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Las Vegas is on the left in this detail of the Seasat sample granule provided with this recipe.

Las Vegas is on the left in this detail of the Seasat sample granule provided with this recipe. 

Credit: NASA 1978, processed by ASF DAAC 2013. 

Background

To distribute digitally processed 1978 Seasat SAR data in 2013, engineers used the most recent version of the Hierarchical Data Format, or HDF5 file format. These Seasat HDF5 files are viewable using the ASF MapReady image processing software. Each HDF5 file consists of a metadata group and a data group, which contain the SAR data as backscatter values in the HH layer, as well as latitude, longitude, and temporal data.

Seasat data had been archived on magnetic tapes, and images processed from the tapes were available only as optical images of film strips or scanned digital images. Neither the tapes nor the film allow the quantitative analysis possible with the new digital archive.

Prerequisites

Materials List:

  • Windows PC
  • ASF MapReady
  • HDF5-format Seasat Granule or Sample Granule
Las Vegas Sample Granule

The sample granule shows Las Vegas in the upper left of a Seasat image of parts of Nevada and Arizona. The white vertical line is from a calibration pulse.

Credit NASA 1978, processed by ASF DAAC 2013.
 

Steps

Download Materials

  1. Download ASF’s MapReady
  2. Install MapReady using the Installation Wizard
  3. Download an HDF5-formatted data granule from the Seasat collection using Vertex, or use the Sample Granule.
  4. Create a working directory and extract the .zip file

View Data

Option 1 — ASF View

  1. Click on the Windows Start button
  2. Open ASF View
  3. Click on Open File… (1) and navigate to the folder that contains the Seasat file you downloaded
  4. Click to expand the file type menu in the bottom-right corner and select All Files (2)
  5. Then select the .h5 file and click Open (3), in which the Seasat image and metadata will be displayed
Navigate ASF View to see the HDF5-format Seasat granule.

Navigate ASF View to see the HDF5-format Seasat granule.

Viewing the sample granule in ASF View, which is part of the MapReady tool suite

Viewing the sample granule in ASF View, which is part of the MapReady tool suite
 

Option 2 — ASF MapReady

  1. Open ASF MapReady
  2. In the Input Files section, click the button to Add: (1) to expand the menu, then select SEASAT H5 (2)
  3. Click on the Browse… button (3) and navigate to the folder with the Seasat file you downloaded
  4. Select the .h5 file and click Open (4)
  5. The Seasat file will be displayed in the Input File window
  6. Click on the viewer button in the toolbar to view the file
  7. The image will open in ASF View, a viewer application which can also display CEOS-format data and many other image-processing formats.

Hint: Press the End key on your keyboard to zoom out and view the entire image

Screenshot showing the navigation steps

Navigate to select Seasat H5 data.

Screenshot showing the navigations steps

Navigate to view Seasat H5 data through ASF View

Details

Last Updated

Published on

Author

ASF Staff

Data Centers

Alaska Satellite Facility DAAC (ASF DAAC)