satelitdata

Satelitdata refers to data collected by artificial satellites and the products derived from such observations. It covers raw sensor measurements and processed outputs used for Earth observation, weather forecasting, climate monitoring, navigation, and space research. The data are produced by space agencies and private companies and distributed through online catalogs and data portals.

Common satellite data types include optical imagery from multispectral sensors (red, green, blue, near-infrared), radar imagery from synthetic aperture radar (SAR), and various measurements such as altimetry (sea surface height) and atmospheric sounding. Optical data are affected by clouds and lighting conditions, while SAR can operate day or night and through clouds.

Major providers and accessibility: government programs such as NASA's Landsat and MODIS, ESA's Sentinel missions, JAXA's ALOS and others, along with commercial operators like Planet, Maxar, and Airbus. Open data policies provide broad access, while some datasets require licenses. Data are distributed in formats like GeoTIFF, HDF5, and NetCDF, with metadata conforming to standards such as ISO 19115 and Open Geospatial Consortium specifications.

Data products are released at different processing levels, from L0 raw measurements to L1 radiometrically and geometrically corrected data, L2 geophysical or geolocated products, L3 gridded fields, and L4 and beyond that provide higher-level analyses. Interoperability is aided by standards such as STAC catalogs and common coordinate reference systems.

Applications include land use and land cover mapping, agriculture and forestry monitoring, urban planning, water resource management, disaster response, and climate research. Limitations include limited temporal or spatial resolution for some regions, cloud cover for optical data, latency in open data streams, and licensing constraints for commercial products.