Preprint Article Version 1 This version is not peer-reviewed

Technical Methodology for ASTER Global Water Body Data Base

Version 1 : Received: 3 October 2018 / Approved: 3 October 2018 / Online: 3 October 2018 (17:01:08 CEST)

A peer-reviewed article of this Preprint also exists.

Fujisada, H.; Urai, M.; Iwasaki, A. Technical Methodology for ASTER Global Water Body Data Base. Remote Sens. 2018, 10, 1860. Fujisada, H.; Urai, M.; Iwasaki, A. Technical Methodology for ASTER Global Water Body Data Base. Remote Sens. 2018, 10, 1860.

Journal reference: Remote Sens. 2018, 10, 1860
DOI: 10.3390/rs10121860

Abstract

A waterbody detection technique is an essential part of 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 ASTER GDEM, because without improvement such tile-based waterbody 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, because 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 GWBD product consists of a global set of 1º latitude-by-1º 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.

Subject Areas

ASTER instrument, stereo, digital elevation model, global database, optical sensor, water body detection.

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