Two-monthly Water Bird Breeding Contributing Habitat Area

This dataset has been generated to identify the contributing habitat (feeding) area to areas of potential water bird nesting sites across the Murray Darling Basin. This information coupled with existing datasets (water bird observations) will be used to build upon current knowledge of water birds and their requirements within the basin. This in turn will help inform environmental watering with a view to sustain and improve water bird breeding throughout the basin.\n\n\n\nLineage: Two-monthly layers for contributing area (hectares) of water bird habitat (~100m resolution; MDB extent; bi-monthly time-step; 1988-2020). The collection contains four different datasets constructed from the combination two parameters, focal radius and water depth range. For each raster cell within the input layer (version 2 of the Two-monthly flood depth, see associated collection below) if the cell has a value (presence of water or within 500 meters of water), calculate the number of cells (and therefore the area) that surround the cell given a focal radius where the water depth is between a given range.\n\nFocal radius;\n- 3 km\n- 20km\n\nWater depth range;\n- 0.5 to 1.0 m\n- 0.5 to 1.5 m\n\nFile names;\n- 3km_0.5_1.0_waterbirdhabitat_mdb.zip\n- 3km_0.5_1.5_waterbirdhabitat_mdb.zip\n- 20km_0.5_1.0_waterbirdhabitat_mdb.zip\n- 20km_0.5_1.5_waterbirdhabitat_mdb.zip\n\nEach zip file contains the two-monthly layers from 1988 to 2020

本数据集旨在识别墨累-达令盆地（Murray Darling Basin）内潜在水鸟（water bird）筑巢区域的贡献型（觅食）栖息地。将本数据集与现有水鸟观测数据集（water bird observations）相结合，可用于完善当前对该流域内水鸟及其生存需求的认知，进而为环境补水（environmental watering）决策提供支撑，以维持并改善流域内水鸟的繁育状况。

数据集谱系：本数据集包含以双月时间步长（bi-monthly time-step）生成的贡献型栖息地面积（单位：公顷）图层，空间分辨率约100米，覆盖墨累-达令盆地全域，时间跨度为1988年至2020年。数据集由聚焦半径（focal radius）与水深范围（water depth range）两个参数组合构建，共包含4个子数据集。

具体计算逻辑如下：针对输入图层（即双月洪水深度数据集第二版，详见下文关联数据集）中的每个栅格单元（raster cell），若该单元存在水体值或处于距离水体500米范围内，则以该单元为中心，基于给定聚焦半径计算周边符合指定水深范围的栅格单元数量，进而换算得到对应面积。

聚焦半径（focal radius）取值：
- 3千米
- 20千米

水深范围（water depth range）取值：
- 0.5至1.0米
- 0.5至1.5米

对应文件名：
- 3km_0.5_1.0_waterbirdhabitat_mdb.zip
- 3km_0.5_1.5_waterbirdhabitat_mdb.zip
- 20km_0.5_1.0_waterbirdhabitat_mdb.zip
- 20km_0.5_1.5_waterbirdhabitat_mdb.zip

每个压缩包均包含1988年至2020年的双月图层。