What is satellite imagery and what are the sources (Sentinel, Landsat, Maxar)?
sobes.tech AI
Answer from AI
Satellite imagery — these are images of the Earth's surface obtained via satellites. They are widely used in geospatial analysis, environmental monitoring, agriculture, urban planning, and other fields.
Main sources of satellite data:
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Sentinel — a series of satellites from the European Space Agency (ESA), providing data with high update frequency and various spectral ranges. For example, Sentinel-2 offers multispectral images with a resolution of up to 10 meters.
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Landsat — a program by NASA and USGS that provides an archive of data from the 1970s. Landsat offers multispectral images with a resolution of about 30 meters, making them valuable for long-term change monitoring.
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Maxar (DigitalGlobe) — a commercial provider of high-quality satellite images with high spatial resolution (up to 30 cm). Used for detailed analysis and commercial applications.
Each source has its features regarding resolution, imaging frequency, and spectral ranges, which influence the choice of data for specific tasks in machine learning and analysis.