Communities of National Environmental Significance Database - RESTRICTED - Metadata only

Brief description

## **Abstract**

This dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.



The Database of Communities of National Environmental Significance stores maps, taxonomic, ecological, and management information about Communities of National Environmental Significance listed in the Environment Protection and Biodiversity Conservation (EPBC) Act 1999 as threatened ecological communities.



Credit:

State and Commonwealth Herbaria, Museums and Conservation Agencies Centre for Plant Biodiversity Research Australian Government Department of the Environment, Environmental Resources Information Network



External accuracy:

The positional accuracy of spatial data is a statistical estimate of the degree to which planimetric coordinates and elevations of features agree with their real world values. The planimetric accuracy attainable in the vector data will be composed of errors from three sources:

1. The positional accuracy of the source material

2. Errors due to the conversion processes.

3. Errors due to the manipulation processes.



This specification cannot prescribe a figure for the planimetric accuracy of the existing source material used for capture of community distributions as it has already been produced. The errors due to the digitising process depend on the accuracy of the digitising table set-up or the scanner resolution, systematic errors in the equipment, errors due to software and errors specific to the operator. An accepted standard for digitising is that the line accuracy should be within half a line width.



Non Quantitative accuracy:

Tests are undertaken to ensure that there are no errors in attributes:

- The spatial resolution of the data is reflected in the Presence Categories

- Presence categories are one of:

\\* Community known to occur within area

\\* Community likely to occur within area

\\* Community may occur within area (general indication only)



Conceptual consistency:

Tests undertaken for logical consistency:

- Names of export files and data quality table are correct

- Table names are valid

- Item names in coverages are valid

- Item names are present in coverage attribute files

- Label points and entity point features have only one coordinate pair

- The Arc/Info coverages can be generated, have attributes attached and be 'built'

- In polygon coverages there are no label errors i.e. every polygon has one and only one polygon label point

- Data format, projection and data type are correct

- There are no overshoots, i.e. arc overhangs at intersections (1% error acceptable)

- There are no undershoots, i.e. arcs failing to meet at intersections (0.5% error acceptable)

- There are no new polygons smaller than the minimum specified area (5% error acceptable)

- There are no new linear features shorter than the minimum length (5% error acceptable)

- There are no artefacts such as spikes or deviations visible at 1:125 000 (5% error acceptable)

- Separate covers have exactly coincident lines where intended (5% error acceptable)



Completeness omission:

The database is continually being updated as the lists of threatened ecological communities on schedules of the EPBC Act are amended.



The Species of National Environmental Significance database is available at

https://www.environment.gov.au/science/erin/databases-maps/snes

## **Dataset History**

This dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.



The Spatial information is stored in a geographic information system and links to the Species Profile tables through the community identifier.



Source data were provided from a range of government, industry and non-government organisations.



Testing is carried out using a combination of expert opinion and on-screen checks.

## **Dataset Citation**

Department of the Environment (2015) Communities of National Environmental Significance Database - RESTRICTED - Metadata only. Bioregional Assessment Source Dataset. Viewed 13 March 2019, http://data.bioregionalassessments.gov.au/dataset/c01c4693-0a51-4dbc-bbbd-7a07952aa5f6.