[GIS] Using Orfeo ToolBox in Python 2.7

orfeo-toolboxpython-2.7

I want to use Orfeo ToolBox in Python. By using the OSGeo4W package, I installed an otb-python and otb-bin. After installing them, I tried the coding as below:

>>> from sys import argv
>>> import otbApplication

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    import otbApplication
ImportError: No module named otbApplication

I wonder what I missed. My OS is the Windows 7 and Python version is 2.7.

Best Answer

otb python packages are not installed in usual site-packages directory. they are in osgeo4w/lib/otb/python

so you must update PYTHONPATH to import python bindings

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[GIS] Importing Orfeo ToolBox into Python

Before actually using OTB from a Python instance on your computer you have to make sure you have access to the relevant libraries. ArcGIS installs Python in a separate folder from that of OSGeo4W. So, if you are planning on using both ArcPy and OTB you must look closely at the paths and locations of your libraries.

For using OTB from within Python when library paths are in order, please refer to this example from the OTB cookbook. You can also launch OTBApplication commandlines directly, using subprocess.call in Python.

#  Example on the use of the Smoothing application 
# 

# We will use sys.argv to retrieve arguments from the command line. 
# Here, the script will accept an image file as first argument, 
# and the basename of the output files, without extension. 
from sys import argv 

# The python module providing access to OTB applications is otbApplication 
import otbApplication 

# otbApplication.Registry can tell you what application are available 
print "Available applications : " 
print str( otbApplication.Registry.GetAvailableApplications() ) 

# Let's create the application with codename "Smoothing" 
app = otbApplication.Registry.CreateApplication("Smoothing") 

# We print the keys of all its parameter 
print app.GetParametersKeys() 

# First, we set the input image filename 
app.SetParameterString("in", argv[1]) 

# The smoothing algorithm can be set with the "type" parameter key 
# and can take 3 values : 'mean', 'gaussian', 'anidif' 
for type in ['mean', 'gaussian', 'anidif']: 

  print 'Running with ' + type + ' smoothing type' 

  # Here we configure the smoothing algorithm 
  app.SetParameterString("type", type) 

  # Set the output filename, using the algorithm to differenciate the outputs 
  app.SetParameterString("out", argv[2] + type + ".tif") 

  # This will execute the application and save the output file 
  app.ExecuteAndWriteOutput()

[GIS] Importing otbApplication in Python

As commented by @gene you appear to be getting this error:

Because otbApplicationis not in the PYTHONPATH of QGIS (you can use import processing.algs.otb)

Best Answer

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[GIS] Importing Orfeo ToolBox into Python

[GIS] Importing otbApplication in Python

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