在使用rasterToPoints创建矩阵之后，是否可以使新对象恢复为原始的栅格堆栈/栅格砖形式？我的对象称为“ avghist”，具有138个值/层，但是我希望这成为其他用途的栅格堆栈/砖块。这是avghist的创建方式：
data("wrld_simpl")
b<-wrld_simpl
data("wrld_simpl")
b<-wrld_simpl
landhist <- mask(RCP1pctCO2Median,b)
histnew<-rasterToPoints(landhist)
weighthist <- cos(histnew[,"y"]*(pi/180))
histnew[,3:ncol(histnew)] = apply(histnew[,3:ncol(histnew)], 2, function(x) x
* weighthist)
avghist <- colSums(histnew[,3:ncol(histnew)])/sum(weighthist)
avghist
head(avghist)
layer.1 layer.2 layer.3 layer.4 layer.5 layer.6
52.75701 50.86984 49.91926 49.35157 52.78295 48.57297
“ landhist”已经是一个光栅块，但是使用rasterToPoints转换为矩阵，最终获得了“ avghist”。 Landhist看起来像这样：
class : RasterBrick
dimensions : 64, 128, 8192, 138 (nrow, ncol, ncell, nlayers)
resolution : 2.8125, 2.789327 (x, y)
extent : -181.4062, 178.5938, -89.25846, 89.25846 (xmin, xmax, ymin, ymax)
coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
data source : in memory
names : layer.1, layer.2, layer.3, layer.4, layer.5, layer.6, layer.7,
layer.8, layer.9, layer.10, layer.11, layer.12, layer.13, layer.14, layer.15, ...
min values : 52.88060, 54.93341, 55.79788, 54.18263, 53.85123, 55.68460, 50.17187,
49.60006, 55.21446, 62.36937, 56.81446, 64.73854, 54.57714, 55.34295, 59.67952, ...
max values : 99.60231, 96.26976, 115.46164, 123.63807, 108.63827, 107.94791, 102.06677,
102.09359, 132.50890, 138.31932, 101.19222, 97.19884, 115.07969, 131.96504, 120.14971, ...
要将“ avghist”转换为光栅，我尝试了以下操作：
library(raster)
newly<-rasterize(avghist)
但是，这样做，我收到此错误：
"Error in (function (classes, fdef, mtable) : unable to find an inherited method for function ‘rasterize’ for signature ‘"numeric", "missing"’
为什么会出现此错误？据我了解，栅格化功能应将avghist更改为栅格砖或堆栈，不是吗？
这是as.raster（avghist / 255）的结果：
最近<-as.raster（avghist / 255）
> print(newly)
[,1]
[1,] "#353535"
[2,] "#333333"
[3,] "#323232"
[4,] "#313131"
[5,] "#353535"
[6,] "#313131"
[7,] "#313131"
[8,] "#333333"
[9,] "#333333"
[10,] "#303030"
[11,] "#333333"
[12,] "#363636"
[13,] "#353535"
[14,] "#363636"
[15,] "#333333"
[16,] "#353535"
[17,] "#353535"
[18,] "#353535"
[19,] "#383838"
[20,] "#343434"
[21,] "#353535"
[22,] "#353535"
[23,] "#383838"
[24,] "#383838"
[25,] "#333333"
[26,] "#373737"
[27,] "#363636"
[28,] "#353535"
[29,] "#393939"
[30,] "#343434"
[31,] "#333333"
[32,] "#343434"
[33,] "#353535"
[34,] "#373737"
[35,] "#383838"
[36,] "#3D3D3D"
[37,] "#393939"
[38,] "#373737"
[39,] "#3C3C3C"
[40,] "#353535"
[41,] "#383838"
[42,] "#3C3C3C"
[43,] "#363636"
[44,] "#363636"
[45,] "#3B3B3B"
[46,] "#3B3B3B"
[47,] "#383838"
[48,] "#373737"
[49,] "#383838"
[50,] "#343434"
[51,] "#363636"
[52,] "#393939"
[53,] "#393939"
[54,] "#3C3C3C"
[55,] "#3D3D3D"
[56,] "#383838"
[57,] "#393939"
[58,] "#3B3B3B"
[59,] "#383838"
[60,] "#383838"
[61,] "#383838"
[62,] "#3E3E3E"
[63,] "#3B3B3B"
[64,] "#3C3C3C"
[65,] "#3E3E3E"
[66,] "#404040"
[67,] "#3F3F3F"
[68,] "#393939"
[69,] "#383838"
[70,] "#383838"
[71,] "#393939"
[72,] "#3C3C3C"
[73,] "#3F3F3F"
[74,] "#3B3B3B"
[75,] "#3E3E3E"
[76,] "#3A3A3A"
[77,] "#373737"
[78,] "#3A3A3A"
[79,] "#3E3E3E"
[80,] "#3E3E3E"
[81,] "#434343"
[82,] "#393939"
[83,] "#444444"
[84,] "#454545"
[85,] "#3C3C3C"
[86,] "#404040"
[87,] "#3E3E3E"
[88,] "#444444"
[89,] "#414141"
[90,] "#444444"
[91,] "#464646"
[92,] "#3F3F3F"
[93,] "#434343"
[94,] "#424242"
[95,] "#424242"
[96,] "#404040"
[97,] "#3C3C3C"
[98,] "#454545"
[99,] "#444444"
[100,] "#414141"
[101,] "#484848"
[102,] "#454545"
[103,] "#494949"
[104,] "#434343"
[105,] "#444444"
[106,] "#464646"
[107,] "#424242"
[108,] "#464646"
[109,] "#494949"
[110,] "#414141"
[111,] "#414141"
[112,] "#454545"
[113,] "#3E3E3E"
[114,] "#4B4B4B"
[115,] "#4A4A4A"
[116,] "#424242"
[117,] "#414141"
[118,] "#484848"
[119,] "#424242"
[120,] "#474747"
[121,] "#434343"
[122,] "#444444"
[123,] "#454545"
[124,] "#3F3F3F"
[125,] "#424242"
[126,] "#474747"
[127,] "#464646"
[128,] "#414141"
[129,] "#3E3E3E"
[130,] "#474747"
[131,] "#484848"
[132,] "#414141"
[133,] "#454545"
[134,] "#474747"
[135,] "#444444"
[136,] "#4C4C4C"
[137,] "#4F4F4F"
[138,] "#494949"
这现在是栅格化格式吗？
谢谢，我们将不胜感激！
答案 0 :(得分：0)
您是否尝试过进行raster(avghist)或as.raster(avghist)？