Philibert2008447

Référence

Philibert, M.D., Fortin, M.-J. and Csillag, F. (2008) Spatial structure effects on the detection of patches boundaries using local operators. Environmental and Ecological Statistics, 15(4):447-467. (Scopus )

Résumé

Landscapes exhibit various degrees of spatial heterogeneity according to the differential intensity and interactions among processes and disturbances that they are subjected to. The management of these spatially dynamical landscapes requires that we can accurately map them and monitor the evolution of their spatial arrangement through time. Such a mapping requires first the delineation of various spatial features present in the landscape such as patches and their boundaries. However, there are several environmental (spatial variability) as well as technical (spatial resolution) factors that impair our ability to accurately delineate patches and their boundaries as polygons. Here, we investigate how the spatial structure and spatial resolution of the data affect the accuracy of detecting patches and their boundaries over simulated landscapes and real data. Simulated landscapes consisted of two patches with parameterized spatial properties (patches' level of spatial autocorrelation, mean value and variance) separated by a boundary of known location. Real data allowed the investigation of a more complex landscape where there is a known transition between two forest domains with unknown spatial properties. Boundary locations are defined using the lattice-wombling edge detector at various aggregation levels and the degree of patch homogeneity is determined using Getis-Ord's G*. Results show that boundary detection using a local edge detector is greatly affected by the spatial conditions of the data, namely variance, abruptness of the spatial gradient between two patches and patches' level of spatial autocorrelation. They also suggest that data aggregation is not a panacea for bringing out the ecological process creating the patches and that indicators derived from local measures of spatial association can be complementary tools for analysing spatial structures affecting boundary delineation. © Springer Science+Business Media, LLC 2007.

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@ARTICLE { Philibert2008447,
    AUTHOR = { Philibert, M.D. and Fortin, M.-J. and Csillag, F. },
    TITLE = { Spatial structure effects on the detection of patches boundaries using local operators },
    JOURNAL = { Environmental and Ecological Statistics },
    YEAR = { 2008 },
    VOLUME = { 15 },
    NUMBER = { 4 },
    PAGES = { 447-467 },
    NOTE = { cited By 10 },
    ABSTRACT = { Landscapes exhibit various degrees of spatial heterogeneity according to the differential intensity and interactions among processes and disturbances that they are subjected to. The management of these spatially dynamical landscapes requires that we can accurately map them and monitor the evolution of their spatial arrangement through time. Such a mapping requires first the delineation of various spatial features present in the landscape such as patches and their boundaries. However, there are several environmental (spatial variability) as well as technical (spatial resolution) factors that impair our ability to accurately delineate patches and their boundaries as polygons. Here, we investigate how the spatial structure and spatial resolution of the data affect the accuracy of detecting patches and their boundaries over simulated landscapes and real data. Simulated landscapes consisted of two patches with parameterized spatial properties (patches' level of spatial autocorrelation, mean value and variance) separated by a boundary of known location. Real data allowed the investigation of a more complex landscape where there is a known transition between two forest domains with unknown spatial properties. Boundary locations are defined using the lattice-wombling edge detector at various aggregation levels and the degree of patch homogeneity is determined using Getis-Ord's G*. Results show that boundary detection using a local edge detector is greatly affected by the spatial conditions of the data, namely variance, abruptness of the spatial gradient between two patches and patches' level of spatial autocorrelation. They also suggest that data aggregation is not a panacea for bringing out the ecological process creating the patches and that indicators derived from local measures of spatial association can be complementary tools for analysing spatial structures affecting boundary delineation. © Springer Science+Business Media, LLC 2007. },
    AFFILIATION = { Department of Geography, Simon Fraser University, Burnaby, BC V5A 1S6, Canada; National Public Health Institute of Québec, 190 Crémazie East blvd., Montréal, QC H2P 1E2, Canada; Department of Zoology, University of Toronto, 24 Harbord St., Toronto, ON M5S 3G5, Canada; Department of Geography, University of Toronto at Mississauga, Mississauga, ON L5L 1C6, Canada },
    AUTHOR_KEYWORDS = { Edge detection; Local statistics; Spatial autocorrelation; Stationarity },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1007/s10651-007-0061-9 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-55349141119&doi=10.1007%2fs10651-007-0061-9&partnerID=40&md5=2d9d834c8c8e24bc6770087ac1318d93 },
}

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