’re interested in are Earth observation satellites, which collect images of the Earth, day and night. Others provide global positioning system (GPS) services for navigation. Some transmit and receive radio signals for communications. You can see a live map of them at keeptrack.space. There are over 8,000 satellites orbiting the Earth today. Qiusheng Wu, NOAA GOES Putting Landsat and Sentinel to work Here’s a quick tour of where you can find satellite images, plus some free, fairly simple tools that anyone can use to create time-lapse animations from satellite images.įor example, state and urban planners – or people considering a new home – can watch over time how rivers have moved, construction crept into wildland areas or a coastline eroded.Ī GOES satellite time-lapse shows the Hunga Tonga volcanic eruption on Jan. I work with geospatial big data as a professor. ![]() However, the increasing availability of open-access data from government satellites such as Landsat and Sentinel, and free cloud-computing resources such as Amazon Web Services, Google Earth Engine and Microsoft Planetary Computer, have made it possible for just about anyone to gain insight into environmental changes underway. Traditionally, access to satellite data has been limited to researchers and professionals with expertise in remote sensing and image processing. If you want to track changes in the Amazon rainforest, see the full expanse of a hurricane or figure out where people need help after a disaster, it’s much easier to do with the view from a satellite orbiting a few hundred miles above Earth.
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