所以我一直在使用R中的以下教程,习惯于NetCDF(我使用netcdf4包):http://geog.uoregon.edu/bartlein/courses/geog607/Rmd/netCDF_01.htm
但是,我无法在我的数据集中创建任何特定年份的精美图片,可以在此处找到:https://www.ncdc.noaa.gov/paleo-search/study/19419
这是我的代码,我试图获得公元100年的地图:
library(lattice)
library(ncdf4)
library(chron)
library(RColorBrewer)
setwd('/Users/Nikki/Dropbox/Europe/Drought Maps')
ncname <- "owda"
ncfname <- paste(ncname,".nc",sep="")
dname <- "pdsi"
ncin <- nc_open(ncfname)
print(ncin)
lon <- ncvar_get(ncin, "lon")
nlon <- dim(lon)
head(lon)
lat <- ncvar_get(ncin, "lat", verbose = F)
nlat <- dim(lat)
head(lat)
print(c(nlon, nlat))
t <- ncvar_get(ncin, "time")
nt <- dim(t)
head(t)
drought.array <- ncvar_get(ncin, dname)
dlname <- ncatt_get(ncin, dname, "long_name")
dunits <- ncatt_get(ncin, dname, "units")
fillvalue <- ncatt_get(ncin, dname, "_FillValue")
dim(drought.array)
creation_date <- ncatt_get(ncin, 0, "creation_date")
Description <- ncatt_get(ncin, 0, "Description")
nc_close(ncin)
m <- 100
drought.slice <- drought.array[m,,]
image(lon, lat, drought.slice, col = rev(brewer.pal(10, "RdBu")))
特别是,当我尝试运行最后一行时,我收到以下错误消息:
image.default中的错误(lon,lat,drought.slice,col = rev(brewer.pal(10,: z的尺寸不是长度(x)( - 1)乘以长度(y)( - 1)
有人可以解释一下我做错了什么吗?
顺便说一下,为了让您对我的数据结构有所了解,请点击此处:
>print(ncin)
File owda.nc (NC_FORMAT_NETCDF4_CLASSIC):
1 variables (excluding dimension variables):
double pdsi[time,lat,lon]
longname: Palmer Drought Severity Index
units: unitless
3 dimensions:
time Size:2013
lat Size:88
longname: latitude
units: degrees
lon Size:114
longname: longitude
units: degrees
2 global attributes:
creation_date: 10-Mar-2015 15:53:08
Description: Reconstructed PDSI for Europe-Mediterranean Region (OWDA v1.0)
答案 0 :(得分:1)
看起来您的图片需要旋转:
rotate <- function(x) t(apply(x, 2, rev))
image(lon, lat, rotate(drought.slice), col = rev(brewer.pal(10, "RdBu")))
适合我。