[GIS] Importing otbApplication in Python

installationorfeo-toolboxpython

I installed both otb-bin and otb-python using OSGeo4W.

In OSGeo4W Shell, I have no problem importing otbApplication.

But I have a problem doing this in Python Shell. The error message is as below:

>>> import otbApplication
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    import otbApplication
ImportError: No module named otbApplication

I guess I have to configure some environmental variables, but I have no idea.

My OS is Windows 7 and the Python version is 2.7.

Best Answer

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)

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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()

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I had this problem today as I was trying to install GDAL on a new machine. I got the error above after the install appeared to work and I was trying to start using it.

The best solution turned out to be starting again and installing from Christoph Gohlke's unofficial binaries: http://www.lfd.uci.edu/~gohlke/pythonlibs/#gdal

Best Answer

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