.. _ComputeOGRLayersFeaturesStatistics: 

ComputeOGRLayersFeaturesStatistics
==================================





Compute statistics of the features in a set of OGR Layers

Description
-----------

Compute statistics (mean and standard deviation) of the features in a set of OGR Layers, and write them in an XML file. The resulting XML file can then be used by the training application.



Parameters
----------

.. contents:: :local:

.. |br| raw:: html

   <br />

.. |em| raw:: html

   &emsp;

**Vector Data** :code:`-inshp vectorfile` *Mandatory* |br|
Name of the input shapefile

**Output XML file** :code:`-outstats filename [dtype]` *Mandatory* |br|
XML file containing mean and variance of each feature.

**Feature** :code:`-feat string1 string2...` |br|
List of features to consider for statistics.



Examples
--------

From the command-line:

.. code-block:: bash

    otbcli_ComputeOGRLayersFeaturesStatistics -inshp vectorData.shp -outstats results.xml -feat perimeter


From Python:

.. code-block:: python

	import otbApplication

	app = otbApplication.Registry.CreateApplication("ComputeOGRLayersFeaturesStatistics")

	app.SetParameterString("inshp", "vectorData.shp")
	app.SetParameterString("outstats", "results.xml")
	app.SetParameterStringList("feat", ['perimeter'])

	app.ExecuteAndWriteOutput()



Limitations
-----------

Experimental. For now only shapefiles are supported.

See also
--------

| :ref:`OGRLayerClassifier`,:ref:`TrainVectorClassifier`