![]() ![]() For low resolution requests (many meters per pixel) increasing it to 3, for example, can be worthwhile to reduce artifacts. The DEM oversampling parameter is by default set to 2 and can be user adjusted. Radiometric terrain correction can only be performed if orthorectification is enabled.The areas of border noise are not displayed by Sentinel Hub.Non-realtime products typically contain restituted orbit information. We find these more than sufficient for GRD use. The orbit files used are the ones bundled in the products themselves.(Optional) Orthorectification using Range-Doppler terrain correction using the Mapzen or Copernicus DEM.The Mapzen or Copernicus DEM is used (see the example). (Optional) Radiometric terrain correction using area integration is performed.(Optional) Speckle filtering on the source data (see the example).Calibration to the chosen backscatter coefficient and thermal noise removal applied.Original or multilooked source chosen (depending on the resolution level multilooking is done in ground range.For information on how to set processing parameters, see Processing Options. The following describes the way Sentinel-1 GRD data is processed in Sentinel Hub. The Sentinel products are released under the license available here. ![]() The full archive of observation scenarios is available. Below is an example of observation scenario but it may vary through time depending on requirements. When searching for the data the observation scenario can be helpful when selecting a combination of values of different parameters. Observation scenario defines the acquisition mode and polarization with which the Sentinel-1 will acquire data over certain area. See other Sentinel-1 products offered by ESA. Sentinel Hub currently supports Sentinel-1 Level-1 GRD (Ground Range Detected) products only. Thus, between Decemand the launch of a new satellite, only data from Sentinel-1A is available, which means some areas lost coverage completely, and many others have longer revisit times. ESA also plans to launch Sentinel-1C in the second quarter of 2023, a process typically followed by 3-6 months of the calibration process. Note: On December 23, 2021, one of the two satellites - Sentinel-1B - encountered an anomaly of the power unit, causing SAR functionality to be lost, and the satellite will be intentionally deorbited in the future. Main applications are for monitoring sea ice, oil spills, marine winds, waves & currents, land-use change, land deformation among others, and to respond to emergencies such as floods and earthquakes. The Sentinel-1 imagery is provided by two (see the note below) polar-orbiting satellites, operating day and night performing C-band synthetic aperture radar imaging, enabling them to acquire imagery regardless of the weather. About Sentinel-1 GRD Data Mission Information ![]()
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