Annual inundation extent of Commonwealth environmental water

Annual data mapping of the maximum extent of Commonwealth environmental water delivered each water year (June to July) to floodplain, wetlands and rivers of the Murray-Darling Basin. and wetland inundation). Annual polyline layers representing the watercourses watered by Commonwealth environmental water (CEW)\r\n\r\nThe data are contained within an ESRI Geodatabase and consist of annual maximum extent rasters and feature class datasets (polylines) which are to be used together to represent the maximum annual extent of Commonwealth environmental water. These data support the evaluation of Commonwealth environmental water by the Flow-MER program.\r\n\r\nnote: Although open libraries do exist to read ESRI Geodatabases (e.g. in QGIS, R, Python) we will make these data available in a more open form soon (or on request).. e.g. a zipped collection of GeoTIFF \r\n\r\n###Inundation maps\r\n\r\nThe inundation maps are derived from observation and acquittal reporting aligned to mapping of water from Sentinel-2 sattelite imagery during dates of watering actions. Each inundation layer has been compiled from multiple sources including new mapping from Sentinel-2 imagery, inundation maps for NSW inland floodplain wetlands prepared by NSW DCCEEW , mapping provided by Flow-MER Area-scale project teams and aerial image interpretation. Mapping was conducted at 10m resolution (Sentinel-2) and rescaled to 25m pixels to align with previous Landasat based work providing a continuous annual record from the start of the program in 2014.\r\n\r\nThe layers were compiled for the Long Term Intervention Monitoring (LTIM) project and its successor the Monitoring Evaluation Research project (Flow-MER). Both programs were tasked with monitoring and evaluating the contribution of Commonwealth environmental water to outcomes in the Murray Darling Basin. The dataset has been prepared at the annual scale, where a process of pixel coding has been applied to attribute contribution and or influence, as outlined below:\r\n\r\n* pixel value = 1. Pixel is likely to be other water (derived from the WoFS dataset) (discontinued)\r\n* pixel value = 2. Pixel is likely to have been influenced by Commonwealth environmental water with high certainty (may include water from other environmental sources). \r\n* pixel value = 3. (not used)\r\n* pixel value = 4. Pixel may have been influenced by Commonwealth environmental water but with low certainty (may include water from other environmental sources). The low certainty classification may have been due to: (a) flood/wet conditions where direct attribution had a high degree of uncertainty, (b) lack of images for assessing inundation during environmental watering actions, (c) highly heterogeneous landscape coupled with a lack of field validation and (d) the inundated ares were already wet and the objective of the action was to increase persistence.\r\n* pixel value = 5. Other environmental water (where collated). Note this dataset is likely to be incomplete and should not be viewed as ALL other environmental water. (discontinued)\r\n* pixel value = 6. Coorong lower lakes. Coded differently simply to facilitate analyses.\r\n\r\nPixel Values 1 and 5 not added since 20/21 (deprecated as not reliable and not used)\r\n\r\n\r\n###Watercourses watered maps\r\nThe linework representing these maps are derived from the ANUDEM (version 5.3.0 3 November 2016) derived raster streams, and vectorised to be usable in vector line feature format. They are initially informed and modified by the coincident locations of AusHydro V2 Watercourse feature class. The features have been organized into specific Feature Class subtypes based upon both the inputs from the AusHydro V2 Watercourse feature class and their behaviour within the AHGF stream network relationships.\r\nNetworkFlowSegment:corresponds to an existing blueline stream from AusHydro Watercourses\r\nNetworkArtificialFlowSegment: corresponds to a stream flow "connector" from AusHydro V2 Watercourses. These are additional stream segments that represent logcial stream flow direction when compared to the AHGFMappedStreams.\r\nNetworkWaterAreaSegment: these are logical stream flow connectors through AHGFWaterbodies.\r\nAll of these features participate in the connected stream flow topology.\r\n\r\nThe maps contain only those segments which were considered to have been influenced by Commonwealth environmental water.\r\n\r\nCompiled by the Flow-MER Basin scale project.\r\n\r\n2014-2019 data based on information from the Long Term Intervention Monitoring (LTIM) project.\r\n\r\n##Citation\r\nCEWH (2025) Annual maximum extent of Commonwealth environmental water. Flow-MER Program. Commonwealth Environmental Water Holder, Australian Government Department of Climate Change, Energy, the Environment and Water. Sourced from https://data.gov.au/data/dataset/annual-inundation-extent-of-commonwealth-environmental-water on [date-sourced].\r\n\r\n## Acknowledgement\r\nWe acknowledge the First Nations peoples as the Traditional Owners and Custodians of the lands, waterways and skies of the Murray-Darling Basin. We respect their continuing connection to culture and Country, and we thank them for their knowledge and science and the values reflected in these data.\r\n本数据集为每年水文年度（6月至次年7月）向墨累-达令盆地（Murray-Darling Basin）的泛滥平原、湿地及河道交付的英联邦环境水（Commonwealth Environmental Water, CEW）最大覆盖范围的年度制图数据，涵盖湿地淹没范围。另有年度折线图层，用于表征受英联邦环境水浸润的河道。 数据存储于ESRI地理数据库（ESRI Geodatabase）中，包含年度最大覆盖范围栅格数据与要素类数据集（折线格式），二者需结合使用以呈现英联邦环境水的年度最大覆盖范围。本数据集用于支持Flow-MER项目开展英联邦环境水的评估工作。 注：尽管现有可读取ESRI地理数据库的开源库（如QGIS、R、Python中可用的库），我们即将以更开放的格式发布本数据（或可根据请求提供），例如压缩打包的地理标记图像文件格式（GeoTIFF）数据集。 ### 淹没范围地图 本淹没范围地图基于补水行动期间的观测与核销报告，并结合Sentinel-2卫星影像（Sentinel-2 satellite imagery）水体制图生成。每个淹没图层整合自多源数据，包括：基于Sentinel-2影像的新制图成果、新南威尔士州气候、能源、环境与水利部（NSW DCCEEW）编制的新南威尔士州内陆泛滥平原湿地淹没地图、Flow-MER区域尺度项目团队提供的制图数据，以及航空影像解译结果。制图分辨率为10米（匹配Sentinel-2影像参数），后重采样至25米像素尺寸，以与此前基于陆地卫星（Landsat）的研究成果对齐，从而实现自2014年项目启动以来的连续年度记录。 本图层由长期干预监测（Long Term Intervention Monitoring, LTIM）项目及其后续项目——监测评估研究项目（Flow-MER）编制。两个项目均负责监测与评估英联邦环境水对墨累-达令盆地治理成效的贡献。本数据集按年度尺度编制，采用像素编码方法对水体的贡献或影响进行属性赋值，具体规则如下： * 像素值=1：该像素大概率为其他水体（源自WoFS数据集），现已停用。 * 像素值=2：该像素大概率受到英联邦环境水影响，置信度较高（可能包含其他环境水源体）。 * 像素值=3：未使用。 * 像素值=4：该像素可能受到英联邦环境水影响，但置信度较低（可能包含其他环境水源体）。置信度较低的原因包括：(a) 区域处于洪水或湿润状态，直接归因存在较高不确定性；(b) 环境补水行动期间缺乏用于评估淹没范围的影像；(c) 景观高度异质且缺乏野外验证；(d) 淹没区域原本已处于湿润状态，本次补水的目标是延长水体留存时长。 * 像素值=5：其他环境水体（已整合）。注：本数据集大概率不完整，不应被视为所有其他环境水体的完整集合，现已停用。 * 像素值=6：库龙下湖区（Coorong lower lakes）。为便于分析采用了单独的编码规则。 自2020/21水文年度起，不再使用像素值1和5（因可靠性不足已弃用，不再纳入数据）。 ### 受浸润河道制图数据 本制图的线要素数据源自基于ANUDEM（5.3.0版本，2016年11月3日）生成的栅格河道，经矢量化处理为矢量线要素格式。初始数据基于AusHydro V2水道（AusHydro V2 Watercourse）要素类的重合位置进行构建与修正。根据AusHydro V2水道要素类的输入数据以及其在AHGF水系网络（AHGF stream network）关系中的行为特征，要素被划分为特定的要素类子类型： * 网络水流分段（NetworkFlowSegment）：对应AusHydro水道数据中已有的蓝线河道。 * 人工水流分段（NetworkArtificialFlowSegment）：对应AusHydro V2水道数据中的河道“连接器”。相较于AHGF制图河道，此类分段为新增河道段，用于表征逻辑水流方向。 * 水域分段（NetworkWaterAreaSegment）：用于表征穿过AHGF水体的逻辑水流连接器。 所有此类要素均纳入连通的河流水流拓扑结构中。本制图仅包含被认定为受英联邦环境水影响的河道分段。 由Flow-MER流域尺度项目编制。 2014-2019年的数据基于长期干预监测（LTIM）项目的相关信息生成。 ## 引用格式 英联邦环境水持有者（Commonwealth Environmental Water Holder, CEWH）(2025)：英联邦环境水年度最大覆盖范围。Flow-MER项目。澳大利亚联邦气候、能源、环境与水利部英联邦环境水持有者。数据来源：https://data.gov.au/data/dataset/annual-inundation-extent-of-commonwealth-environmental-water，[数据获取日期]。 ## 致谢 我们承认原住民族群为墨累-达令盆地的土地、河道与天空的传统所有者与守护者。我们尊重他们与文化和故土的持续联结，并感谢他们为本次数据集所贡献的知识、智慧与价值理念。