2010 Index of Stream Condition - Bare Ground polygon features

The ISC2010_BARE_GROUND polygon features represent the parts of the assessed bank face that do not have vegetation cover. The bank face is defined as the area between the Top and Toe of the bank. Areas of Bare Ground less than 5m2 have been removed so that data volume is manageable.\n\nRiver 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. \n\nA 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.\n\nThe 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. \n\nRemote 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.\nThe 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_BARE_GROUND 多边形要素代表被评估岸坡坡面中无植被覆盖的区域。岸坡定义为堤顶（Top of Bank）与堤脚（Toe of Bank）之间的范围。为控制数据体量，面积小于5平方米的裸地区域已被剔除。

维多利亚州的河道状况每5年采用河道状况指数（Index of Stream Condition, ISC）开展一次评估。环境与初级产业部（Department of Environment and Primary Industries, DEPI）研发了一套评估方法，依托遥感数据——具体包括激光雷达（LIDAR）与航空摄影——来测算ISC的物理形态与河岸植被（Riparian Vegetation）两大组分。

2010—2013年间实施了一项全州制图项目，旨在精准制图ISC的物理形态与河岸植被指标。本项目未对其他ISC指标进行评估，相关数据取自其他来源。

物理形态与河岸植被指标产品整合了矢量化（Vector）与栅格（Raster）制图数据，以及针对制图要素的表格汇总统计结果。在本项目语境下，“指标（Metrics）”一词同时指代制图要素与汇总统计数据。

所用遥感数据包含15厘米分辨率真彩色与红外航空摄影，以及四次回波多脉冲激光雷达（LiDAR）数据。基于该源数据，可生成多类栅格数据集，包括数字地形模型（Digital Terrain Models）、坡度、植被高度与植被覆盖度。其中，数字地形与坡度栅格被用于制图物理形态指标，涵盖河床、堤顶与河道中心线；植被高度与覆盖度栅格则被用于制图河岸植被指标。

项目报告《用于河道物理形态与河岸植被制图的航空遥感（Aerial Remote Sensing for Physical Channel Form and Riparian Vegetation Mapping）》详细说明了用于构建本数据集的遥感与制图方法。