我想在自动映射包中使用autoKrige()函数进行通用克里金简单应用。我有一个不规则间距的测量网格,我想在精细的空间尺度上插入它们之间。示例代码:R通用克里金与autoKrige()
library('automap')
# create an irregularly spaced grid
y <-x <-c(-5,-4,-2,-1,-0.5,0,0.5,1,2,4,5)
grid <-expand.grid(x,y)
names(grid) <-c('x', 'y')
# create some measurements, greatest in the centre, with some noise
vals <-apply(grid,1, function(x) {12/(0.1+sqrt(x[1]^2 + x[2]^2))+rnorm(1,2,1.5)})
# get data into sp format
s <-SpatialPointsDataFrame(grid, data.frame(vals))
# make some prediction locations and get them into sp format
pred <-expand.grid(seq(-5,5,by=0.5), seq(-5,5,by=0.5))
pred <-cbind(pred[,1], pred[,2]) # this seems to be needed, not sure why
pred <-SpatialPoints(pred)
# try universal kriging
surf <-autoKrige(vals~x+y, s, new_data=pred)
这导致错误:
Error in gstat.formula.predict(d$formula, newdata, na.action = na.action, :
NROW(locs) != NROW(X): this should not occur
我试图使NEW_DATA具有相同的行数与原始数据,并且甚至试图使在NEW_DATA的坐标与原始数据完全相同,但仍然出现此错误。如果我犯了一个基本错误,我对地质统计学技术很陌生,所以很抱歉。任何人都可以告诉我哪里出错了?谢谢。
的'预解码<-cbind(PRED [,1],预解码[,2])'一步可以省略对我来说,'autoKrige'工作,即使没有它。 –