Declared Weeds (points, lines and polygons) draws observation records from the Natural Values Atlas (NVA) of Tasmania of weeds that are listed as declared pests under the Biosecurity Act (2019). Understanding the distribution of weeds is integral to prioritising weed management activities and measuring outcomes of that work. The Natural Values Atlas (NVA) of Tasmania supports the administration of the Biosecurity Act (2019) through maintaining a centralised database that provides for secure and effective storage, retrieval and backup of weed data. Declared Weeds (Points), for any given species, is indicative only; it is a collection of observation records and not a definitive map of a species’ distribution or abundance. Potential data errors may include: inaccurate records (wrong ID/location), 'missing' records (not detected/reported), and 'historical' records (no longer present). Comprehensive, high quality data provides for better decision-making and relies on communal efforts to collect and share weed observations by submitting records to the NVA.

Data has been collected from existing NVA data, NRM Regions, State Govt, NGO's and consultants. Ongoing data may be provided by Weed stakeholders in Tasmania.

Position Accuracy: Variable subject to source of data. Data collected post Aug 2010 will have an mandatory accuracy field completed. Attribute Accuracy: Attribte accuracy prior to Aug 2010 is variable due to a lack of agreed format prior to this time. Data collected post Aug 2010 will be required to meet the standard set for Weed DB collection. This includes some mandatory fields with domains. Logical Consistency: Data has been checked for duplicates. Completeness: Data collection is ongoing and subject to provision of records to the Natural values Atlas. By its nature, the Weed database con never be current or complete. Additional: Can store Point, Line and Polygon data