Victorian Wetland Environments and Extent - up to 2013

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\n\n\nPolygons showing the extent and types of wetlands in Victoria. This layer is an update of the Wetland 1994 layer, it incorporates new regional mapping, some supplementary mapping and repositioning of planimetrically inaccurate wetlands. Supplementary mapping involved identifying and delineating wetlands which had not previously been mapped, but did not modify the extent of existing wetlands. It was undertaken primarily using aerial photograph interpretation (photos from 2007 to 2011) supplemented with existing geospatial datasets that provided context and informed the identification of wetland boundaries (e.g. vegetation mapping, topography). Wetlands were classified (according to the new classification framework) into primary categories based on wetland system type, salinity regime, water regime, water source, dominant vegetation and wetland origin.\n\n## **Purpose** \n\nWETLAND_CURRENT is one of three layers designed to document changes over time in the nature and extent of wetland environments in Victoria. This layer is directly related to WETLAND_PRE_EUROPEAN and WETLAND_1994 via the use of a common wetland identification system.\n\n## **Dataset History** \n\nData Set Source:\n\nNew regional mapping undertaken since 1994 was validated and incorporated. Supplementary mapping was undertaken using aerial photo interpretation and used existing geospatial datasets to provide context and assist in the identification of boundaries. The process did not involve modifying the extent of exisitng wetlands (as delineated in the Wetland_1994 layer) but did reposition planimetrically inaccurate wetlands.\n\nCollection Method:\n\nAerial photograhy interpretation.\n\nProcessing Steps:\n\nStep 1: validate and synthesise the regional wetland inventory updates undertaken since 1994. \n\nStep 2: reposition planimetrically inaccurate wetlands\n\nStep 3: supplementary mapping \n\n\n\nPositional Accuracy: Precision: boundary accuracy for new mapping and repositioning 25m or better \n\n\n\nAttribute Accuracy: The classification scheme is applied using many different sources of data. Wherever possible the confidence in classification is provided. \n\n\n\nCompleteness: All wetlands with an area of 1 hectare or more should be present.\n\n## **Dataset Citation** \n\nVictorian Department of Environment and Primary Industries (2014) Victorian Wetland Environments and Extent - up to 2013. Bioregional Assessment Source Dataset. Viewed 29 September 2017, http://data.bioregionalassessments.gov.au/dataset/aa134d02-cab0-42a6-82bc-bc404514357c.## 摘要 本数据集及其元数据声明由第三方提交至生物区域评估计划（Bioregional Assessment Programme），本文档将按原始提交内容完整呈现。 本数据集以多边形要素展示维多利亚州（Victoria）湿地的分布范围与类型。本图层是对1994年湿地图层（Wetland 1994）的更新，整合了新的区域测绘成果、补充测绘内容，以及对平面坐标不准确的湿地进行的位置校正。补充测绘工作主要针对此前未被绘制的湿地进行识别与描边，未改动现有湿地的范围。该工作主要通过2007至2011年的航空像片解译完成，并辅以现有地理空间数据集以辅助确定湿地边界（如植被测绘、地形数据）。依据全新分类框架，湿地将按照湿地系统类型、盐度状况、水文状况、水源、优势植被及湿地成因划分为一级类别。 ## 数据用途 当前湿地图层（WETLAND_CURRENT）是三款用于记录维多利亚州湿地环境性质与范围随时间变化的图层之一。本图层通过统一的湿地识别体系，与欧洲殖民前湿地图层（WETLAND_PRE_EUROPEAN）及1994年湿地图层（WETLAND_1994）直接关联。 ## 数据集历史 ### 数据集来源 1994年以来开展的新区域测绘成果已通过验证并整合入本数据集。补充测绘工作通过航空像片解译完成，并借助现有地理空间数据集辅助确定边界。本次处理未改动1994年湿地图层（Wetland_1994）中已描绘的现有湿地范围，但对平面坐标不准确的湿地进行了位置校正。 ### 采集方法 航空像片解译。 ### 处理流程 步骤1：验证并整合1994年以来的区域湿地名录更新成果； 步骤2：校正平面坐标不准确的湿地位置； 步骤3：开展补充测绘。 ### 位置精度 精度要求：新测绘及位置校正后的湿地边界精度不低于25米。 ### 属性精度 分类方案基于多源数据制定，尽可能提供分类置信度说明。 ### 完整性要求 所有面积≥1公顷的湿地均应被纳入本数据集。 ## 数据集引用 维多利亚州环境与初级产业部（Victorian Department of Environment and Primary Industries）(2014) 《维多利亚州湿地环境及范围（截至2013年）》，生物区域评估源数据集。2017年9月29日查阅，来源网址：http://data.bioregionalassessments.gov.au/dataset/aa134d02-cab0-42a6-82bc-bc404514357c。