DOI: 10.1016/j.jag.2017.07.013
Scopus记录号: 2-s2.0-85032470971
论文题名: Updating Landsat time series of surface-reflectance composites and forest change products with new observations
作者: Hermosilla T ; , Wulder M ; A ; , White J ; C ; , Coops N ; C ; , Hobart G ; W
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2017
卷: 63 起始页码: 104
结束页码: 111
语种: 英语
英文关键词: Change detection
; Forest
; Image compositing
; Landsat
; Monitoring
Scopus关键词: environmental monitoring
; forest dynamics
; Landsat
; landscape change
; observational method
; satellite data
; satellite imagery
; surface reflectance
; time series analysis
英文摘要: The use of time series satellite data allows for the temporally dense, systematic, transparent, and synoptic capture of land dynamics over time. Subsequent to the opening of the Landsat archive, several time series approaches for characterizing landscape change have been developed, often representing a particular analytical time window. The information richness and widespread utility of these time series data have created a need to maintain the currency of time series information via the addition of new data, as it becomes available. When an existing time series is temporally extended, it is critical that previously generated change information remains consistent, thereby not altering reported change statistics or science outcomes based on that change information. In this research, we investigate the impacts and implications of adding additional years to an existing 29-year annual Landsat time series for forest change. To do so, we undertook a spatially explicit comparison of the 29 overlapping years of a time series representing 1984–2012, with a time series representing 1984–2016. Surface reflectance values, and presence, year, and type of change were compared. We found that the addition of years to extend the time series had minimal effect on the annual surface reflectance composites, with slight band-specific differences (r ≥ 0.1) in the final years of the original time series being updated. The area of stand replacing disturbances and determination of change year are virtually unchanged for the overlapping period between the two time-series products. Over the overlapping temporal period (1984–2012), the total area of change differs by 0.53%, equating to an annual difference in change area of 0.019%. Overall, the spatial and temporal agreement of the changes detected by both time series was 96%. Further, our findings suggest that the entire pre-existing historic time series does not need to be re-processed during the update process. Critically, given the time series change detection and update approach followed here, science outcomes or reports representing one temporal epoch can be considered stable and will not be altered when a time series is updated with newly available data. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80003
Appears in Collections: 气候变化事实与影响
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作者单位: Integrated Remote Sensing Studio, Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC, Canada; Canadian Forest Service (Pacific Forestry Centre), Natural Resources Canada, 506 West Burnside Road, Victoria, BC, Canada
Recommended Citation:
Hermosilla T,, Wulder M,A,et al. Updating Landsat time series of surface-reflectance composites and forest change products with new observations[J]. International Journal of Applied Earth Observation and Geoinformation,2017-01-01,63