Saltmarsh Mapping of Sydney Harbour and Parramatta River 2006. VIS_ID 4157

An assessment of the Coastal Saltmarsh Ecological Endangered Community (EEC) in Sydney Harbour and the Parramatta River by NSW Department of Primary Industries, Cronulla. The first map showing the distribution of saltmarsh for the Parramatta River-Sydney Harbour estuary was created from aerial photos taken in the late 1970s (West et al. 1985). A subsequent map prepared from photos taken in 2000 (West et al. 2004) suggested there had been little change in distribution. However, recent anecdotal reports indicate that there may be many more small patches of saltmarsh than can be defined with aerial photography. Aerial photography and pedestrian survey were used to locate saltmarsh on the foreshore of the Parramatta River-Sydney Harbour, including the estuarine portions of Middle Harbour, Lane Cove River and Duck River. The location, condition and species composition of each patch was determined. Saltmarsh was defined as any intertidal community containing one or more species defined as "Characteristic Species" by the NSW Scientific Committee (2004) in its listing of Coastal Saltmarsh as an Endangered Ecological Community. The most recent aerial photographic coverage of the catchment of the Parramatta River was obtained. The boundaries of saltmarsh were mapped via onscreen digitising using Arcview version 3.3. To ensure consistent spatial accuracy, all digitising was carried out at an onscreen scale of 1: 700 or better. Presumptive maps of saltmarsh were printed at various scales to facilitate on-ground observations. Comprehensive pedestrian and boat based field surveys were carried out of the estuary's entire shoreline, with all saltmarsh patches identified field recorded, regardless of size. The results of field surveys were used to correct and re digitise the preliminary map as appropriate. \r\n\r\nThis 2006 version was supplied as a final step to Stage 2 in 2008. It has less polygons (757) than the former version (772).\r\n\r\nVIS_ID 4157

澳大利亚新南威尔士州初级产业部（NSW Department of Primary Industries）克罗纳拉办事处针对悉尼港与帕拉马塔河沿岸海岸盐沼濒危生态群落（Coastal Saltmarsh Ecological Endangered Community, EEC）开展的评估项目。
首份展示帕拉马塔河-悉尼港河口盐沼分布的地图，基于20世纪70年代末的航拍照片绘制而成（韦斯特等，1985年）。后续基于2000年航拍照片绘制的地图（韦斯特等，2004年）显示，盐沼的分布几乎未发生变化。但近期的传闻报告显示，实际存在的小型盐沼斑块数量，或远超航拍图像所能识别的范围。
本次研究采用航拍与徒步调查相结合的方式，对帕拉马塔河-悉尼港沿岸（包括中港、莱恩考夫河与达克河的河口段）的盐沼进行定位，并逐一记录各盐沼斑块的位置、健康状况与物种组成。本研究中，盐沼的定义为：包含新南威尔士州科学委员会（NSW Scientific Committee，2004年）在《海岸盐沼濒危生态群落名录》中划定的一种或多种“特征物种”的潮间带群落。
研究人员获取了帕拉马塔河流域最新的航拍影像数据，借助ArcView 3.3版本软件，通过屏幕数字化的方式绘制盐沼的边界。为确保空间精度的一致性，所有数字化操作均在1:700或更高的屏幕比例尺下完成。研究人员将推测性盐沼地图按不同比例尺打印，以辅助野外实地观测。
研究团队对该河口的全岸线开展了徒步与乘船结合的全面野外调查，对所有发现的盐沼斑块（无论面积大小）均进行了实地记录与标识。随后根据野外调查结果，对初步绘制的地图进行修正与重新数字化处理。
本数据集的2006版于2008年作为第二阶段的最终成果提交，其多边形要素数量（757个）少于此前版本（772个）。
数据集唯一标识（VIS_ID）：4157