Vicmap Topographic Themes - Features of Interest (FOI) Index Extent Polygon

VTT_FOI_INDEX_EXTENT is part of the Vicmap Topographic Themes (VTT) prooduct. This dataset is a superset of FOI_INDEX_EXTENT and includes the current and retired states of each feature instance. It supports feature versioning (RETIRE_DATE_UFI) and enables feature edit chaining (UFI_OLD).Part of the VTT Features of Interest datasetPolygon extent of ALL features of interest records within Victoria. It holds ALL features ONCE regardless of whether they were derived from a point, line or polygon feature.VTT_FOI_INDEX_EXTENT 属于 Vicmap 地形专题（Vicmap Topographic Themes, VTT）产品的一部分。该数据集是 FOI_INDEX_EXTENT 的超集，包含每个要素实例的当前状态与已退役状态。其支持要素版本控制（RETIRE_DATE_UFI），并可实现要素编辑链（UFI_OLD）功能。本数据集属于VTT兴趣要素数据集的一部分，涵盖维多利亚州内所有兴趣要素记录的多边形范围。无论要素源自点、线还是多边形要素，该数据集均仅存储一次所有要素。