This image is based on NASA open data Modis monthly temperature data 2009-2021

Data is MOLT/MOD11C3.006

https://lpdaac.usgs.gov/products/mod11c3v006/

https://e4ftl01.cr.usgs.gov/MOLT/MOD11C3.006/ archive copy at the Wayback Machine

Wan, Z., S. Hook, G. Hulley. MOD11C3 MODIS/Terra Land Surface Temperature/Emissivity Monthly L3 Global 0.05Deg CMG V006. 2015, distributed by NASA EOSDIS Land Processes DAAC, https://doi.org/10.5067/MODIS/MOD11C3.006. Accessed 2021-10-23.

library(raster) library(rgdal) library(terra) library(RNetCDF)

dirlist1<-list.files("./data")

lenlist1<-length(dirlist1)

for (n in 1:lenlist1)

{

failin01<-dirlist1[n]

failin1<-paste0("./data/",failin01)

failout1<-paste0("./process/","tk7_",as.character(n-1),".nc")

failin1 failout1

s1 <- sds(failin1)

t1=s1[1] t2=s1[6] t3=(t1+t2)/2 t4=t3-273.15

rr <- writeCDF(t4, failout1, overwrite=TRUE, varname="ts", longname="Surface Temperature", unit="degC")

}

current.list <- list.files(path="./process", pattern =".nc", full.names=TRUE)

r.stack<- stack(current.list)

mean1 <- calc(r.stack, fun = mean, na.rm = T)

writeRaster(mean1, "t7_mean_21.nc", overwrite=TRUE, format="CDF", varname="Temperature", varunit="degC",

       longname="Temperature -- average of 21 years", xname="long",   yname="lat")
       

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