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The influence of patch-delineation mismatches on multi-temporal landscape pattern analysis 总被引:3,自引:0,他引:3
Julia Linke Gregory J. McDermid Alysha D. Pape Adam J. McLane David N. Laskin Mryka Hall-Beyer Steven E. Franklin 《Landscape Ecology》2009,24(2):157-170
Investigations of land-cover change often employ metrics designed to quantify changes in landscape structure through time,
using analyses of land cover maps derived from the classification of remote sensing images from two or more time periods.
Unfortunately, the validity of these landscape pattern analyses (LPA) can be compromised by the presence of spurious change, i.e., differences between map products caused by classification error rather than real changes on the ground. To reduce
this problem, multi-temporal time series of land-cover maps can be constructed by updating (projecting forward in time) and
backdating (projecting backward in time) an existing reference map, wherein regions of change are delineated through bi-temporal
change analysis and overlaid onto the reference map. However, this procedure itself creates challenges, because sliver patches can occur in cases where the boundaries of the change regions do not exactly match the land-cover patches in the reference
map. In this paper, we describe how sliver patches can inadvertently be created through the backdating and updating of land-cover
maps, and document their impact on the magnitude and trajectory of four popular landscape metrics: number of patches (NP),
edge density (ED), mean patch size (MPS), and mean shape index (MSI). In our findings, sliver patches led to significant distortions
in both the value and temporal behaviour of metrics. In backdated maps, these distortions caused metric trajectories to appear
more conservative, suggesting lower rates of change for ED and inverse trajectories for NP, MPS and MSI. In updated maps,
slivers caused metric trajectories to appear more extreme and exaggerated, suggesting higher rates of change for all four
metrics. Our research underscores the need to eliminate sliver patches from any study dealing with multi-temporal LPA. 相似文献
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