Function source

This is read live from inventory/derived.py via inspect.getsource(); what you see is exactly what runs.

def compute_volume_preferred(row):
    """The single best volume to report for this landslide.

    If `volume_site_specific` is set (a manually-entered, independently
    calculated value from a field study or paper), use it. Otherwise fall
    back to the rule-driven `volume_estimated`.

    This is what api_features serves to the map and what downstream consumers
    should treat as the canonical volume.
    """
    vss = row.get('volume_site_specific')
    if vss is not None:
        return vss
    return row.get('volume_estimated')

Proposed changes

All rows already match this rule — nothing to apply.