The ISC2010_FRAGMENTATION polygon features represent gap areas in vegetation cover in the 40m Riparian Zone (defined as 40m from ISC2010_STREAMBED_WIDTH) . The gap crietria is defined as any area where vegetation cover is less than 20% for at least 10m x 10m. This data set is derived from source Fractional Cover raster data and has been clipped to a 40m buffer of Stream Bed. Small polygons (<10m2) resulting from the clip process have been excluded from the Fragmentation feature class.

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.

The ISC2010_FRAGMENTATION polygon features represent gap areas in vegetation cover in the 40m Riparian Zone (defined as 40m from ISC2010_STREAMBED_WIDTH) . The gap crietria is defined as any area where vegetation cover is less than 20% for at least 10m x 10m. This data set is derived from source Fractional Cover raster data and has been clipped to a 40m buffer of Stream Bed. Small polygons (<10m2) resulting from the clip process have been excluded from the Fragmentation feature class.

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.

The ISC2010_FRAGMENTATION features are used in the assessment of the Fragmentation sub-index where the proportion of the 40m riparian zone that is Fragmented contributes to the Fragmentation Score.

+/- 1m

The UniqueID that describes the Basin and Reach that each Fragmentation polygon falls in is recorded.

Fragmentation has been mapped the same way across the entire ISC2010 network. Fragmentation polygons were extracted from source rasters on a Reach by Reach basis using a 40m buffer and then combined. At Reach ends, the extraction by 40m buffer has resulted in some polygons being represented more than once - according to how many buffered Reaches the polygon falls into. This is evident at Reach ends and river junctions. Duplicate polygons will be shown to belong to more than one Reach by UniqueID.

Dataset Source: Fragmentation is a derived from the Overall Fractional Cover Count Raster data set, a derivative of the LiDAR source data.

Dataset Originality: Derived

                            
                              Related Documents: None

The Product Description  "ISC2010 Remote Sensing Metrics" describes the remote sensing and mapping approach used to create this and all other ISC2010 data sets.
http://ics.water.vic.gov.au/ics/

http://ics.water.vic.gov.au/ics/