2010 Index of Stream Condition - Toe of Bank line features

The ISC2010_TOE_OF_BANK line features represent the left and right stream bed lines of the river channel for each River Reach.River condition in Victoria is assessed every 5 years using the Index of Stream Condition (ISC). The Department of Environment and Primary Industries (DEPI) developed a methodology to assess the Physical Form and Riparian Vegetation components of the ISC using remote sensing data, specifically LIDAR and aerial photography. A State Wide mapping project was undertaken in 2010-13 to accurately map the Physical Form and Riparian Vegetation metrics of the ISC . Other ISC metrics were not assessed in the project and were derived from other sources.The Physical Form and Riparian Vegetation Metric products are a combination of mapped Vector and Raster data as well as Tabular Summary Statistics about the mapped features. In the context of the project, the term Metrics is used to refer to both the mapped features and the summary statistics. Remote sensing data used includes 15cm true colour and infra-red aerial photography and four return multi-pulse LiDAR data. This source data was used to derive a variety of Raster data sets including Digital Terrain Models, Slope, Vegetation Height and Vegetation Cover. The Digital Terrain and Slope rasters were used to map Physical Form metrics including Stream Bed, Top of Bank and River Centre Lines while the Vegetation Height and Cover rasters were used to map the Riparian Vegetation metrics.The Project Report "Aerial Remote Sensing for Physical Channel Form and Riparian Vegetation Mapping" describes the remote sensing and mapping approach used to create this data set.

ISC2010_TOE_OF_BANK线要素代表了各河段的河道左右床线。维多利亚州的河流状况每5年通过河流状况指数（Index of Stream Condition, ISC）进行评估。环境与初级产业部（Department of Environment and Primary Industries, DEPI）开发了一套评估方法，借助遥感数据（尤其是激光雷达（LiDAR）与航空摄影）来测算河流状况指数中的物理形态与河岸植被组分。2010至2013年间，项目组启动了一项全州制图项目，以精准绘制河流状况指数的物理形态与河岸植被指标图层。该项目未对河流状况指数的其余指标开展评估，相关数据均取自其他数据源。物理形态与河岸植被指标产品由已制图的矢量数据、栅格数据，以及针对所绘要素的表格汇总统计量整合而成。在本项目语境下，“指标（Metrics）”一词同时指代已绘制图要素与汇总统计量。所用遥感数据包括15厘米分辨率真彩色与红外航空摄影数据，以及四次回波多脉冲激光雷达数据。依托该源数据可衍生出多种栅格数据集，包括数字地形模型（Digital Terrain Models）、坡度、植被高度与植被覆盖度数据。数字地形与坡度栅格数据被用于绘制物理形态指标图层，涵盖河床、岸顶与河道中心线；而植被高度与覆盖度栅格数据则用于绘制河岸植被指标图层。项目报告《用于物理河道形态与河岸植被制图的航空遥感》详细阐述了本数据集的遥感与制图实现路径。