Australian Coastal Sediment Compartments

The Australian Coastal Sediment Compartment data package consists of seven separate spatial data sets (2 point and 5 polygon) produced as a result of a 2012 technical workshop in which a panel of coastal science experts compartmentalised the Australian coastal zone. The three broad-scale polygon data layers - Coastal Realms, Regions and Divisions - capture high-level environmental attributes and information, and were developed as an informal hierarchy. These three data sets are supplied as they provide context and a logical sequence for the development of the compartments. With regards to spatial scale, a hierarchical listing for data sets is given below:
- Coastal Realms (1:5 000 000)
- Coastal Regions (1:1 000 000)
- Coastal Divisions (1:250 000)
- Primary Compartments and Points (1:250 000 - 1:100 000)
- Secondary Compartments and Points (1:100 000 - 1:25 000)
The Primary and Secondary Coastal Sediment Compartment (and Point) data sets represent a regional (1:250 000 - 1:100 000) and sub-regional (1:100 000 - 1:25 000) scale compartmentalisation of the Australian coastal zone into spatial units within (and between) which sediment movement processes are considered to be significant at scales relevant to coastal management. The Primary and Secondary Point data sets were generated and attributed using expert panel knowledge of coastal geomorphology and processes, and represent compartment boundaries along the coast at the respective scales. Environmental attributes used to determine the location of compartment (point) boundaries are given in priority order below.
1 - Gross lithological/geological changes (e.g. transition from sedimentary to igneous rocks).
2 - Geomorphic (topographic) features characterising a compartment boundary (often bedrock-controlled) (e.g. peninsulas, headlands, cliffs).
3 - Dominant landform types (e.g. large cuspate foreland, tombolos and extensive sandy beaches versus headland-bound pocket beaches).
4 - Changes in the orientation (aspect) of the shoreline.
Once generated, the compartment boundary point data were used in conjunction with a number of other input data sets to generate the Primary and Secondary Compartments.
Use Limitations:
The Realm, Region and Division data sets are interim products used to establish a context for the development of the Primary and Secondary points and compartments. There is no formal topological relationship between the Realm, Region and Division data sets. An informal hierarchical (not topological) relationship does exist between the Primary compartments and the Divisions, as seen in the Primary compartment attribute field `ID_Primary. The Primary and Secondary compartments do share a formal topological relationship, and also a formal hierarchical relationships, as shown in the Secondary compartment attribute field `ID_Secondary.
Primary compartments are intended to be representative at a spatial scale of 1:250 000 - 1:100 000 while secondary compartments are intended to be representative at scales from 1:100 000 - 1:25 000.
IT IS IMPORTANT TO NOTE THAT THE COMPARTMENT POLYGON DATA IS NOT ATTRIBUTED WITH ENVIRONMENTAL DATA - ONLY THE PRIMARY AND SECONDARY POINT DATA SETS CONTAIN SUCH ATTRIBUTE DATA.

澳大利亚海岸沉积物分区数据包（Australian Coastal Sediment Compartment data package）包含7个独立的空间数据集（2个点数据集与5个多边形数据集），其源自2012年一场技术研讨会。会上，海岸科学专家小组对澳大利亚沿海区域开展了分区划分工作。
三类大尺度多边形数据层——海岸域（Coastal Realms）、海岸区（Coastal Regions）与海岸分区（Coastal Divisions）——承载了高层次的环境属性与信息，以非正式层级结构构建而成。提供上述三类数据集的目的在于为后续分区的构建提供背景信息与逻辑序列。
就空间尺度而言，数据集的层级列表如下：
- 海岸域（比例尺1:5 000 000）
- 海岸区（比例尺1:1 000 000）
- 海岸分区（比例尺1:250 000）
- 一级分区与点集（比例尺1:250 000 - 1:100 000）
- 二级分区与点集（比例尺1:100 000 - 1:25 000）
一级与二级海岸沉积物分区（及点集）数据集，分别代表澳大利亚沿海区域的区域级（1:250 000 - 1:100 000）与亚区域级（1:100 000 - 1:25 000）分区划分，将沿海区划分为若干空间单元，在这些单元内部及单元之间，沉积物运移过程在海岸管理相关尺度下具有显著影响。
一级与二级点集数据集基于专家小组对海岸地貌学与过程的认知生成并赋予属性，代表对应尺度下沿海岸线分布的分区边界。用于确定分区（点）边界位置的环境属性按优先级排序如下：
1. 宏观岩性/地质变化（例如从沉积岩到火成岩的转变）。
2. 表征分区边界的地貌（地形）特征（通常受基岩控制），例如半岛、海岬、悬崖。
3. 优势地貌类型，例如大型尖顶岬角、连岛沙洲与广阔沙质海滩，相较于海岬环绕的袋状海滩。
4. 海岸线走向（方位）的变化。
分区边界点集生成后，与其他若干输入数据集结合，用于生成一级与二级分区。
使用限制：
海岸域、海岸区与海岸分区数据集为临时产物，用于为一级与二级点集及分区的构建提供背景。上述三类数据集之间不存在正式的拓扑关系，但其与一级分区之间存在非正式的层级（非拓扑）关联，这一点可从一级分区属性字段`ID_Primary`中体现。一级与二级分区之间既存在正式的拓扑关系，也存在正式的层级关联，这可从二级分区属性字段`ID_Secondary`中得到验证。
一级分区的适用空间尺度为1:250 000 - 1:100 000，而二级分区的适用尺度范围为1:100 000 - 1:25 000。
重要提示：分区多边形数据集未附带环境属性数据——仅一级与二级点集数据集包含此类属性数据。