Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

Monitoring Deformation

Remote sensing is a critical tool for studying volcanoes. Synthetic aperture radar (SAR), used to create the majority of the imagery available in the ASF archive, is among the power tools of remote sensing and is increasingly used to measure changes in topography caused by volcanoes. Researchers can detect land movement down to centimeters by comparing two or more images of the same location over time, a technique known as interferometric SAR, or InSAR.

SAR bounces a microwave radar signal off the Earth's surface to detect physical properties. Unlike optical technology, SAR can "see" through darkness, clouds, and rain.

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.