New Zealand (WONI) wetlands reviewed for inaccuracy, or loss between 2003 and 2016
Cited Responsible Party
Responsible Party
Individual Name
Peter Newsome
Organisation Name
Landcare Research NZ Ltd
Position Name
Project Manager
Contact Info
Contact
Phone
Telephone
Voice
+64 6 353 4975
Address
Address
Delivery Point
Riddet Road, Massey University
City
Palmerston North
Postal Code
4472
Country
NZ
Electronic Mail Address
newsomep@landcareresearch.co.nz
Abstract
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Environmental Reporting Act 2015 creates a joint obligation on MfE and Statistics NZ for regular national reporting on New Zealand’s environment through synthesis and domain reports. To date, reporting of wetlands has simply compared extent in 2008 with pre-human extent (Environment Aotearoa 2015). To improve the currency of wetland reporting, MfE has contracted Landcare Research to produce an analysis of wetland loss for the period 2005−2016, reported by region. This is a desktop solution involved a visual comparison of the WONI wetlands, as mapped for 2001/02 from Landsat imagery, against 2016 Sentinel-2 satellite imagery. Although this visual inspection was insufficient to capture deterioration in the condition of wetlands, it was sufficient to detect disappearance of wetlands and reduction in their extent with reasonable confidence. Supplementary comments were also made if wetland polygons were seen to be inaccurate or erroneous. Seventy-six percent of the wetlands, comprising a little over half the total national area identified by WONI as wetlands, were recorded as unchanged. Only 214 wetlands (1.5% of the national total) were no longer present. However, 746 (5%) of the WONI wetlands were recorded as partially lost. Six percent of the wetland polygons appeared to be errors. In addition, 11.5% were flagged as correct but in need of improvements in the polygon line work.</SPAN></P></DIV></DIV></DIV>
Purpose
This layer is a compilation of wetland outer boundaries (as depicted by WONI Ausseil et.al. 2008)) intersected with Regional Council (2017) boundaries, with attributes indicating wetland intactness or loss in the period 2003-2016, or inaccuricies in original mapping. It arrises from a review of WONI polygon outlines undertaken by Landcare Research to semi-quantify wetland loss to satisfy the national reporting needs of the Ministry for the Environment.
Credit
Stella Belliss, Landcare Research James Shepherd, Landcare Research
Point Of Contact
Responsible Party
Individual Name
Fiona Hodge
Organisation Name
Ministry for the Environment
Position Name
Contract Manager
Contact Info
Contact
Address
Address
Delivery Point
23 Kate Sheppard Place, P O Box 10362
City
Wellington
Postal Code
6143
Country
NZ
Electronic Mail Address
Fiona.Hodge@mfe.govt.nz
Point Of Contact
Responsible Party
Individual Name
Peter Newsome
Organisation Name
Landcare Research NZ Ltd
Position Name
Project Manager
Contact Info
Contact
Phone
Telephone
Voice
+64 6 353 4975
Address
Address
Delivery Point
Riddet Road, Massey University
City
Palmerston North
Postal Code
4472
Country
NZ
Electronic Mail Address
newsomep@landcareresearch.co.nz
Resource Format
Format
Name
*.xml
Version
Unknown
Resource Constraints
Legal Constraints
Use Limitation
Creative Commons Attribution 3.0 New Zealand by Ministry for the Environment
Representative Fraction
Denominator
Integer
10000
Language
eng
Topic Category Code
environment
Topic Category Code
inlandWaters
Topic Category Code
boundaries
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.1.3497
Extent
EX _ Extent
Description
New Zealand and near offshore islands (excluding Kermadec, Chatham, and sub-antarctic islands)
Wetland outer boundaries (as depicted by WONI (Ausseil et.al. 2008)) were generated by dissolving internal differentiation arising from evidential and classification data to simply depict wetland outlines, attributed as Wetland = 'yes'
Wetlands outlines (of nominally 2003 date) were visually compared with summer 2015/2016 Sentinal 2 imagery and tagged according to whether there has been no loss, partial loss, or complete loss of area, or whether the polygons were either poorly delineated or original error.
This layer was finally intersected with 2017 Regional Council boundaries for analysis and reporting.
