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Dry-season wetlands derived from Landsat archive for NAWRA
Dry-season wetlands data show the average value derived from each season’s maximum number of consecutive days where surface water has been identified during the dry seasons from 1988 to 2016 from Landsat imagery. This dataset was created for the CSIRO Northern Australia Water Resource Assessment (NAWRA) project.
These data are maps of dry-sea... moreson wetlands derived from the Landsat archive from 1988 to 2016 (i.e. 29 years). The Landsat archive data were extracted from Geoscience Australia’s Surface Reflectance NBAR product available on the National Computing Infrastructure. The method used to derive the surface water maps is described in the NAWRA technical report (Sims et al., 2016). The data are provided as average number (from the 29 years of Landsat data) of the maximum consecutive days of inundation during each dry season. The average number of maximum consecutive days is then converted into shape files: one showing all pixels containing an average value of 50 or more maximum consecutive days of inundation from all the dry seasons; the other showing all pixels containing an average value of 100 or more maximum consecutive days of inundation from all the dry seasons.
More information is provided in the supporting attachment. less
Fitzroy catchment (Western Australia)
Darwin catchments (Northern Territory)
Mitchell catchment (Queensland)
The following steps were performed to derive the dry-season wetland maps:
• The Landsat maps of surface water (described in Sims et al., 2016) for each dry season (defined as May to October) were used to estimate the maximum number of consecutive days that each pixel is inundated. For pixels obscured by cloud cover, if they were mapped as water before and after a period of cloud cover then the pixel was inferred to be inundated for the full duration. If the pixel was dry at the end of the cloudy period then the pixel was assumed to be dry since the last flooded image.
• The average value of maximum consecutive days of inundation from each dry season was then calculated.
• To help reduce commission errors, especially where water is mistakenly mapped due to dark shadows from steep topography, the null layer from Geoscience Australia’s Water Observations from Space (WOfS) dataset was used to mask out these areas. In the Fitzroy region, where areas were still incorrectly mapped as permanent water due to the unique topography of the area, an additional step was taken to remove erroneous water features. In this situation, another mask was created based on the maximum water extent as identified from the WOfS archive. This mask can be used on a dry season product since it is not analysing extreme flood events.
The Australian Government commissioned CSIRO to complete the Northern Australia Water Resource Assessment (NAWRA) - an initiative of the Australian Government’s White Paper on Developing Northern Australia and the Agricultural Competitiveness White Paper, the government’s plan for stronger farmers and a stronger economy. Aspects of the Assessment were undertaken in conjunction with the Northern Territory Government, the Western Australian Government, and the Queensland Government.
Creative Commons Attribution 4.0 International Licence
Ticehurst, Catherine (2018): Dry-season wetlands derived from Landsat archive for NAWRA. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2018.
The metadata and files (if any) are available to the public.
Northern Australian Basin Assessment:: Water Resource Assessments
This metadata record relates specifically to the stated body of work and was created for the Northern Australia Water Resource Assessment (NAWRA) project. The NAWRA project has undertaken a comprehensive and integrated evaluation of the feasibility, economic viability and sustainability of water resource development in three priority areas in north... moreern Australia: the Fitzroy catchment (WA), the Darwin catchments and the Mitchell catchment (Qld).
Functionally, NAWRA implemented an activities-based approach with the following activity groups: climate, land suitability, surface water hydrology, groundwater hydrology, agriculture and aquaculture viability, water storage, socio-economics, Indigenous water values, rights and development aspirations, and aquatic and marine ecology contributing to the results.
The Assessment examined resource use unconstrained by legislation or regulations, and examined the monetary and non-monetary values associated with existing use of those resources, to enable a wide range of stakeholders to assess for themselves the costs and benefits of given courses of action. NAWRA is fundamentally a resource evaluation. This project did not seek to advocate irrigation development or assess or enable any particular development; rather it identified the resources that could be deployed in support of potential irrigation enterprises, evaluated the feasibility of development (at a catchment scale, not for individual paddocks or businesses) and considered the scale of the opportunities that might exist to support deliberation and decisions concerning sustainable regional development.
This metadata record relates to data collected and created by the Flood Modelling activity during the NAWRA project. The full complement of NAWRA publications can be accessed online at https://publications.csiro.au/ less
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