Sentinel-1 SAR

Free SAR Satellite Imagery Viewer Online

With Off-Nadir Delta, you can view and analyze Sentinel-1 radar imagery directly in your browser. No software installation or data downloads required.

Cloud Penetrating

Radar waves pass through clouds, ensuring imagery availability regardless of weather conditions.

Day & Night

Active radar illumination means SAR works equally well at night as during the day.

Surface Texture

SAR reveals surface texture and roughness. Smooth surfaces like water appear dark, rough surfaces appear bright.

Technical Specifications

C-Band

5.405 GHz (5.6 cm)

10m

Spatial Resolution

250 km

Swath Width

6 days

Revisit Time

Available Products

GRD (Ground Range Detected)

Multi-looked for reduced speckle. Projected to ground range using Earth ellipsoid. Available in VV and VH polarizations.

RTC (Radiometric Terrain Corrected)

Corrected for terrain distortion using a DEM. Better geometric accuracy in mountainous areas. Normalized backscatter values.

What You Can Do with Sentinel-1 in Off-Nadir Delta

Browse SAR Archive

Search and view Sentinel-1 imagery from 2014 to present

Compare Dates

Load multiple dates as layers and compare imagery over time

All-Weather Imagery

Access imagery regardless of cloud cover or lighting conditions

GRD & RTC Products

Choose between Ground Range Detected and Radiometrically Terrain Corrected products

How It Works

Navigate to Your Area

Pan and zoom to your area of interest anywhere in the world.

Search for Sentinel-1 Data

Select date range and search for available SAR imagery.

Add to Map

Click to add imagery to your map. Adjust visualization as needed.

Analyze

Compare dates, detect changes, or export for further analysis.

Frequently Asked Questions

What is Sentinel-1 SAR?▼

Sentinel-1 is a C-band radar satellite constellation from the European Space Agency (Copernicus program). SAR (Synthetic Aperture Radar) uses microwave pulses at 5.405 GHz to image the Earth, working through clouds and at night. The constellation includes Sentinel-1A (2014) and Sentinel-1C (2024), providing global coverage.

What is the resolution of Sentinel-1?▼

Sentinel-1 Interferometric Wide (IW) mode provides 5×20m resolution (10m resampled for GRD products). GRD (Ground Range Detected) products are multi-looked for reduced speckle. RTC (Radiometrically Terrain Corrected) products correct for terrain distortion using a DEM. The swath width is 250km.

How often is new data available?▼

The two-satellite constellation provides a 6-day exact repeat cycle at the equator. Higher latitudes benefit from orbit overlap with more frequent coverage. Ascending and descending passes offer different viewing geometries.

Can SAR see through clouds?▼

Yes! C-band radar waves (5.6cm wavelength) penetrate clouds, light rain, and smoke. SAR is also independent of sunlight, making it ideal for monitoring during storms, at night, and in polar winter conditions.

What can I detect with SAR?▼

SAR excels at detecting water (floods appear dark due to specular reflection), ships (bright points from metal hulls), oil spills (smooth surfaces), urban structures (corner reflectors), deforestation (texture changes), and ground deformation (using InSAR). It is critical for disaster response when clouds obscure optical sensors.

What polarizations are available?▼

Sentinel-1 IW mode provides dual polarization: VV (vertical transmit, vertical receive) and VH (vertical transmit, horizontal receive). VV is sensitive to surface roughness, while VH cross-polarization is useful for vegetation analysis and flood mapping.

Start Viewing Sentinel-1 SAR Data

Access radar satellite imagery with a free account. No software installation required.

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