%0 Conference Proceedings
%T ASTER global DEM-the Kaizen approach [abs.]
%A Abrams, M.J.
%A Tsu, H.
%A Fujisada, H.
%A Meyer, David J.
%E in
%B Imaging a sustainable future, Congress of the International Society for Photogrammetry and Remote Sensing, 22nd
%D 2012
%V Abstracts
%7 25 August-1 September 2012
%I International Society for Photogrammetry and Remote Sensing
%C Lemmer, Netherlands
%@ http://www.isprs2012.org/abstractsByAuthor.asp
%G FY 2012
%F Abrams_etal2012
%O exported from refbase (http://eros.usgs.gov/refbase/show.php?record=23326), last updated on Fri, 21 Sep 2012 11:59:54 -0500
%X The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is a 14-channel imaging instrument operating on NASAƒ_Ts Terra satellite. A joint project between the U.S. National Aeronautics and Space Administration and Japanƒ_Ts Ministry of Economy, Trade, and Industry, ASTER has been acquiring data since March 2000. The archive now contains over 2.1 million scenes; for the majority of them, a stereo pair was collected using nadir and backward telescopes imaging in the NIR wavelength. In 2007, the ASTER Science Team received a proposal from SILC (Sensor Information Laboratory Corp., Japan) to produce a global DEM (GDEM) based on stereo-correlation of 1.2 million ASTER scenes. The DEM would have 30m postings, and employ cloud masking to eliminate cloud-contaminated pixels. METI and NASA agreed to purchase the GDEM, undertook a rigorous validation effort, and released the no-charge GDEM product to the public as a provisional product in June 2009. Each order was accompanied with a summary of the validation report, describing the characteristics of the data set, anomalies discovered by the validation team, and caveats on use of the GDEM. Even though there were known anomalies in the data, NASA and METI agreed that the GDEM V1 was of sufficient quality to be of great use to the public, and additionally formally offered it to GEO as a contribution to aid societal benefits. In 2009 SILC proposed to create an updated GDEM (Version 2), that would incorporate several improvements to V1: a smaller correlation window size resulting in increased spatial resolution; improved cloud masking; improved, more accurate water body mask; and reduction of holes in the data. During the two years between production of the two versions of the GDEM, ASTER acquired an additional 260,000 scenes, many of them targeted specifically to fill holes in ASTERƒ_Ts global coverage (caused primarily by the presence of persistent clouds). A similar validation effort was undertaken in early 2011, and the public release of GDEM Version 2 was accomplished in October 2011. Again each data order was accompanied by a summary of the validation report, and a link to download the complete report. The popularity of GDEM V1 exceeded expectations: as of October 2011, over 13 million 1 x 1 degree tiles were ordered from Japan and US data distribution centers. The Science Team is considering the possibility of GDEM Version 3: an additional 200,000 stereo images would further eliminate holes and improve the quality of sparsely sampled areas; other improvements are contemplated.
%K Advanced Spaceborne Thermal Emission and Reflection Radiometer
%K aeronautics
%K anomalies
%K archive
%K area
%K ASTER
%K Australia
%K cloud
%K conference abstracts
%K correlation
%K data
%K data distribution
%K data set
%K DEM
%K DEM/DTM
%K digital camera
%K emission
%K GEO
%K global
%K global-environmental database
%K image
%K imaging
%K instrument
%K mapping
%K nadir
%K NASA
%K National Aeronautics and Space Administration
%K optical
%K photogrammetry
%K pixel
%K production
%K radiometer
%K reduction
%K reflection
%K remote sensing
%K resolution
%K satellite
%K sensor
%K societal benefit
%K spatial
%K spatial resolution
%K stereo
%K Terra
%K thermal
%K US
%K validation
%K water
%K water bodies
%K wavelength
%U http://www.isprs2012.org/abstractsByAuthor.asp