CLM - Bore water level QLD

## **Abstract** \n\nThe dataset was derived by the Bioregional Assessment Programme from multiple source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement. \n\n\n\nThis dataset contains the water level data for the Queensland part of the Clarence-Moreton Basin. The data were organized by geological formations. Water level data for the Queensland part of the Clarence-Moreton bioregion were obtained from the DNRM database. The 'water level' information in the database refers to the distance from the natural ground surface or reference point to the water surface in a groundwater bore. When the water level is above a reference point, it has a positive value, otherwise it is negative. No record is indicated by a zero. The 'Elevation' table records the elevation of natural ground surface around a bore or the reference point based on AHD or state datum (STD). When two elevation records for the same bore appeared, the most recent record was used. Thus, the water level represented as AHD is the sum of the water level in the 'Water level' table and the corresponding elevation in the 'Elevation' table. For the data to be deemed useful in the statistical analyses, they needed to be referenced relative to one datum. In this case, the Australian Height Datum (AHD) was used. Due to inconsistencies in data (being referenced to AHD, STD, and assumed datum (ASS)) and unknown quality and source of the elevations, the Australian one-second DEM was used for referencing all elevation data.\n\n## **Dataset History** \n\nThis dataset was compiled through the following process. \n\n\n\n1. Filter the data using the spatial extent of the Clarence-Moreton Basin;\n\n2. Data quality check;\n\n3. Replace the bore elevation data with the Australia 1s DEM data;\n\n4. Computer groundwater level using the measured water depth and the bore elevation;\n\n5. Aquifer assignment. Seven screen codes are used to indicate different bores in terms of their spatial relationship with a particular aquifer.\n\nI: bores with screen intervals inside the aquifer\n\nT: bores with a screen top inside the aquifer\n\nB: bores with a screen bottom within the aquifer\n\nE: bores with screen intervals penetrating the entire aquifer\n\nBOI: bores with their bottom inside the aquifer although without screen information in the database\n\nDS: aquifer assignment for a bore sourced directly from the state database where the bore is only open to a single aquifer\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2014) CLM - Bore water level QLD. Bioregional Assessment Derived Dataset. Viewed 28 September 2017, http://data.bioregionalassessments.gov.au/dataset/20c5f443-bd19-4d2b-9f96-6633244c64e5.\n\n## **Dataset Ancestors** \n\n* **Derived From** [Bioregional Assessment areas v02](https://data.gov.au/data/dataset/e414b1b3-c42e-42e9-9cc4-2093054aa35f)\n\n* **Derived From** [Natural Resource Management (NRM) Regions 2010](https://data.gov.au/data/dataset/1d54e38f-4051-4f0c-a350-c7dbd8eba65b)\n\n* **Derived From** [Bioregional Assessment areas v03](https://data.gov.au/data/dataset/96dbf469-5463-4f4d-8fad-4214c97e5aac)\n\n* **Derived From** [QLD Department of Natural Resources and Mines Groundwater Database Extract 20142808](https://data.gov.au/data/dataset/a5c5cbdb-1152-43f7-9533-a123027b7ce1)\n\n* **Derived From** [Bioregional Assessment areas v01](https://data.gov.au/data/dataset/0fd0d820-30b3-451f-a126-a50040426999)\n\n* **Derived From** [GEODATA TOPO 250K Series 3, File Geodatabase format (.gdb)](https://data.gov.au/data/dataset/96ebf889-f726-4967-9964-714fb57d679b)\n\n* **Derived From** [GEODATA TOPO 250K Series 3](https://data.gov.au/data/dataset/a0650f18-518a-4b99-a553-44f82f28bb5f)\n\n* **Derived From** [NSW Catchment Management Authority Boundaries 20130917](https://data.gov.au/data/dataset/0dc4272e-c081-4ed4-9645-aa336ffacd85)\n\n* **Derived From** [Geological Provinces - Full Extent](https://data.gov.au/data/dataset/0a064b3b-2a1e-4672-80d9-03333be67aad)\n\n* **Derived From** [Geoscience Australia, 1 second SRTM Digital Elevation Model (DEM)](https://data.gov.au/data/dataset/9a9284b6-eb45-4a13-97d0-91bf25f1187b)\n\n

**摘要**
本数据集由生物区域评估计划（Bioregional Assessment Programme）从多源数据集衍生所得，其原始源数据集已在本元数据声明的"谱系（Lineage）"字段中列明，衍生该数据集的具体处理流程详见本元数据声明的"历史记录（History）"字段。

本数据集涵盖克拉伦斯-莫顿盆地（Clarence-Moreton Basin）昆士兰州段的地下水位数据，数据按地质地层进行分类组织。克拉伦斯-莫顿生物区域昆士兰州段的水位数据源自昆士兰州自然资源与矿业部（Department of Natural Resources and Mines，简称DNRM）数据库。该数据库中的"水位"字段指代自然地表或参考点至地下水钻孔水面的垂直距离：当水位高于参考点时，数值为正；反之则为负；无有效记录时以0表示。"高程（Elevation）"表记录了钻孔周边自然地表或参考点基于澳大利亚高程基准面（Australian Height Datum，简称AHD）或州基准面（State Datum，简称STD）的高程数值。若同一钻孔存在多条高程记录，则选用最新的一条。因此，以澳大利亚高程基准面（AHD）为统一基准的地下水位值，等于"水位"表中的实测水位数值与"高程"表中对应高程值的代数和。为确保数据可用于统计分析，需统一采用单一高程基准面，本数据集最终选定澳大利亚高程基准面（AHD）作为统一基准。由于原始高程数据存在基准不统一的问题（部分数据采用AHD、STD或假定基准面（Assumed Datum，简称ASS）），且部分高程数据的质量与来源不明，因此本数据集采用澳大利亚1秒分辨率数字高程模型（Digital Elevation Model，简称DEM）对所有高程数据进行基准校准与统一。

**数据集历史**
本数据集通过以下流程编译完成：
1. 基于克拉伦斯-莫顿盆地的空间范围对原始数据进行筛选；
2. 开展数据质量检查与清洗；
3. 采用澳大利亚1秒分辨率数字高程模型（DEM）替换原有的钻孔高程数据；
4. 根据实测水深与钻孔高程计算得到标准化地下水位；
5. 含水层赋值。采用7种筛孔编码来表征钻孔与特定含水层的空间对应关系：
- I：筛孔区间完全位于含水层内部的钻孔
- T：筛孔顶部位于含水层内部的钻孔
- B：筛孔底部位于含水层内部的钻孔
- E：筛孔区间贯穿整个含水层的钻孔
- BOI：虽无筛孔信息，但钻孔底部位于含水层内部的钻孔
- DS：直接源自州级数据库的钻孔，该钻孔仅揭露单一含水层，直接采用该数据库给出的含水层赋值

**数据集引用**
生物区域评估计划（2014）CLM - 昆士兰州钻孔水位数据（CLM - Bore water level QLD）。生物区域评估计划衍生数据集。查阅日期：2017年9月28日，访问地址：http://data.bioregionalassessments.gov.au/dataset/20c5f443-bd19-4d2b-9f96-6633244c64e5。

**数据集衍生源**
* **衍生自** [生物区域评估区域v02](https://data.gov.au/data/dataset/e414b1b3-c42e-42e9-9cc4-2093054aa35f)
* **衍生自** [2010年自然资源管理（NRM）区域边界](https://data.gov.au/data/dataset/1d54e38f-4051-4f0c-a350-c7dbd8eba65b)
* **衍生自** [生物区域评估区域v03](https://data.gov.au/data/dataset/96dbf469-5463-4f4d-8fad-4214c97e5aac)
* **衍生自** [昆士兰州自然资源与矿业部20142808版地下水数据库提取数据](https://data.gov.au/data/dataset/a5c5cbdb-1152-43f7-9533-a123027b7ce1)
* **衍生自** [生物区域评估区域v01](https://data.gov.au/data/dataset/0fd0d820-30b3-451f-a126-a50040426999)
* **衍生自** [GEODATA 25万比例尺地形系列3 文件地理数据库格式（.gdb）](https://data.gov.au/data/dataset/96ebf889-f726-4967-9964-714fb57d679b)
* **衍生自** [GEODATA 25万比例尺地形系列3](https://data.gov.au/data/dataset/a0650f18-518a-4b99-a553-44f82f28bb5f)
* **衍生自** [20130917版新南威尔士州流域管理局边界](https://data.gov.au/data/dataset/0dc4272e-c081-4ed4-9645-aa336ffacd85)
* **衍生自** [全域地质省边界](https://data.gov.au/data/dataset/0a064b3b-2a1e-4672-80d9-03333be67aad)
* **衍生自** [澳大利亚地球科学局1秒分辨率SRTM数字高程模型（DEM）](https://data.gov.au/data/dataset/9a9284b6-eb45-4a13-97d0-91bf25f1187b)