The ISC2010_RIVER_CENTRELINE_R line features represent the set of river reaches that are assessed in the 2010 ISC. The line features represents the middle of the river channel and have been defined as the midpoint of the ISC2010_STREAMBED_WIDTH polygon feature. This data set represents a re-alignment of the ISC2004 River Reaches. River centre lines have been connected at Reach ends and flow direction has been enforced. Each Reach has Metric Statistics assessed and recorded in Reach Summary (_R) Tabes.
The ISC2010_RIVER_CENTRELINE_R is designed to JOIN to all ISC2010__R tables.
The ISC2010_RIVER_CENTRELINE_REACH acts as the spatial key to which all other Physical Form and Riparian Vegetation reach metric statistics can be linked.
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.