I'm trying to write a Python code that will import LANDSAT satellite images into Grass GIS by adapting this code: http://grass.osgeo.org/wiki/LANDSAT
LANDSAT tiles are downloaded as folders, each containing 7 tiff images (Band 1-7). I therefore have a directory which contains several subdirectories (one for each LANDSAT tile).
My code at present is as follows:
#!/usr/bin/python
import os
import sys
import glob
import grass.script as grass
def import_tifs(dirpath):
for dirpath, dirname, filenames in os.walk(dirpath):
for dirname in dirpath:
dirname = os.path.join(dirpath,dirname)
for file in os.listdir(dirname):
if os.path.splitext(file)[-1] != '.TIF':
continue
ffile = os.path.join(dirname, file)
name = os.path.splitext(file)[0].split(dirname)[-1]
grass.message('Importing %s -> %s@%s...' % (file, name, dirpath))
grass.run_command('r.in.gdal',
flags = 'o',
input = ffile,
output = name,
quiet = True,
overwrite = True)
def main():
if len(sys.argv) == 1:
for directory in filter(os.path.isdir, os.listdir(os.getcwd())):
import_tifs(directory)
else:
import_tifs(sys.argv[1])
if __name__ == "__main__":
main()
I'm getting the following error:
Traceback (most recent call last):
File "C:/Users/Simon/Documents/import_landsat2.py", line
40, in <module>
main()
File "C:/Users/Simon/Documents/import_landsat2.py", line
37, in main
import_tifs(sys.argv[1])
File "C:/Users/Simon/Documents/import_landsat2.py", line
17, in import_tifs
for file in os.listdir(dirname):
WindowsError: [Error 3] The system cannot find the path
specified: 'dirpath\\C/*.*'
Can anyone explain what is happening and what I need to do to fix it, or suggest an alternative? Thanks.
I believe your main problem is that dirname in os.walk() returns a list (not a string), so your subsequent strings (namely dirname = os.path.join(dirpath,dirname)) are a bit malformed. Here is one possible alternative - to test this, I used the full path to the directory as sys.argv[1], but you can make it more dynamic to suit your case. Also, avoid using variable names such as file since they are Python keywords. I couldn't test out your grass.* functions, but hopefully this will be a clear enough example so you can tweak how you need. os.walk() natively handles a lot of standard parsing, so you can remove some of the directory-manipulating functions:
def import_tifs(dirpath):
for dirpath, dirname, filenames in os.walk(dirpath):
# Iterate through the files in the current dir returned by walk()
for tif_file in filenames:
# If the suffix is '.TIF', process
if tif_file.upper().endswith('.tif'):
# This will contain the full path to your file
full_path = os.path.join(dirpath, tif_file)
# tif_file will already contain the name, so you can call from here
grass.message('Importing %s -> %s@%s...' % (full_path, tif_file, dirpath))
grass.run_command('r.in.gdal',
flags = 'o',
input = full_path,
output = tif_file,
quiet = True,
overwrite = True)