Roughness Instructions

These options control behaviour of the roughness length estimation stage and are all grouped under the roughness key-value.

The roughness sub-section can be used to specify advanced settings for the roughness length estimation stage.

• parameters [Optional, dict] - The parameters applied to the roughness length equation of max(parameter['mean'] * mean, parameter['std'] * std).

• default_values [Optional, dict] - Default values are: {"land": 0.014, "ocean": 0.004, "waterways": 0.004, "rivers": 0.004, "minimum": 0.00001, "maximum": 0.5, "paved": 0.001, "unpaved": 0.011}. If waterways, minimum or maximum are set to null/NaN then the relevant roughness values are left unchanged.

• roads [Required, dict] - Default values are: {"source": "osm", "ignore": ["pedestrian", "footway", "footpath", "track", "path", "cycleway"], "widths": {"default": 8, "residential": 8, "tertiary": 12, "secondary": 12, "motorway": 12}}. Currently "osm" is the only supported source. The specification of an empty roads dictionary {} will lead no roads to be added.