Open and manipulate several .tiff files from one folder using a loop in Python? Ensuring the files are imported as separate variables

Question

I have twenty .tif files which contain data from a globally mapped model. I am importing the files to python so I can rotate them, and make the .tif files Atlantic centered rather than Pacific centered. I can rotate individual files using the code below, however, I want to import all 20 files, rotate them all, and save them all in a new location using a loop rather than repeating the below lines of code for every single file.

TLDR: I need advice on how to loop the code below so can rotate 20 .tif files which are all in the same folder.

import rioxarray
rds_2000 = rioxarray.open_rasterio("path_to_tif")
rds_2000 = rds_2000.assign_coords(x=(((rds_2000.x + 180) % 360) - 180)).sortby('x')
rds_2000.rio.to_raster("path_to_newly_saved_tif)

celalp · Accepted Answer · 2023-01-10 17:33:14Z

2

Maybe something like this?

Assuming you write a function that captures the code you attached and returns the processed file

def process_function(filepath):
   do_something
   return processed_file

Then you can either created a dict or a list, if you want to access the files by filename or some other method dict is probably better.

files=os.listdir(files) #os some other method may be list comprehension
# alternative
# files=[file for file in os.listdir() if file.endswith(".tiff")
processed={}
for file in files:
   processed[file]=process_function(file)

now you can access the data by going processed[<filename>].

Hope that helps.

answered Jan 10, 2023 at 17:33

celalp

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