TASVEG, the Tasmanian Vegetation Map
TASVEG, the Tasmanian Vegetation Map| Unique Id | ANZTA0015000012 | ||||||||||
| Title | TASVEG, the Tasmanian Vegetation Map | ||||||||||
| Custodian | Resource Management and Conservation | ||||||||||
| Jurisdiction | Tasmania | ||||||||||
Description | |||||||||||
| Abstract | TASVEG is a Tasmania-wide vegetation map, produced by the Tasmanian Vegetation Mapping Program (TVMP). The TVMP use 154 distinct vegetation communities to produce TASVEG at a scale of 1:25,000. The TASVEG mapping builds on and incorporates the Regional Forest Agreement (RFA) mapping of forest vegetation communities as well as the World Heritage Area (WHA) mapping that was carried out at 1:25,000 scale. Non-forest community types include grasslands, heathlands, scrub, wetlands and saltmarshes as well as riparian and coastal vegetation, woodlands and forest remnants. Recent mapping of plantations by Forestry Tasmania and Private Forests Tasmania has been incorporated into TASVEG. The principal techniques used are aerial photographic interpretation, transformation of that data into digital form and incorporation of external data resources, such as the RFA, WHA and plantation mapping, followed by field verification. The photographic interpretation has been digitised and joined using custom software (PhotoFactory) and attributed with Genamap, a GIS system with a custom-made interface. This data is currently stored in an ArcSDE database. | ||||||||||
| Search Word(s) | VEGETATION Floristic VEGETATION Structural FLORA Native FLORA Exotic | ||||||||||
| Geographic Extent Name(s) | Tasmania | ||||||||||
| Bounding Box |
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Dataset Currency | |||||||||||
| Beginning Date | 1998-04-01 | ||||||||||
| Ending Date | |||||||||||
Dataset Status | |||||||||||
| Progress | In Progress | ||||||||||
| Maintenance and Update | Continual | ||||||||||
Dataset Access | |||||||||||
| Stored Data Format(s) | Digital - ESRI ArcInfo Grid file | ||||||||||
| Available Format Type(s) | Digital - ESRI Shapefiles | ||||||||||
| Access Constraints | Access to TASVEG data is unrestricted. At the time of publication, maps can be provided in either digital or printed form. Maps can be viewed on the Internet at http://www.thelist.tas.gov.au/. TASVEG Version 1.0 will be a static dataset, with ongoing revision to be released at periodic intervals. | ||||||||||
Data Quality | |||||||||||
| Lineage | Aerial photographic interpretation (PI) is the primary data collection method used by the TVMP. Generally 1:42,000 aerial photographs are used, although 1:15,000, 1:12,500 and 1:20,000 scale photographs are used where these are available. The most recent photographs are used where possible, usually post 1996. Digital vegetation layers from TASMAP 1:25,000 series as well as geology maps, various vegetation and ecology texts and maps containing species information assist the aerial PI. Mapping techniques have varied during the life of the project. In the initial stages aerial photographic line-work was drawn on paper maps and digitised by hand. Following technical advances, aerial photographs and PI line-work are now scanned, ortho-rectified, vectorised and joined to form a vegetation layer at 1:25,000 scale in a custom made photogrammetry program (PhotoFactory). The vectorised PI layer is merged with a digital copy of the RFA Forest Vegetation Communities mapping (ANZLIC ID: ANZCW0501001238) as well as WHA vegetation mapping (ANZLIC ID: ANZTA0015000015) where this is available. These layers are tidied and polygons are attributed with tag number, vegetation community code, reliability indicators, condition, disturbance variables, any additional notes and the name of the recorder. The draft map is validated by field-checking and any further corrections are added to the database. | ||||||||||
| Positional Accuracy | The TASVEG data was recorded at a scale of 1:25,000. Aerial photographs used in the mapping process are ortho-rectified and registered to within 15 meters of linear control features (e.g. drainage lines and roads) supplied in digital 1:25,000 topographic maps. Strategic field-checking is used to validate photo-interpretation, with such work being documented in an associated reliability attribute table. | ||||||||||
| Attribute Accuracy | The TASVEG mapping uses 154 non-forest and forest community mapping units. The forest mapping units (which originate from the RFA Forest Vegetation Communities mapping) are based on the dominant forest vegetation layer, with one or more species consistently present. The species composition of the understorey vegetation is not specified in the map unit. Some forest mapping units are also characterised by geology, topographic features, altitude or the height of the dominant trees. The woodland structure, where attributed in the mapping, is classified as having a canopy density of 5-20% solid crown cover (equivalent to 15% projective foliage cover). Non-forest community mapping units may be characterised by geology, environmental and topographic features and dominant species. Field verification of data is strategic, with priority having been given to non-forest community polygons. This is not true for WHA mapping in which all vegetation communities, including forests, were mapped from PI and verified in the field. Data reliability indicators are also recorded, including the scale, age and colour of photography used and other factors such as field-checking, interpolation from ecological principles and use of other data. Disturbances (for example burning or clearing) are also recorded where validated through field-checking and occurrence of any disturbances such as grazing is also recorded, along with a basic record of condition, where known. | ||||||||||
| Logical Consistency | Checking processes include checking the total area of the map, verifying the vegetation community codes against a database list of approved codes, ensuring that all polygons have database entries and that all database entries have corresponding polygons. A recent series of logical consistency checks have been run over the entire data. Broad ecological rules and known geographic distributions were used as a basis to either pass or fail individual polygons depending on their relation to these rules. Neither checks nor changes have yet been made to those polygons that were deemed to fail this test but every polygon has been attributed to signify its status. | ||||||||||
| Completeness | TASVEG data now covers the entire State including its larger islands. Revisions are on-going and are incorporated when ready. | ||||||||||
Contact | |||||||||||
| Contact Organisation | Resource Management and Conservation | ||||||||||
| Contact Position | Coordinator, TVMP | ||||||||||
| Address | 4th Floor | ||||||||||
| 134 Maquarie Street | |||||||||||
| Hobart TAS 7000 | |||||||||||
| Australia | |||||||||||
| Phone | (03) 6233 4501 | ||||||||||
| Facsimile | (03) 6233 3186 | ||||||||||
| Email Address | Anne.Kitchener@dpiwe.tas.gov.au | ||||||||||
Other | |||||||||||
| Metadata Date | 2005-01-04 | ||||||||||
| Additional Metadata | |||||||||||