longleaf(spatstat)
longleaf()所属R语言包:spatstat
Longleaf Pines Point Pattern
长叶松树点模式
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Locations and sizes of Longleaf pine trees. A marked point pattern.
长叶松树的位置和大小。一个显着的点模式。
The data record the locations and diameters of 584 Longleaf pine (Pinus palustris) trees in a 200 x 200 metre region in southern Georgia (USA). They were collected and analysed by Platt, Evans and Rathbun (1988).
数据记录的位置和直径584长叶松(松沼泽)树在一个200米×200米的区域在南部的佐治亚州(美国)。他们收集和分析由普拉特,埃文斯和拉思(1988)的。
This is a marked point pattern; the mark associated with a tree is its diameter at breast height (dbh), a convenient measure of its size. Several analyses have considered only the “adult” trees which are conventionally defined as those trees with dbh greater than or equal to 30 cm.
这是一个显着的点模式;标记与树胸高(dbh),方便的措施,其规模是其直径。分析只考虑“成人”的树木,通常定义为这些树木dbh,“大于或等于~30厘米。
The pattern is regarded as spatially inhomogeneous.
图案被视为空间不均匀。
用法----------Usage----------
data(longleaf)
格式----------Format----------
An object of class "ppp" representing the point pattern of tree locations. Entries include
类的一个对象"ppp"点模式树的位置。参赛作品包括:
Cartesian x-coordinate of tree
笛卡尔x坐标树
Cartesian y-coordinate of tree
笛卡尔y坐标树
See ppp.object for details of the format of a point pattern object.
见ppp.object点模式对象的格式的详细信息。
源----------Source----------
Platt, Evans and Rathbun (1988)
普拉特,埃文斯和拉思(1988)
参考文献----------References----------
The population dynamics of a long-lived Conifer (Pinus palustris). The American Naturalist 131, 491–525.
A space-time survival point process for a longleaf pine forest in southern Georgia. Journal of the American Statistical Association 89, 1164–1173.
实例----------Examples----------
data(longleaf)
plot(longleaf)
plot(cut(longleaf, breaks=c(0,30,Inf), labels=c("Sapling","Adult")))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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