Australian Mineral Blocks 2020 - Geodatabase

Australian Mineral Blocks (2020) - Aligned with the current Australian Maritime Boundary Dataset (AMB2020). ESRI Geodatabase. Available for download as GDA94 or GDA2020. The dataset was created by Geoscience Australia using the framework described in Section 17 of the Offshore Minerals Act 1994. The international, scheduled areas and coastal waters used in this dataset are those found in the current Australian Maritime Boundary Dataset 2020 (AMB2020). The 2020 release has been updated to reflect the 2018 Timor Sea Treaty. The dataset is comprised of both polygons and points created to very high precision, accurate to within millimetres. The blocks have been cut by Australia's international boundaries, the scheduled areas and the coastal waters. Each block is assigned a polygon, including partial blocks. All blocks are titled with their block ID, and a list of vertices that make up the blocks. Each vertex of the dataset is also replicated as a discrete point in the points dataset. The design of the dataset allows for the exact location of every vertex to be known to millimetre precision. The corner coordinates of blocks are now defined to a high precision, and can be found by querying the appropriate point. The blocks are attributed with fields containing information on: Block ID Parent 1 Million Mapsheet Offshore Area Epoch of the boundaries used to cut the data AMB2014 Datum Origin of the mapsheet in AGD66 The position of all vertices in the block The number of vertices in the block The area of the block in acres The area of the block in hectares The calculation used to find the area of the blocks is estimated to be precise to better than 1%. This is considered to be sufficient as under the permit and licensing arrangements in the Offshore Minerals Act, the area of a block has no relevance. Therefore the area figure is provided solely for reference.澳大利亚2020年版矿产地块数据集——与现行澳大利亚海事边界数据集（AMB2020）对齐。 本数据集采用ESRI地理数据库（Geodatabase）格式，可按GDA94或GDA2020坐标系下载。 本数据集由澳大利亚地球科学局（Geoscience Australia）依据1994年《离岸矿产法》第17条所述框架创建。 本数据集所采用的国际海域、规划海域及近岸水域数据均来自现行2020年版澳大利亚海事边界数据集（AMB2020），该2020版数据集已针对2018年《帝汶海条约》完成更新。 本数据集包含高精度构建的多边形与点要素，位置精度可达毫米级。 矿产地块已通过澳大利亚国际海域边界、规划海域及近岸水域进行裁切，所有地块（含部分地块）均对应一个多边形要素。每个地块均配有地块编号（Block ID）以及构成该地块的顶点列表。本数据集的每个顶点同时作为离散点要素存储于点要素数据集内。 本数据集的设计可确保每个顶点的位置精度可达毫米级，地块角点坐标均以高精度定义，可通过查询对应点要素获取。 地块属性表包含以下字段信息： 地块编号（Block ID） 百万分之一比例尺父图幅（Parent 1 Million Mapsheet） 离岸海域类型（Offshore Area） 裁切数据所用边界的数据集版本（AMB2014） 大地基准面（Datum） AGD66坐标系下的图幅原点（Origin of the mapsheet in AGD66） 地块内所有顶点的位置 地块顶点数量 地块面积（英亩） 地块面积（公顷） 地块面积的计算精度预估优于1%。鉴于《离岸矿产法》规定的许可与授权安排中，地块面积并无实际关联意义，该精度已足够。因此，面积数值仅作参考用途。