ASTER Satellite Data and Silcast

The global ASTER DEM version 2 (GDEM2) is available

A Global one-second (~30m) DEM mosaic, version 2, from 83S to 83N, built from 1.4 million ASTER scenes, is now available. I do not expect the 30m data spacing to be a substantial loss of data quality form the 15m product. People who want visual and IR bands will continue to order individual scenes.

This page, when complete, will discuss my experiences (helpful hints and all that) with ASTER images and the silcast program. It will will also serve as an index to my raw and processed images, making them available to everyone with whom I have permission to share. (My SILCAST prohibits distribution of products to third parties, which I take to mean those outside the University of Washington.) Anyone in the department can contact Harvey directly.

Silcast produces 15-meter DEMs (doing some oversampling) for individual images. Adjacent DEMs will not match perfectly.

As of April 1, 2016 , all ASTER scenes are free. (Nothing here has been verified since 2016.)

Go to NASA and request L1A Reconstructed Unprocessed Images. Enter the geographic range. Most people will want to specify daytime images. Click the Search button and wait 3-10 minutes for the list of matching images to appear. Make sure that your page is configured to show the cloud cover (not always accurate) for each quadrant of the image. If in doubt about coverage, open the browse image in another tab. Check the images you want and continue to the next page. Click on ordering options and select FTPpull. Files are available as hdf or geotiff. I have been downloading as hdf, as I have never tried geotiff as input to silcast.

Files will typically be available for download in several hours. The name of the file begins with LA1_003, followed by the date and time of image acquisition, following by the date and time of processing. There will be a binary .hdf file and an ascii .met metadata file.

We in ESS are fortunate in having a license to process these files in house. To process the raw files, you need

We are giving up on our old silcast software when we transition to Windows10 in August We will insstall the demo version of silcast on a newer machine, and will look into a license purchase on request.

Tips for the old software

Files at the University of Washington Department of Earth and Space Sciences

Contact Harvey to access these files, within the bounds of ASTER and SILCAST licensing. More observations

Web Curator: Harvey Greenberg . . . . . about this site . . . . . What's New . . . .sorry