Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

Pre-processingPre-processingPre-processingPre-processingPre-processing

Cleaning and processing the original Seasat telemetry data presented challenges ranging from bit rot and data discontinuities to conflicting time records. Each step involved writing new software. When the telemetry data filtering was finished in the spring of 2013, 1,346 raw Seasat swaths were ready to be processed into SAR image products. Engineers then turned their attention to the processing itself, and released beta products to commemorate the 35th anniversary of Seasat’s launch.

The following pages give an overview of the raw data preparation or pre-processing, image processing and product packaging. It is important to note that several data quality issues do exist in the resulting products — including imprecise geolocations and some image anomalies. There are some visualization tools that work with ASF's Seasat HDF5 products. Links throughout this overview take users to more detailed descriptions within the Processing Challenges section.

Earth Highlight TopEarth Highlight Top
Grays Harbor and Willapa Bay in Washington State.  ASF Granule SS_00638_STD_F0928 captured August 10, 1978. © NASA.Grays Harbor and Willapa Bay in Washington State. ASF Granule SS_00638_STD_F0928 captured August 10, 1978. © NASA.
Mouth of the Columbia River and the Oregon coastline. ASF Granule SS_00638_STD_F0914 captured August 10, 1978. © NASAMouth of the Columbia River and the Oregon coastline. ASF Granule SS_00638_STD_F0914 captured August 10, 1978. © NASA
The North Sea off the coast of England. View full image to see two boats and their wakes in the top half of the image. ASF Granule SS_00785_STD_F2511 captured August 20, 1978. © NASA.The North Sea off the coast of England. View full image to see two boats and their wakes in the top half of the image. ASF Granule SS_00785_STD_F2511 captured August 20, 1978. © NASA.
A scene from northeast Russia. ASF granule SS_00492_STD_F2241 collected August 20, 1978. © NASA.A scene from northeast Russia. ASF granule SS_00492_STD_F2241 collected August 20, 1978. © NASA.
A scene from Teepee Park, Yukon, Canada. ASF granule SS_00351_STD_F1224 collected July 21, 1978. © NASA.A scene from Teepee Park, Yukon, Canada. ASF granule SS_00351_STD_F1224 collected July 21, 1978. © NASA.
Isla Cedros, Baja California. ASF Granule SS_00351_STD_F0556 collected July 21, 1978. © NASA.Isla Cedros, Baja California. ASF Granule SS_00351_STD_F0556 collected July 21, 1978. © NASA.
Uncle Sam Bank, Pacific Ocean, Baja California. View full image to see a boat as a small white dot in the upper right quadrant. ASF Granule SS_00351_STD_F0499 collected July 21, 1978. © NASA.Uncle Sam Bank, Pacific Ocean, Baja California. View full image to see a boat as a small white dot in the upper right quadrant. ASF Granule SS_00351_STD_F0499 collected July 21, 1978. © NASA.
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.