Title

Greater Taree LGA Vegetation 2006. VIS_ID 3911

Data Quality Statement

Name: Data Quality Statement

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

Description:

DQS for Greater Taree vegetation map data

Function: download

Download Package

Name: Download Package

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

Description:

Data and Documents

Function: download

WMS

Name: WMS

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

Description:

Web Map Service

Function: download

REST Service

Name: REST Service

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

Description:

ESRI REST Services directory

Function: download

Code

e39641ed-61b2-4cd4-ae8c-b4e7109c9e77

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

Photography, Mapping Units, Overlays, and Scale

1) Up to date standard LIC colour photography at a nominal scale of 1:25,000 was used to delineate all vegetation communities. Photo date was mostly 1997, but some was at 1993 (Upper Manning)

2) All mapping was based on the standard LIC 1:25000 map sheet unit.

3) Within each Map Sheet overlays were produced showing the existing vegetation types, cadastral information, and drainage patterns.

4) These overlays were produced at a scale as close as possible to the photo scale. Most 1:25,000 photos are at a nominal scale of 1:25,000 only. The variation on this job was from about 1:23,000 to 1:28,900. The scale for each 1:25,000 map sheet area was calculated and then the overlays produced at that scale to ‘best fit’ the photo. Scale is dependant on ground height above sea level , so it can vary across a 1:25, 000 sheet as height varies. In extreme cases, such as the Bobin sheet, the overlays were at different scales across the 1:25,000 sheet because of the extreme altitude variation as the terrain rose from low areas to the Comboyne plateau. Each 1:25,000 sheet was split into A4 sheets and an overlay produced for each A4 sheet.

Use of Overlays



The overlay was laid over the appropriate photo, using the cadastral and drainage information to fit the overlay to the photo, and then the existing linework was modified and/or new linework added as required.  This worked extremely well on the flatter eastern part of the Shire where generally portion boundaries could easily be fitted to fence lines visible on the photos.



In the less developed, i.e. more timbered areas of the western parts of the  Shire, there were few portion boundaries visible and the drainage pattern was used to fit the overlay to the photo. This was generally satisfactory, but proved difficult in steep areas where the resulting mapping will be less accurate (in terms of line placement), but still within acceptable limits.



It became obvious as the mapping proceeded that there were a lot of changes to the original linework and the job became very complex. Large areas had been mapped as the one community with no variation, whereas in fact the area contained a complex pattern of vegetation communities.

Problems

Date of Photography

It must be remembered that all mapping is at photo date which is 1997 for all areas, except Upper Manning (western areas) which is 1993. This caused problems on the join between Upper Manning and Wingham 1:100,000 sheets because of date change. Some areas shown as timbered on the 1993 photos were, in fact, cleared on the 1997 photos. Where possible the latest clearing was delineated.



The Upper Manning Sheet is bound to be quite out of date, in terms of clearing,

because of the 1993 photo date.

Problems with scale

The scale as calculated on each 1:25,000 Map Sheet was based on the average height ASL; however, scale could vary enormously over the Map Sheet, depending upon how steep and variable the height ASL was.  The greater the height changes, the greater the scale changes and the more difficult it was to fit the overlay to the photo. In some steep mountainous areas, the overlays did not fit very well to the photos in places and the line placement is therefore less accurate, but generally still within acceptable limits. Some map sheets had overlays at two different scales to deal with this problem, e.g. Bobin.

Problems with Line Shift

There appeared to be a Line Shift with the original mapping. Because of the use of cadastral information on the overlay, the overlay could be accurately fitted to the photo in an area and it was evident that patches of vegetation as originally mapped were in the wrong place. This shift has not been explained and was variable across Map Sheets. The shift was often up to about 3mm.  This caused significant problems in the mapping as this original line work needed to be redrawn.

Problems with photo Quality

Photo quality was very variable across the Shire and was often of a poor quality that made interpretation quite difficult. The problem is the colour balance, which can be very variable, and in some cases make the photos almost useless The Yarrowitch photos are very green and make separation of the vegetation types almost impossible.  The Wingham Sheet, which covered a large area of the Shire, was the best, Upper Manning and Yarrowitch were the worst.

Problems with Field Access

Time and cost constraints meant minimal fieldwork for each Map Sheet. It was not possible in the time available to get permission from land  holders to access their land. Hence all fieldwork was done by travelling public roads and this information was marked on field overlays and later used to map the vegetation communities. The State Forest and National Park vegetation maps were also used as a source of vegetation community information in the area.





However, there were some problem areas where there was virtually no access. These areas had different vegetation communities that were not previously encountered or only infrequently encountered and presented problems.  Some additional FieldWork may need to be done in these areas to improve the typing. These areas will be shown on a map.

Problems with joining to SF and NP mapping

The vegetation mapping was joined up with State Forest and National Parks vegetation mapping. However in some areas this could not be done.

1. Sometimes a line in SF will not join with the new vegetation mapping because two different State Forest types are represented by one Council type, or conversely two Council types are represented by only one SF type.

2. Sometimes the SF mapping was considered to be wrong, for various reasons and it could not be joined. Sometimes new linework was plotted in the SF but this may be lost in Council’s maps, through the digitising process involved.

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