Title

EPBC-listed natural grasslands on the basalt and fine textured alluvial plains of the Namoi Catchment (2010). VIS ID 3852

Data Quality Statement

Name: Data Quality Statement

Protocol: WWW:DOWNLOAD-1.0-http--download

Description:

Data quality statement for EPBC-listed natural grasslands on the basalt and fine textured alluvial plains of the Namoi Catchment (2010). VIS ID 3852

Function: download

Vegetation NamoiCMA grass10 VIS 3852

Name: Vegetation NamoiCMA grass10 VIS 3852

Protocol: WWW:DOWNLOAD-1.0-http--download

Function: download

Code

3bb21b57-60cd-4b17-b4af-9a2c35e185ef

Name

ISO 19115

Edition

2016

Type

vector

Code identifying the spatial reference system

4283

Topic category

Title

ANZLIC Search Words

Reference date

2008-05-16

Coordinate reference system

Authority code

urn:ogc:def:cs:EPSG::

Code identifying the coordinate reference system

5711

End position

N/A

Contact info

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Lineage

1. Existing Liverpool Plains grassland mapping ; An existing map of the possible distribution of the Liverpool Plains grasslands (Lang 2008) was rectified and converted to a shapefile for use in GIS. Lang (2008) used a combination of ground truthing and historical mapping from Portion, Parish and Australian Agriculture Gompany Plans to attempt to delineate the extent of true grassland on the Liverpool Plains. ;
2. Polygons from extant and pre-European maps ; A subset of polygons that could potentially include EPBC-listed native grasslands was extracted from the extant vegetation layer for the Namoi Gatchment. This subset included polygons of the derived and natural occurrences of RVCs 26 and 29 that occurred within the footprint of the pre-1750 extent of grassland on the Liverpool Plains and for the entire floodplain area west of Narrabri, and polygons of derived grassland (RVO 28) that occurred within the footprint of the extent of the Liverpool Plains grasslands as mapped by Lang (2008). ;
3. Other spatial data ; Various GIS layers such as soils landscapes, geology, SPOT imagery, Google Earth, digital elevation models (DEMs), 'nativeness mapping' (Department of Environment and Climate Change DECC 2008) and topographic map mosaic were used to assist in determining the extant and pre-European distribution of the EPBC-listed grassland. ;
4. HISTORIC DATA ; 4.1 Parish plans ; Historic Parish plans for the floodplain area west of Narrabri were accessed via the Department of Lands website (Department of Lands 2009) and any notations referring to vegetation were recorded in a spreadsheet with Parish name, plan year and notation. A point location was also included in a shapefile for each notation. These points were then used as a guide to modifying the pre-European vegetation map and the attribution of derived' grassland polygons. Historical plans for about 90 Parish areas on the floodplain west of Narrabri were viewed on the Department of Lands website. ; 4.2 Lot and DP plans ; Historic plans for individual lots sometimes have notations relating to the vegetation distribution at the time of the survey. As these plans are only available online through purchase, and the area of interest west of Narrabri included thousands of plans, accessing a large number of plans via the website was not considered practical due to time and cost constraints. However, one day was spent in the Department of Lands office in Moree checking and obtaining copies of portion plans in areas of potential grassland between Narrabri and west of Burren Junction. Notations within the plans on vegetation, soils and land form were used as a guide to modifying the pre-European vegetation map and the attribution of 'derived' grassland polygons. ;
5. CONSULTATION ; Several people who have relevant knowledge of grassland communities in the area were consulted to help to gain an understanding of the likely distribution of the EPBC-listed grassland community in the Namoi Catchment. ;
6. FIELD RECONNAISSANCE ; Extensive field checking was carried out by driving many of the public roads, particularly in the floodplain area west of Narrabri. Less field checking was done in the Liverpool Plains area as this had been more of a focus for mapping of grasslands in the extant and pre-European mapping projects (ELA 2009a,b). Many GPS waypoints were recorded to assist mapping of grassland areas and for validation and updating of the extant and pro-European layers. ;
7. UPDATING GRASSLAND MAPPING ; The derived and natural grassland polygons in the extant vegetation map (ELA 2009a) were chocked in GIS using the contextual spatial layers, and tagged in the shapefile attribute table as probable, possible or unlikely to examples of extant patches of the EPBC-listed grassland. Some polygons were also checked during the field checking phase and these were tagged as having been field checked. The likely RVC for all polygons was also added to the attribute table with RVCs 26 and 29 split into a derived occurrence component (26d and 29d) and a natural occurrence component (26t and 29t). Polygons that were observed to have been cropped were deleted from the layer. Only polygons that were attributed as probable were considered to be natural occurrences (26t or 29t). The final layer was cleaned to remove overlapping polygons, identified gaps and polygons of less than 0.1 ha in area. These small polygons were merged into the adjacent polygon which shared the longest common boundary. ;
8. UPDATING EXTANT AND PRE-1750 MAPPING ; The grassland polygons tagged as probable were used to update the extant vegetation map. Various other edits of the pro-European vegetation map were undertaken during the stages described above. The final pre-European layer was then cleaned to remove overlapping polygons, identified gaps and polygons of less than 0.5 ha in area. These small polygons were merged into the adjacent polygon which shared the longest common boundary. A few small polygons (, 0.5 ha) which were coded with highly restricted RVCs were retained in the final layer. The extant layer was then updated in GIS by spatially 'clipping' it with the pre-European layer.; References:; DECC (2008). NSW Interim Native Vegetation Extent (2008-Version 1). Report and data prepared by NSW Department of Environment and Climate Change for the National Land and Water Resources Audit. Project No.DONR 000397. ANZLIC Metadata No. ANZNS0208000244 ; Department of Lands (2009). www.lands.nsw.gov.au/survey rnars/mars and imagery/parish maps ; Eco Logical Australia (2009a). A Vegetation Map for the Namoi Catchment Management Authority. Project No 125-004. Report to the Namoi Catchment Management Authority; Lang, R.D. (2008). Defining the original extent and Iloristic composition of the naturally-treeless grasslands of the Liverpool Plains, North Western Slopes, New South Wales. Cunninghamia. 10(3): 407-421.

Limitations on public access

Effective date

2001-01-01

Effective date

2001-01-01

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact