ASTER Expedited Data - L1AE, L1BE

Version 1.00, September 2001

This is the initial version of the Expedited L1AE and L1BE data products created from ASTER Expedited Level-0, and is a VALIDATED product.

Table of Contents

1. Where to get detailed information on this product
2. How to report problems
3. Description of this version
* Changes
* Product Quality
* Problems and limitations
4. Version history

1. Where to get detailed information on this product

There are several sources of information that users will find useful:

* US ASTER Website. Describes the ASTER instrument, how to obtain data, the various data products that are available, the activities of the US ASTER Science Team, etc.

http://asterweb.jpl.nasa.gov/

* Level 1 product information. Because the Digital Elevation Model product is derived from a Level 1 product, understanding the L1 products is useful.

Level 1 ATBD available at: http://eospso.gsfc.nasa.gov/eos_homepage/for_scientists/atbd/viewInstrument.php?instrument=24

Level 1 User Guide available at: http://www.science.aster.ersdac.or.jp/en/index.html

2. How to report problems

To report a problem with the product, please send mail to edc@eos.nasa.gov or call EDC DAAC User Services at (605) 594-6116 or (866) 573-3222 (toll-free)

3. Description of this version

Expedited Data, L1AE and L1BE

Changes

Initial Release

Product Quality

This product has been examined and validated by JPL and EDC; it was found to be free of any major problems. Minor problems or characteristics are described below.

Problems and Limitations

ASTER Expedited Data differs from data processed via the normal pathway in several respects. These differences result from differences in the information available at the time of processing, and include the following:

1. Inter-telescope registration quality may be lower than that of the regular data. This is because regular data are surrounded by 13 adjacent scenes to ensure sufficient information for inter-telescope registration. However, these 13 adjacent scenes are not transmitted via the expedited pathway, and so are not available.

2. Expedited data have no Data Acquisition Request (DAR) ID (a unique identifier that associates a DAR request to the specific scenes that are acquired)

3. TIR data quality will be lower than that of the regular data because TIR short-term calibration is not available. Instead, the long-term calibration is used.

4. Stereo data is not available since expedited data have no band 3b

5. The geometry of L1BE scenes is slightly different than L1B because the expedited processing uses the raw spacecraft ephemeris data, and the L1B processing uses the refined (post-processed) ephemeris data.

6. Expedited data are maintained in the archive for a period of 30 days, and are then deleted after the standard processed version is received from the Japanese GDS.

4. Version History

Initial Release