Streambanks 3rd Order Strahler and Above - Cessnock LGA

The Department of Planning provides support to Local Government to enable evidence-based planning decisions. Biodiversity and Conservation Division collaborated with Cessnock City Council in 2021-2022 to deliver environmental map layers (Environmental Lands Study) that facilitate council’s review of their Local Environment Plan. This dataset is one of those and maps all streambanks of larger streams in the 196,468-hectare Cessnock Local Government Area using the Strahler system to identify stream type. All tenures were mapped excluding National Parks and Wildlife Service (NPWS) estate because they are formally reserved and protected under Local Environment Plans and were outside of the scope of the Environmental Lands Study. Data is in vector format and was produced to a scale range of 1:500 – 1:3000.\r\nThe process for delineating streambanks for the Cessnock LGA began by mapping stream order, then adding LiDAR and NearMap imagery as a basemap. The technique of hillshading was then used to show the streambank top edge and topographic features of streambanks.\r\nAll streams higher than 2nd order were buffered by 100m to create the area of interest (AoI) for mapping streambanks. High resolution Light (or Laser) Detection and Ranging (LiDAR) was converted to a hillshade to facilitate the delineation of 3rd order and above streambanks. Streambanks were mapped at a scale of 1:3,000 as lines using a pen graphic tablet and the dataset saved to a file geodatabase.

规划署为地方政府提供支持，以助力其开展循证规划决策。2021-2022年，生物多样性与保护局（Biodiversity and Conservation Division）与塞斯诺克市议会（Cessnock City Council）合作制作了环境图层（即环境土地研究，Environmental Lands Study），用于辅助议会审查其《地方环境规划》（Local Environment Plan）。本数据集即为其中之一，它在面积达196468公顷的塞斯诺克地方政府区域（Cessnock Local Government Area, 简称Cessnock LGA）内，采用斯特拉勒分级系统（Strahler system）对大型溪流的河岸进行全域制图，以识别溪流类型。所有土地保有权均已完成制图，但排除了国家公园与野生动物服务局（National Parks and Wildlife Service, NPWS）的辖区——该区域已依据《地方环境规划》正式纳入保护范围，且不属于本次环境土地研究的范畴。本数据采用矢量格式（vector format）制作，比例尺范围为1:500至1:3000。
为塞斯诺克地方政府区域划定河岸的流程如下：首先绘制溪流等级，随后添加激光雷达（Light Detection and Ranging, LiDAR）与NearMap影像作为底图；继而利用山体阴影（hillshading）技术呈现河岸顶缘与河岸的地形特征。
所有二级及以上的溪流均设置100米缓冲区，以生成河岸制图的关注区域（Area of Interest, AoI）。研究将高分辨率激光雷达数据转换为山体阴影图层，辅助划定三级及以上溪流的河岸。本次制图以1:3000的比例尺，使用手绘数位板以线条形式完成河岸绘制，并将数据集存储至文件地理数据库（file geodatabase）中。