Hello OTB team,
I have been using the ImageSampleExtractorFilter, and its superclass
PersistentSamplingFilterBase, and I have a few questions concerning these
classes.
1. What is the point of the "FieldName" attribute ?
otbPersistentSamplingFilterBase.h lines 81-84
/** Set/Get macro for the field name containing class names * in the input
vectors.*/
itkSetMacro(FieldName, std::string);
itkGetMacro(FieldName, std::string);
It is only called once, and basically raises an error if the field isn't
present in the output shapefile..
otbPersistentSamplingFilterBase.hxx lines 118-123
int fieldIndex = featIt->ogr().GetFieldIndex(this->m_FieldName.c_str());
if (fieldIndex < 0) {
itkGenericExceptionMacro("Field named "<<this->m_FieldName<<" not found!");
}
this->m_FieldIndex = fieldIndex;
The m_FieldIndex attribute is not called anywhere else except for in these
lines.. It seems totally useless !
I do not understand why the filter requires the user to give the name of
one of the fields in the output shapefile for the sample extraction step
anyway. The filter and the application should work even if the output
shapefile contains no fields at all. This is also quite inconvenient for
anyone inheriting this class, as they are also required to give a field
name.
2. The PersistentSamplingFilterBase provides a "ProcessSample" method that
should be overriden by a child class, and that should define the function to
apply to each sample in the shapefile.
However, the ImageSampleExtractorFilter does everything in the
ThreadedGenerateData. Why not use the ProcessSample method ?
Thank you,
Dawa
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