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Open AccessTechnical Note

Technical Methodology for ASTER Global Water Body Data Base

1
Sensor Information Laboratory Corp, 2-23-36 Shihaugaoka, Tsukubamirai, Ibaraki 300-2359, Japan
2
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
3
Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1, Komaba, Meguro, Tokyo 153-8904, Japan
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(12), 1860; https://doi.org/10.3390/rs10121860
Received: 3 October 2018 / Revised: 31 October 2018 / Accepted: 16 November 2018 / Published: 22 November 2018
(This article belongs to the Special Issue ASTER 20th Anniversary)
A waterbody detection technique is an essential part of a digital elevation model (DEM) generation to delineate land–water boundaries and set flattened elevations. This paper describes the technical methodology for improving the initial tile-based waterbody data that are created during production of the Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) GDEM, because without improvement such tile-based waterbodies data are not suitable for incorporating into the new ASTER GDEM Version 3. Waterbodies are classified into three categories: sea, lake, and river. For sea-waterbodies, the effect of sea ice is removed to better delineate sea shorelines in high latitude areas: sea ice prevents accurate delineation of sea shorelines. For lake-waterbodies, the major part of the processing is to set the unique elevation value for each lake using a mosaic image that covers the entire lake area. Rivers present a unique challenge, because their elevations gradually step down from upstream to downstream. Initially, visual inspection is required to separate rivers from lakes. A stepwise elevation assignment, with a step of one meter, is carried out by manual or automated methods, depending on the situation. The ASTER global water database (GWBD) product consists of a global set of 1° latitude-by-1° longitude tiles containing water body attribute and elevation data files in geographic latitude and longitude coordinates and with one arc second posting. Each tile contains 3601-by-3601 data points. All improved waterbody elevation data are incorporated into the ASTER GDEM to reflect the improved results. View Full-Text
Keywords: ASTER instrument; stereo; digital elevation model; global database; optical sensor; water body detection ASTER instrument; stereo; digital elevation model; global database; optical sensor; water body detection
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Fujisada, H.; Urai, M.; Iwasaki, A. Technical Methodology for ASTER Global Water Body Data Base. Remote Sens. 2018, 10, 1860.

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