Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

Types of Synthetic Aperture Radar (SAR) Products

New users may prefer to start with imagery and products derived from imagery. These products are given processing-level numbers, such as L1 and L2. Raw, unprocessed data, is L0 or L1.0.

TypeLevelPresentationTools to ViewTool Source

Raw Data

L0, L1.0, Raw

UnfocusedUser must processn/a

Single look complex

L1.1, SLCFocused but speckled

Contains phase information.

Used for InSAR



L1, L1.5*

Ground Range Detected (GRD)

Viewable image

ASF View/ MapReady

ESA Sentinel Toolbox (S1TBX)

ASF, no cost to users

ESA, no cost to users


Corrected imagery



Viewable Image


Note: Dark RTC images may require conversion from gamma0 to sigma0 in GIS for best viewing. Instructions.

ArcMap - commercial, QGIS - free
Product derived from imagesL2 - OCNUsually a viewable image or plotUsually nonen/a

*Radiometrically terrain-corrected (RTC) is corrected L1.5 imagery.

Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.