Batch rename MODIS data?

Question

I have MOD13Q1 NDVI images. Data are named in this format:

MOD13Q1.A2007049.h26v06.006.2015161224938_MODIS_Grid_16DAY_250m_500m_VI.tif  

(YYYYDDD) Here 2007 is a year and 049 is day in year.

I have to rename it in this format: (YYYY.MM.DD) 2007.02.18

I am renaming it manually for every single file. How to perform a batch process for renaming all the files?

Answer 1

Suppose the following files:

MOD13Q1.A2007049.h26v06.006.2015161224938_MODIS_Grid_16DAY_250m_500m_VI.tif
MOD13Q1.A2007051.h26v06.006.2015161224938_MODIS_Grid_16DAY_250m_500m_VI.tif

and that they are stored in directory C:/modis_files

Run:

setwd('C:\\modis_files') #path to folder where MODIS files are.

file.rename(list.files(), paste(as.Date(substr(list.files(),10,16),"%Y%j"),".tif", sep=""))

It will result in:

2007-02-18.tif
2007-02-20.tif

---

If you want to keep the entire file name, while only replacing the [year + julian days], then Bharadwaj A K's answer is the one.

Answer 2

If you were to use R language (open source), this will work.

setwd("C:/modis") #path of modis files
li<-as.data.frame(list.files(pattern = ".tif|.TIF"))
li$nn<-paste0(substr(li[,1],1,9),format(as.Date(substr(li[,1],10,16), "%Y%j"),"%Y.%m.%d"),substr(li[,1],17,75))
for(i in 1:nrow(li)){
  file.rename(as.character(li[i,1]),li[i,2])
}

Answer 3

For anyone that wants a Python approach, try the following:

import datetime, os, glob

inws = '/path/to/tiff/workspace'

tiffs = glob.glob(os.path.join(inws, "*.tif"))

for tiff in tiffs:
    julien_date = os.path.basename(tiff)[11:16] # Extract the julien date string
    date = datetime.datetime.strptime(julien_date, '%y%j').date() # Format date
    outname = os.path.join(inws, date.strftime('%y-%m-%d') + ".tif") # Create outfile name and path
    os.rename(tiff, outname) # Rename the files