文章基本信息

标题：R Package gdistance: Distances and Routes on Geographical Grids
本地全文：下载
作者：Jacob van Etten
期刊名称：Journal of Statistical Software
印刷版ISSN：1548-7660
电子版ISSN：1548-7660
出版年度：2017
卷号：76
期号：1
页码：1-21
语种：English
出版社：University of California, Los Angeles
摘要：The R package gdistance provides classes and functions to calculate various distance measures and routes in heterogeneous geographic spaces represented as grids. Least-cost distances as well as more complex distances based on (constrained) random walks can be calculated. Also the corresponding routes or probabilities of passing each cell can be determined. The package implements classes to store the data about the probability or cost of transitioning from one cell to another on a grid in a memory-efficient sparse format. These classes make it possible to manipulate the values of cell-to-cell movement directly, which offers flexibility and the possibility to use asymmetric values. The novel distances implemented in the package are used in geographical genetics (applying circuit theory), but also have applications in other fields of geospatial analysis.
关键词：geospatial analysis;landscape genetics;circuit theory;connectivity;dispersal;travel;least-cost path;least-cost distance;random walk;grid;R