# Sentinel-1 GRD IW
*data products*

## Specifications
- **level**: L1
- **distributor**: esa
- **gsd m**: {"native":10}
- **file format**: SAFE (original) / COG_SAFE (Cloud Optimized GeoTIFF, June 2023 onward)
- **access endpoint**: https://catalogue.dataspace.copernicus.eu/odata/v1/
- **access model**: open
- **licence**: Copernicus Sentinel Data Legal Notice (free, full, open access)
- **primary data portal url**: https://browser.stac.dataspace.copernicus.eu/
- **use cases**: ["Deforestation monitoring (RADD, tropical forest disturbance alerts)","Ship detection over ocean via VV backscatter change","Emergency response (flood, landslide, post-event damage assessment)","Land cover change and biomass cross-reference","Foundation for InSAR studies (note SLC is the InSAR product; GRD is amplitude only)"]
- **practical limitations**: ["Phase information removed; not suitable for InSAR (use SLC for interferometry)","10 m GRD pixel spacing sourced at tier 3 in this research pass; ESA product specification PDF was inaccessible and tier 1 confirmation pending Phase 3","Number-of-looks for IW GRD HS commonly cited around 4.4 ENL but not confirmed at tier 1 or tier 2","GRD HS variant (10 m) is the dominant distribution; MD variant (40 m) also exists with the same processing chain"]
- **known artefacts**: ["TOPSAR burst-mode artefacts can manifest as scalloping if multi-look filtering is insufficient at sub-swath boundaries","Speckle is inherent to SAR; multi-looking in GRD reduces it but does not eliminate it"]
- **last verified date**: "2026-05-18T00:00:00.000Z"
- **verified by**: agency-doc
- **claim status**: agency-verified
- **deployment context**: orbital

## Compositional position
- defor (topics) --[topic_capabilities]--> Sentinel-1 GRD IW

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Source: https://eo-atlas.org/data_products/sentinel-1-grd-iw
Maintainer: SpectraWorks B.V. (CC-BY 4.0)