double get_cloud_layer_span_m (int index) const;
void set_cloud_layer_span_m (int index, double span_m);
double get_cloud_layer_elevation_ft (int index) const;
double get_cloud_layer_span_m (int index) const;
void set_cloud_layer_span_m (int index, double span_m);
double get_cloud_layer_elevation_ft (int index) const;