# Sentinel-1 imagery

https://sentinel.esa.int/web/sentinel/missions/sentinel-1

The Sentinel-1 mission is the European Radar Observatory for the Copernicus joint initiative of the European Commission (EC) and the European Space Agency (ESA). The Sentinel-1 mission includes C-band imaging operating in four exclusive imaging modes with different resolution (down to 5 m) and coverage (up to 400 km). It provides dual polarization capability, very short revisit times and rapid product delivery. Synthetic Aperture Radar (SAR) has the advantage of operating at wavelengths not impeded by cloud cover or a lack of illumination and can acquire data over a site during day or night time under all weather conditions. Sentinel-1, with its C-SAR instrument, can offer reliable, repeated wide area monitoring. Sentinel-1 is designed to work in a pre-programmed, conflict-free operation mode, imaging all global landmasses, coastal zones and shipping routes at high resolution and covering the global ocean with vignettes. This ensures the reliability of service required by operational services and a consistent long term data archive built for applications based on long time series.

Beam ID	IW1	IW2	IW3
Spatial Resolution rg x az m	20.4x22.5	20.3x22.6	20.5x22.6
Pixel spacing rg x az m	10x10	10x10	10x10
Incidence angle °	32.9	38.3	43.1
Equivalent Number of Looks (ENL)	4.4	4.3	4.3
Radiometric resolution	1.7	1.7	1.7
Range look bandwidth MHz	14.1	12.1	10.7
Azimuth look bandwidth Hz	315	301	301
Range Hamming weighting coefficient	0.70	0.73	0.75
Azimuth Hamming weighting coefficient	0.70	0.75	0.75

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