#读入研究区域（window）
T <- readShapePoly("D:/R/jjj09/xian.shp")
SP <- as(T,"SpatialPolygons")
W <- as(SP,"owin")
#构造ppp格式数据
A <- ppp(X,Y,marks=df,window=W)
结果出现了Warning message:
In ppp(X, Y, marks = df, window = W) :
  901 points were rejected as lying outside the specified window
请问大神们，这个是怎么回事？