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File:Alaska surface temperature january 2001-2021 2.png

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Alaska surface temperature january 2001-2021

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Description
English: Alaska surface temperature january 2001-2021
Date
Source Own work
Author Merikanto

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.

Code to preprocess MOD11C3.006 rasters , years 2021

    1. process modis MOD11C3 monthly temperature data
    2. to produce mean temperature of july
    3. 30.10.2021 0000.0000
    1. input: files like
    1. MOD11C3.A2000183.006.2015066033219

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

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

lenlist1<-length(dirlist1)

for (n in 1:lenlist1)

{

failin01<-dirlist1[n]

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

failout1<-paste0("./process2/","tj1_",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="./process2", pattern =".nc", full.names=TRUE)

r.stack<- stack(current.list)

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

writeRaster(mean1, "t1_mean_21.nc", overwrite=TRUE, format="CDF", varname="T surf Jan", varunit="degC", 

       longname="Mean surface temperature of January, years 2001-2021", xname="long",   yname="lat")

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Date/TimeThumbnailDimensionsUserComment
current12:38, 30 October 2021Thumbnail for version as of 12:38, 30 October 20211,616 × 1,072 (1,013 KB)Merikanto (talk | contribs)update
12:31, 30 October 2021Thumbnail for version as of 12:31, 30 October 20211,472 × 976 (766 KB)Merikanto (talk | contribs)Uploaded own work with UploadWizard

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