SAGA.grid_filter.3: Multi Direction Lee Filter

{"id": "SAGA.grid_filter.3", "title": "Multi Direction Lee Filter", "description": "The tool searches for the minimum variance within 16 directions and applies a Lee Filter in the direction of minimum variance. The filter is edge-preserving and can be used to remove speckle noise from SAR images or to smooth DTMs. Applied to DTMs, this filter will preserve slope breaks and narrow valleys.<br/>For more details, please refer to the references. 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