library(ncdf4)
library(gstat)
library(sp)
nc = nc_open('g:/chla/modis_chl_a_4km_monthly/2016/A20163362016366.L3m_MO_CHL_chlor_a_4km.nc')
# chla1 = ncatt_get(nc,'chlor_a')
chla  = ncvar_get(nc,'chlor_a',c(7129,1177),c(10,30))
lon   = ncvar_get(nc,'lon',c(7129),c(10))
lat   = ncvar_get(nc,'lat',c(1177),c(30))
nc_close(nc)
class(chla)

cc = data.frame(chla)
cc[is.na(cc)] = 0
data(cc)
class(cc)
names(cc)
coordinates(cc) <- c('x','y')
class(cc)

在这里运行data(cc)以及设置坐标都会出错：

Warning message:
In data(cc) : 没有‘cc’这个数据集
> class(cc)
[1] "data.frame"
> coordinates(cc) <- c('x','y')
Error in `[.data.frame`(object, , value) : undefined columns selected
不知道问什么 求大神解答~
谢谢啦