DTM Filter (slope-based)
grid_filter
QgsProcessingParameterRasterLayer|INPUT|Grid to filter|None|False
QgsProcessingParameterNumber|RADIUS|Search Radius|QgsProcessingParameterNumber.Integer|2|False|1.0|None
QgsProcessingParameterNumber|TERRAINSLOPE|Approx. Terrain Slope|QgsProcessingParameterNumber.Double|30.0|False|None|None
QgsProcessingParameterBoolean|STDDEV            |Use Confidence Interval|True
QgsProcessingParameterRasterDestination|GROUND|Bare Earth
QgsProcessingParameterRasterDestination|NONGROUND|Removed Objects
