SampleExtraction Extracts samples values from an image. Learning QgsProcessingParameterRasterLayer|in|InputImage|None|False QgsProcessingParameterFile|vec|Input sampling positions|QgsProcessingParameterFile.File|None|None|False QgsProcessingParameterFileDestination|out|Output samples|None|None|True OTBParameterChoice|outfield|Output field names|prefix;list|0|True QgsProcessingParameterString|outfield.prefix.name|Output field prefix|None|False|True QgsProcessingParameterString|outfield.list.names|Output field names|None|True|True QgsProcessingParameterString|field|Field Name|None|True QgsProcessingParameterNumber|layer|Layer Index|QgsProcessingParameterNumber.Integer|0|True