urn:eop:VITO:CGS_S1_GRD_SIGMA0_L1 Spaceborne Level 1-3 Imagery Flemish Institute for Technological Research (VITO) Boeretang 200 Mol 2400 Belgium helpdeskticket@vgt.vito.be https://www.vito-eodata.be/ HTTPS VITO Product Distribution Portal VITO EO Data Product Distribution Portal Office hours, 7 days per week Preferrably by e-mail 2019-08-27T11:14:44 ISO19115 2003/Cor.1:2006 https://www.opengis.net/def/crs/EPSG/0/4936 INSPIRE RS registry Sentinel-1 Level-1 Ground Range Detected (GRD) SIGMA0 products. 2018-10-10 V001 2017-01-01 Flemish Institute for Technological Research (VITO) 2017-06-15 urn:eop:VITO:CGS_S1_GRD_SIGMA0_L1 https://sentinels.copernicus.eu/web/sentinel/user-guides/sentinel-1-sar/product-types-processing-levels/level-1 The Sigma0 product describes how much of the radar signal that was sent out by Sentinel-1 is reflected back to the sensor, and depends on the characteristics of the surface. This product is derived from the L1-GRD product. Typical SAR data processing, which produces level 1 images such as L1-GRD product, does not include radiometric corrections and significant radiometric bias remains. Therefore, it is necessary to apply the radiometric correction to SAR images so that the pixel values of the SAR images truly represent the radar backscatter of the reflecting surface. The radiometric correction is also necessary for the comparison of SAR images acquired with different sensors, or acquired from the same sensor but at different times, in different modes, or processed by different processors. For this Sigma0 product, radiometric calibration was performed using a specific Look Up Table (LUT) that is provided with each original GRD product. This LUT applies a range-dependent gain including the absolute calibration constant, in addition to a constant offset. Next to calibration, also orbit correction, border noise removal, thermal noise removal, and range doppler terrain correction steps were applied during production of Sigma0. The terrain correction step is intended to compensate for distortions due to topographical variations of the scene and the tilt of the satellite sensor, so that the geometric representation of the image will be as close as possible to the real world. The Level1 GRD product can be useful for Land monitoring and Emergency management. This product is provided by the VITO TERRASCOPE Project funded by BELSPO (Belgian Science Policy). Flemish Institute of Technological Research (VITO) - Belgium Helpdesk Boeretang 200 Mol 2400 Belgium helpdeskticket@vgt.vito.be https://www.vito-eodata.be/ HTTPS VITO Product Distribution Portal VITO EO Data Product Distribution Portal Office hours, 7 days per week Preferrably by e-mail https://docs.terrascope.be/DataProducts/collections/QUICKLOOKS/SENTINEL1_GRD_QL.JPG Example quicklook of Sentinel-1 GRD product. JPEG SAFE v1 SAFE processing Eionet GEMET Thesaurus 2011-09-12 C-SAR Sentinel-1A Sentinel-1B Sentinel-1 RADAR BACKSCATTER RADAR no conditions apply no limitations Sentinel-1 2017-06-15 C-SAR 2017-06-15 10 eng imageryBaseMapsEarthCover -1.0589250737672506 11.678098693553778 47.66030548053927 53.67487358198095 Single scenes Day 2014-10-03T00:00:00 2029-10-03T23:59:00 https://www.vito-eodata.be/ GeoTIFF 1.0 geoTIFF VITO VITO Helpdesk Boeretang 200 Mol 2400 Belgium helpdeskticket@vgt.vito.be https://www.vito-eodata.be/ HTTPS VITO Product Distribution Portal VITO EO Data Product Distribution Portal Office hours, 7 days per week Preferrably by e-mail Free to download Products can be download from www.vito-eodata.be after registration https://services.terrascope.be/catalogue/description HTTPS TERRASCOPE Catalogue Search and download datasets using the VITO TERRASCOPE OpenSearch CAtalogue for Remote Sensing Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 See the referenced specification true The Sigma0 product describes how much of the radar signal that was sent out by Sentinel-1 is reflected back to the sensor, and depends on the characteristics of the surface. This product is derived from the L1-GRD product. Typical SAR data processing, which produces level 1 images such as L1-GRD product, does not include radiometric corrections and significant radiometric bias remains. Therefore, it is necessary to apply the radiometric correction to SAR images so that the pixel values of the SAR images truly represent the radar backscatter of the reflecting surface. The radiometric correction is also necessary for the comparison of SAR images acquired with different sensors, or acquired from the same sensor but at different times, in different modes, or processed by different processors. For this Sigma0 product, radiometric calibration was performed using a specific Look Up Table (LUT) that is provided with each original GRD product. This LUT applies a range-dependent gain including the absolute calibration constant, in addition to a constant offset. Next to calibration, also orbit correction, border noise removal, thermal noise removal, and range doppler terrain correction steps were applied during production of Sigma0. The terrain correction step is intended to compensate for distortions due to topographical variations of the scene and the tilt of the satellite sensor, so that the geometric representation of the image will be as close as possible to the real world.