Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

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Why Phase Unwrap an Interferogram

Adapted from ESA


While an interferogram's fringes show topography or deformation, the height change between fringes is ambiguous. The phase is only known within 2π. Phase unwrapping resolves the uncertainty and allows displacement values to be derived from the product.

This recipe is a follow-on to the 'Generate InSAR with Sentinel-1 Toolbox' recipe. In order to complete this recipe with the data provided, you must first go through the steps of the aforementioned recipe.

Phase image of the 2016 Kumamoto Earthquake show clearly after multlooking and phase filtering were applied.

The unwrapped phase image above of the 2016 Kumamoto Earthquake shows displacement clearly after multi-looking and phase filtering were applied. Contains modified Copernicus Sentinel data 2016, processed by ESA.

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.