2010 Index of Stream Condition - Vegetation Overhang polygon features
dataset:
ISC2010_VEGETATION_OVERHANG
The ISC2010_VEGETATION_OVERHANG polygon features represent areas of vegetation that partially or wholly overhang the Stream Bed. The data set contains the whole vegetation polygon, not only the overhanging part of the polygon. Candidate vegetation is defined as vegetation cover greater than 20%. Vegetation Overhang has been mapped within a 200m buffer of the ISC2010_STREAMBED_WIDTH feature. This data set is derived from source Fractional Cover raster data. The data set also contains additional polygon divisions created by the introduction of Side and 200m buffer boundaries. Small polygons (<10m2) that were created by the introduction of these boundaries have been removed.
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.
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Citation proposal Citation proposal
(2014) 2010 Index of Stream Condition - Vegetation Overhang polygon features Department of Environment, Land, Water & Planning https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/d371ff80-1e32-59ab-91c9-717bb99acf8c |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
Description
- Title
- 2010 Index of Stream Condition - Vegetation Overhang polygon features
- Alternate title
- ISC2010_VEGETATION_OVERHANG
- Resource Type
- Dataset
- Purpose
- The ISC2010_VEGETATION_OVERHANG features are used in the assessment of the Vegetation Overhang sub-index where the linear proportion of vegetation that overhangs the stream bed contributes to the Vegetation Overhang Score.
- Supplemental Information
- 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/
- Status
- Completed
Temporal
- Time period
- 2010-06-012012-12-01
Spatial
- Spatial representation type
- Vector
- Horizontal Accuracy
- 50m
- Code
- 4283
- Description
- General - Victoria
N
S
E
W
Maintenance
- Maintenance and update frequency
- Not planned
Format
Contacts
Point of contact
Department of Environment, Land, Water & Planning
-
Wilson Paul Mr
(Team Leader Water Assessment & Research)
level 12/8 Nicholson street
East Melbourne
Vic
3002
Australia
Cited responsible party
No information provided.
Cited responsible party
No information provided.
Cited responsible party
No information provided.
Cited responsible party
No information provided.
Keywords
- Topic category
-
- Elevation
- Inland waters
- Imagery base maps earth cover
- Transportation
Resource Constraints
- Classification
- Unclassified
Lineage
- Statement
- Dataset Source: Vegetation Overhang is derived from from the Overall Fractional Cover Count Raster data set, a derivative of the LiDAR source data. Dataset Originality: Derived
Metadata Constraints
- Classification
- Unclassified
Quality
Attribute Quality
- Comments
- The UniqueID that describes the Basin and Reach that each Vegetation Overhang polygon falls in is recorded.
Positional Accuracy
- Comments
- +/- 1m
Conceptual Consistency
- Comments
- Vegetation Overhang has been mapped the same way across the entire ISC2010 network. Vegetation Overhang polygons were extracted from source rasters on a Reach by Reach basis using a 200m buffer and then combined. At Reach ends, the extraction by 200m 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.
Missing Data
- Comments
- Vegetation Overhang has been mapped for the entire ISC2010 network within a 200m buffer of Stream Bed.
Excess Data
Overviews
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d371ff80-1e32-59ab-91c9-717bb99acf8c
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Associated resources
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