Title

NVMP Hay Vegetation Map. VIS_ID 4153

Data Quality Statement

Name: Data Quality Statement

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

Description:

DQS - NVMP Hay Vegetation Map. VIS_ID 4153

Function: download

Vegetation_HayNVMP_4153

Name: Vegetation_HayNVMP_4153

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

Description:

File for download

Function: download

Code

f617ad24-418a-4a47-86ad-e4a27a571122

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

Native vegetation information was collected in textual format as survey site data during a botanical survey. Trained botanists visited a series of survey sites (quadrats) and collected plant species data. The location of these quadrats was based on random sampling of Environmental Stratification Units (ESU) generated through stratifying the study area using existing digital spatial layers. Once the survey was completed then botanical records were evaluated using PATN analysis to generate floristic groups. Simultaneously, spatial information was captured through the interpretation of 1:50 000 scale colour aerial photography supplemented by geo-rectified Landsat TM false colour satellite imagery. The aerial photography was dated 12/12/96 and 24/12/97 and the date of the imagery was 27/04/00. Pairs of aerial photographs were viewed in stereo using a stereoscope. This process revealed a series of patterns which reflected soil, landform and vegetation types. Satellite imagery was viewed to aid in pattern identification. In general, patterns were delineated as polygons for the stereo overlap area of each air photo. Polygons were drawn onto individual transparent acetate overlays. The minimum polygon size was 25ha. However, when possible, communities of significance less than 25ha were sometimes delineated. In general, linework from each overlay was then transferred to 1:50 000 transparent mylars, which were referenced to a geo-rectified satellite image to minimise distortion. The final line work was captured digitally through scanning each mylar and was edited and built as a polygon coverage using Genamap GIS software. Nine attributes were captured for each polygon and the accuracy of these attributes was checked with limited fieldwork and corrected if necessary. These attributes were then merged with floristic group data to assist with the assignment of a final vegetation community code, which became a tenth attribute. A new spatial layer was then generated (Native Vegetation (Single Attribute) - Hay 7828). This layer was used to produce a final native vegetation map. The map describes the distribution and extent of extant native vegetation communities and is accompanied by a detailed report.

Limitations on public access

Effective date

1901-01-01

Explanation

Complete spatial coverage for the Hay 7828 1:100 000 map sheet. The minimum polygon size was 25ha, therefore native vegetation communities occupying less than 25ha may not be mapped. However, when possible, communities of significance less than 25ha were sometimes delineated. Nevertheless, some rare plant community types may not be adequately represented.

Effective date

1901-01-01

Explanation

Complete spatial coverage for the Hay 7828 1:100 000 map sheet. The minimum polygon size was 25ha, therefore native vegetation communities occupying less than 25ha may not be mapped. However, when possible, communities of significance less than 25ha were sometimes delineated. Nevertheless, some rare plant community types may not be adequately represented.

Effective date

1901-01-01

Explanation

Genamap GIS software was used to check and edit final spatial information according to standard DIPNR GIS procedures. Topological checks were completed and spatial information was edge matched if necessary using Genamap and UNIX scripts. All lines were tagged, all areas formed and verified, spurious nodes or over-shoots (dangles) were eliminated, all areas were tagged and the attribute tables completed. The final spatial layer was plotted as a hard copy map and visually checked (over a light table) against the base map to ensure that linework and tagging was correct. Edits were carried out where required.

Effective date

1901-01-01

Effective date

1901-01-01

Explanation

The estimated positional accuracy of the line work is between 12.5m and up to 75m, dependent upon the intensity of pre existing location reference data (such as contours, cadastre, etc). The dataset was based partly on the interpretation of 1:50 000 scale colour aerial photography. While most plant communities could be readily identified at this scale, some communities were difficult to positively identify. Also, defining the boundary between communities was sometimes a subjective process. In addition, the extent and distribution of native vegetation communities can expand or contract over time due to environmental influences. These factors should be considered when using the dataset.

Effective date

1901-01-01

Explanation

The dataset was based partly on the interpretation of 1:50 000 scale colour aerial photography. Interpretation methods were based on the standard procedures outlined in the DIPNR (2001) Guidelines for mapping native vegetation (V2.1). Air photo interpreters made every attempt to undertake extensive fieldwork to check and correct polygon attributes. In addition, a three-week floristic survey was undertaken from July 25, 2001 to August 24, 2001. During this time, trained botanists visited a series of survey sites (quadrats) to aid in validating the interpretation. The location of these quadrats was based on random sampling of Environmental Stratification Units (ESU) generated through stratifying the study area using existing digital spatial layers. The Hay 7828 1:100 000 map sheet was partitioned into 33 environmental stratification units using land capability, landscape and coefficient of variation of monthly precipitation spatial layers. This resulted in a total of 108 quadrats being surveyed across the area covered by the dataset. In spite of these efforts, some sections of the study area were not visited

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