This is a derived dataset that delineates the Bioregional Conservation Status of EVCs. (NV2005_EVCBCS) .

The dataset is derived from a combination of Victorian bioregions (VBIOREG100), Pre 1750 EVCs (NV1750_EVC) and the current version of Native Vegetation Extent (NV2005_EXTENT). Bioregional conservation status and geographic occurrence are applied to unique Bioregion-EVC units.

The dataset underpins the implementation of Victoria's Native Vegetation Management Framework, and the preparation of Regional Vegetation Plans in addition to other biodiversity planning. The dataset requires upgrading when any of the three input datasets change.
(Note that this dataset is stored in two Spatial Data Storage Environments within DSE - Arc/Info tiled libraries and Oracle/SDE single data layer. This metadata describes the Arc/Info dataset. The Oracle/SDE dataset is slightly different in that all non-vegetation classes are excluded from the data (ie. Bare rock, sand, non-native vegetation etc.) also the attributes include attributes expanded from Look Up Tables. These have an X_ prefix in the name.)

Note erratum under Data Quality-Completeness-Classification

This is a derived dataset that delineates the Bioregional Conservation Status of EVCs. (NV2005_EVCBCS) .

The dataset is derived from a combination of Victorian bioregions (VBIOREG100), Pre 1750 EVCs (NV1750_EVC) and the current version of Native Vegetation Extent (NV2005_EXTENT). Bioregional conservation status and geographic occurrence are applied to unique Bioregion-EVC units.

The dataset underpins the implementation of Victoria's Native Vegetation Management Framework, and the preparation of Regional Vegetation Plans in addition to other biodiversity planning. The dataset requires upgrading when any of the three input datasets change.
(Note that this dataset is stored in two Spatial Data Storage Environments within DSE - Arc/Info tiled libraries and Oracle/SDE single data layer. This metadata describes the Arc/Info dataset. The Oracle/SDE dataset is slightly different in that all non-vegetation classes are excluded from the data (ie. Bare rock, sand, non-native vegetation etc.) also the attributes include attributes expanded from Look Up Tables. These have an X_ prefix in the name.)

Note erratum under Data Quality-Completeness-Classification

A Bioregional Conservation Status of vegetation types (Ecological Vegetation Classes) has been assigned to support the management of biodiversity values in Victoria. The dataset identifies unique combinations of Victorian bioregions and extant EVCs which have been assigned a conservation status rating.  

The dataset underpins the implementation of Victoria's Native Vegetation Management Framework which defines how the Bioregional Conservation Status of an EVC is used in determining the conservation significance for biodiversity purposes, and management implications. 

The layer will primarily support flora and fauna biodiversity evaluations and management. The layer is used to define National Vegetation Information System (NVIS) units (ie. a Bioregion-EVC combination equates to a unique NVIS description) NVIS descriptions are managed in the Victorian Vegetation Information System (VicVIS).

Refer to metadata for input datasets

Refer to metadata for input datasets

There is a logical consistency between combinations of Victorian Bioregions and EVCs and the assigned Bioregional Conservation Status (EVC_BCS) and Geographic Occurrence (EVC_GO) of EVC attributes.

There is a logical consistency between bioregion numbers, codes and names, and between EVC numbers and names.

Dataset Source: This is a derived dataset see source datasets for history. When any of the source datasets change this dataset is rederived.

The dataset is derived from a combination of Victorian bioregions (VBIOREGION100), Pre 1750 EVCS (NV1750_EVC) and the current extent of Native Vegetation (NV2005_EXTENT).Bioregional conservation status & geographic occurrence is applied to unique Bioregion EVC units. The boundaries and key attributes from the source datasets are found in this derived dataset. 

The key attributes, Bioregional Conservation Status (EVC_BCS) and Geographic Occurrence (EVC_GO) of EVCs, have been assigned to Bioregion/EVC combinations on the basis of an expert interpretation of statistical and spatial information by Alison Oates & David Parkes, Biodiversity & Ecosystem Services, DSE with the support of other DSE staff. The source information for these two attributes is maintained in a separate database that is linked to the NV1750_EVC/NV2005_EXTANT/VBIOREG100 combination dataset to create NV2005_EVCBCS. The source table is maintained by Biodiversity & Ecosystem Services

The approach to assessing bioregional conservation status and geographic occurrence of vegetation types (Ecological Vegetation Classes) is described in Appendix 2 of DSE's, 'Victorias Native Vegetation Management - A Framework for Action', 2002.


Dataset Originality: Derived

                            
                              Relationship to other Datasets: The dataset is derived from a combination of Victorian bioregions (VBIOREG100), the pre 1750 EVC dataset (NV1750_EVC) and the current extent of native vegetation (NV2005_EXTENT), with an assigned conservation status on the basis of unique Bioregion EVC units. The boundaries and key attributes from both datasets are found in this derived dataset. 

This dataset is part of a series of native vegetation datasets, which have the following naming convention - NV{year}-ATTRIBUTE(s):
NV2005_EXTENT - Modelled extent of native vegetation (very broad categories)
NV1750_EVC - Mapped pre 1750 ecological vegetation classes (EVCs) distribution
NV1750_EVCBCS - Mapped pre1750 EVC distribution with Bioregional Conservation Status derived from NV1750_EVC and VBIOREGION100 and depletion statistics, also contains  pre1750 geographic occurrence of EVCs
NV2005_EVCBCS - Extant EVC distribution with Bioregional Conservation Status derived from NV1750_EVCBCS and NV2005_EXTENT , also contains pre1750 geographic occurrence 
NV2005_QUAL - Modelled Native Vegetation Quality - includes modelled site condition and patch-based landscape context
NV2005_LSIMP - Landscape Scale native vegetation importance and connectivity derived from NV2005_EVCBCS, NV2005_QUAL and landscape connectivity

Current Design Issues: The layer design supports the assignment of the Bioregional Conservation Status of EVCs that is assigned to unique combinations of Victorian Bioregions and EVCs. The dataset also identifies the Geographic Occurrence of EVCs at a Bioregional level which is assigned on the same basis.

Since most users will require information about the EVC and Bioregion in addition to the Bioregional Conservation Status rating, most EVC and Victorian Bioregion dataset attributes have been retained in the dataset.

Since a number of different types of vegetation are included in the extant EVC dataset, an additional Map Unit Type field has been provided to advise users of where and why Bioregional Conservation Status and Geographic Occurence are not relevant.

Related Documents: An Interim Biogeographic Regionalisation for Australia: a framework for establishing the national system of reserves, Version 4.0. - R. Thackway and I.D.Cresswell (1995) (eds)
Australian Nature Conservation Agency, Canberra.

Peel, B (in prep) A Typology for Vegetation in Victoria: towards a census of Victorian plant communities, NRE, Melbourne.
EVC Benchmark descriptions on the DSE external website (dse.vic.gov.au)
Metadata for NV1750_EVC, NV2005_EXTENT and VBIOREG100