Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

Legacy-Product Content Overview

The following files are in the sample InSAR, or interferometric, product suite:

HDF5 Product:ALPSR_06713_08055_0770.h5
Browse Image:ALPSR_06713_08055_0770.jpg
XML Metadata:ALPSR_06713_08055_0770.xml
KML Overlay:ALPSR_06713_08055_0770.amp.kmz
Log File:ALPSR_06713_08055_0770.log.txt

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Product Specification Guide

The product-format specification defines the sample standard InSAR products generated at the Alaska Satellite Facility (ASF). It contains the definition for the HDF5 data container as well as the ISO compliant XML metadata.

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Viewing HDF5 Products

The sample InSAR HDF5 products are currently supported to different degrees by several software packages that can be used to investigate and visualize the data.


The commercial geographic information system ArcGIS recognizes the HDF5 structure and is able to extract the SAR data on the fly. The program does not calculate standard statistics for this data layer and is very slow in rendering the data this way. The map projection information must be manually defined. 


The Geospatial Data Abstraction Library (GDAL) helps users explore the general contents of the sample InSAR HDF5 data. The gdalinfo tool summarizes the data structure in the file.


This Java-based tool, provided by the HDF group, enables browsing and editing of HDF files.


The Interactive Data Language (IDL) provides a more programmatic means to visualize the sample InSAR HDF5 data. In a first step, users can verify that the dataset is in HDF5 format.

InSAR Processing Flow Diagram

All ASF standardized sample InSAR products have been processed with a customized version of ROI_PAC (version 3.1, revision 172). The SAR interferometric products have been terrain-corrected using a digital elevation model provided by Open Topography. In Spring 2014, tropospheric effects will be corrected using water vapor model outputs based on MODIS data provided by the Online Services for Correcting Atmosphere in Radar (OSCAR) of the Jet Propulsion Laboratory (JPL).

InSAR Synthetic Aperture Radar Processing Flow

Page last modified February 7, 2014.

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.