DOI: 10.1016/j.jag.2017.10.007
Scopus记录号: 2-s2.0-85036593914
论文题名: Using GPS-surveyed intertidal zones to determine the validity of shorelines automatically mapped by Landsat water indices
作者: Kelly J ; T ; , Gontz A ; M
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2018
卷: 65 起始页码: 92
结束页码: 104
语种: 英语
英文关键词: Brazil
; Coastal change
; Geomorphology
; Massachusetts
; Remote sensing
; Satellite imagery
Scopus关键词: coastal zone
; geomorphology
; GPS
; intertidal environment
; Landsat
; mapping
; remote sensing
; satellite imagery
; shoreline
; Brazil
; Massachusetts
; United States
英文摘要: Satellite remote sensing has been used extensively in a variety of shoreline studies and validated using aerial photography. This ground truth method only represents an instantaneous depiction of the shoreline at the time of acquisition and does not take into account the spatial and temporal variability of the dynamic shoreline boundary. Landsat 8′s Operational Land Imager sensor's capability to accurately delineate a shoreline is assessed by comparing all known Landsat water index-derived shorelines with two GPS-surveyed intertidal zones that coincide with the satellite flyover date, one of which had near-neap tide conditions. Seven indices developed for automatically classifying water pixels were evaluated for their ability to delineate shorelines. The shoreline is described here as the area above and below maximum low and high tide, otherwise known as the intertidal zone. The high-water line, or wet/dry sediment line, was chosen as the shoreline indicator to be mapped using a handheld GPS. The proportion of the Landsat-derived shorelines that fell within this zone and their alongshore profile lengths were calculated. The most frequently used water index and the predecessor to Modified Normalized Difference Water Index (MNDWI), Normalized Difference Water Index (NDWI), was found to be the least accurate by a significant margin. Other indices required calibration of their threshold value to achieve accurate results, thus diminishing their replicability success for other regions. MNDWI was determined to be the best index for automated shoreline mapping, based on its superior accuracy and repeatable, stable threshold value. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79899
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geological Sciences, San Diego State University, 5500 Campanile Drive, San Diego, CA, United States; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA, United States
Recommended Citation:
Kelly J,T,, Gontz A,et al. Using GPS-surveyed intertidal zones to determine the validity of shorelines automatically mapped by Landsat water indices[J]. International Journal of Applied Earth Observation and Geoinformation,2018-01-01,65