Polygons (Areas)

ff_type: ff_polygon

FF polygon features represent closed area features and may be either 2D or 3D. The coordinate on the feature contains the location of the center. The ids of the lines that make up the border of the polygon may be located in the appropriate attributes on these features. Polygon features may have the following special attributes associated with them:

Attribute Name	Description
ff_up_cluster	If this feature is linked to a cluster, this attribute will be present. Range: Yes
ff_up_cluster_link	If this feature is linked to a cluster, this attribute will contain the creation number of the parent cluster feature. Range: Integer
ff_up_parent_link	If this feature is an enclave—a hole with a centroid—within another polygon area, this attribute will be present. Also, if this feature is a member of a group, this attribute will be present. Range: Yes
ff_up_parent	If this feature is an enclave—a hole with a centroid—within another polygon area, this attribute will contain the creation number of the parent polygon feature. Otherwise, if this feature is a member of a group, this attribute will contain the creation number of the parent group feature. Range: Integer
ff_down_point_link	If this feature is linked to a centroid point, this attribute will be present. Range: Yes
ff_down_point	If this feature is linked to a centroid point, this attribute will contain the creation number of the centroid point. Range: Integer
ff_down_poly_link	If this feature is linked to edges of the polygon, this attribute will be present. Range: Yes
ff_down_edge_ptr{}	If this feature is linked to edges of the polygon, this list attribute will contain the creation numbers of the outer edges of the polygon. Range: Integer
ff_down_hole_start_ ptr{}.{}	If this feature is linked to edges of the polygon, this list of list attributes will contain the creation numbers of the edges of all the holes in the polygon. For example, the creation number for the third edge of the second hole would be found in the attribute ff_down_hole_start_ptr{1}.{2}. Range: Integer
ff_down_enclave_link	If this feature is linked to enclaves—polygons with centroids—within the polygon, this attribute will be present. Range: Yes
ff_down_enclave_ptr{}	If this feature is linked to enclaves—polygons with centroids—within the polygon, this list attribute will contain the creation numbers of the enclaves it contains. Range: Any real number
ff_area_point_x ff_area_point_y ff_area_point_z	These attributes do not appear on features read from FF files. If these attributes are on a feature when written to FF, they specify the location to use as the centroid of the polygon instead of automatically generating one. Range: Any real number