我无法使用R中的光栅包光栅化shapefile。我按照上一篇文章中的代码和提示（“2013年6月30日在R中使用光栅包格式化光栅）。但是，我仍然得到了同样的错误“试图获得插槽”coords“来自基本类的对象（”NULL“）没有插槽”。这是一个与上一篇文章不同的问题吗？非常感谢！
shp<-shapefile(NA_CEC_Eco_Level1.shp")
lcRas <- raster(shp);
r <- lcRas
shp
class : SpatialPolygonsDataFrame
features : 2140
extent : -4334052, 3324076, -3313739, 4267265 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=laea +lat_0=45 +lon_0=-100 +x_0=0 +y_0=0 +a=6370997 +b=6370997 +units=m +no_defs
variables : 5
names : NA_L1CODE, NA_L1NAME, NA_L1KEY, Shape_Leng,
Shape_Area
min values : 0, ARCTIC CORDILLERA, 0 WATER, 1.000517e+04, 1.000668e+07
max values : 9, WATER, 9 GREAT PLAINS, 9.997592e+03, 9.967503e+04
> r
# class : RasterLayer
# dimensions : 1, 1, 1 (nrow, ncol, ncell)
# resolution : 7658128, 7581004 (x, y)
# extent : -4334052, 3324076, -3313739, 4267265 (xmin, xmax, ymin, ymax)
# coord. ref. : NA
zoneRas <- rasterize(shp, r, "NA_L1CODE")
# Found 2140 region(s) and 2334 polygon(s)
# Error in cbind(poly, rbind(poly[-1, ], poly[1, ])) :
# trying to get slot "coords" from an object of a basic class ("NULL") with no slots
zoneRas <- rasterize(shp, r, shp$NA_L1CODE)
# Found 2140 region(s) and 2334 polygon(s)
# Error in cbind(poly, rbind(poly[-1, ], poly[1, ])) :
# trying to get slot "coords" from an object of a basic class ("NULL") with no slots
coordinates(r)
# x y
# [1,] -504987.6 476762.6
coordinates(shp)
# [,1] [,2]
# 0 -322524.6431 -2726795.8939
# 1 1195909.0021 142037.0767
# 2 2126454.5663 1985314.0739
# 3 2052912.8197 2013519.6523
# [etc, etc]