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Persistent waterholes derived from Landsat archive for NAWRA

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About this Collection

Persistent waterholes derived from Landsat archive for NAWRA


Persistent waterholes provide important refuge habitats. Waterhole persistence data shows the percentage of years where surface water has been identified along the stream channels during the driest period of the dry seasons from 1988 to 2015 and is derived from Landsat imagery. This dataset was created for the CSIRO Northern Australia Water Resourc... more


Environmental Management Environmental Monitoring


https://doi.org/10.25919/5bba9d0e3d19e


1988


2015


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NAWRA Fitzroy catchment (Western Australia) Darwin catchments (Northern Territory) Mitchell catchment (Queensland) Regional development Landsat Persistent waterholes


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NAWRA spatial data explorer


Landsat_PersistentWaterholes_metadata_details_for_DAP.docx


The following steps were performed to derive the persistent waterholes maps: • Five to eight streamflow gauges, distributed across each catchment, were used to identify the end of the dry season as well as the length of the dry season from 1988 to 2015. No-flow was defined as zero ML/day. • The end- of- dry- season date was used to identify the last Landsat scene before the start of the wet season (this was based on available imagery with minimal cloud cover) for each year from 1988 to 2015. In some cases, potential waterholes were obscured by cloud. Other times there were nulls in the ETM data; in May 2003 the ETM sensor had a Scan Line Corrector (SLC) error resulting in strips of null data across much of the scene. Hence a persistent waterhole was identified based on the number of cloud-free (and null-free) observations at the end of the dry season. • A selection of images (three to five) from the end of the dry season (from 1988–2015) from each Landsat row/path scene were visually examined to identify the best threshold to use for the NDWIXu (Xu 2006) to create a water mask (a value of -0.3 was found to be suitable for all areas). • The Landsat NDWIXu water-masked images from the end of each dry season from 1988 to 2015 were used to identify the waterholes persisting at the end of every dry season (based on available and cloud-free observations). Those pixels identified as water at the end of most of the dry seasons are potentially persistent waterholes. In-channel masks were used to remove surface water identified outside the watercourse using a distance of 500 m buffer from streamlines. Large dams were manually removed when necessary.


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


CSIRO (Australia)


Ticehurst, Catherine (2018): Persistent waterholes derived from Landsat archive for NAWRA. v1. CSIRO. Data Collection. https://doi.org/10.25919/5bba9d0e3d19e


All Rights (including copyright) CSIRO 2018.


The metadata and files (if any) are available to the public.

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Location Details

12°1′12″ S


19°21′0″ S


145°33′0″ E


123°2′60″ E


WGS84


About this Project

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... more


Cuan Petheram





Catherine Ticehurst


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