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Water count and water prevalence - NSW

This dataset indicates the presence and persistence of water across New South Wales between 1988 and 2012. Water is one of the world’s most important resources as it’s critical for human consumption, agriculture, the persistence of flora and fauna species and other ecosystem services. Information about the spatial distribution and prevalence of water is necessary for a range of business, modelling, monitoring, risk assessment, and conservation activities. For example, one of the necessary steps in the NSW State-wide Landcover and Trees Study (SLATS), which monitors vegetation change and is used in the production of vegetation maps, involves removing non-vegetative features such as water bodies through water masking.


Water count

The water count product is based on water index and water masks for NSW (Danaher & Collett 2006), and represents the proportion of observations with water present across the Landsat time series as a fraction of total number of possible observations in the 25yr period (1 Jan 1988 to 31 Dec 2012). The product has two bands where band 1 is the number of times water was present across the time series, and band 2 is the count of unobscured (i.e. non-null) input pixels, or number of total observations for that pixel. Cloud, cloud-shadow, steep slopes and topographic shadow can obscure the ability to count water presence.


Water Prevalence

The water prevalence product is extracted from the water count product and provides a measure of the relative persistence of water in the landscape (e.g. from always present to rarely and never present). There are 12 classes representing the percentage of time a pixel has had water present out of the total number of observations for that pixel (i.e Band 1/Band 2 of the water count product). Water prevalence mapping provides information for multiple, wide-reaching applications. For example, distance to locations of persistent water bodies can be modelled as a contributing indicator of potential biodiversity refugia.


Files align with Landsat paths and rows (see https://www.usgs.gov/core-science-systems/nli/landsat/landsat-tools), with files for water count denoted 'dd7' and water prevalence 'ddh'.

Simple

Identification info

Date (Creation)
1988-11-19
Date (Publication)
2021-09-22
Date (Revision)
2014-07-14
Edition
1.0

Identifier

Title
DataCite
Code
doi:10.25901/amd6-3113
Codespace
http://dx.doi.org

Publisher

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
+61 7 3365 9097

Author

Office of Environment and Heritage (2011-2019), New South Wales - ()
320 Pitt St Sydney NSW 2000 Australia
Sydney
NSW
2000
Australia
Website
https://www.tern.org.au/

Purpose
The maps are intended for rural landscapes and are suited to many applications including: - property planning - local government planning - flood risk assessment and management - habitat identification and mapping - analyses of potential biodiversity refugia - analyses of landscape change and resilience
Credit
We at TERN acknowledge the Traditional Owners and Custodians throughout Australia, New Zealand and all nations. We honour their profound connections to land, water, biodiversity and culture and pay our respects to their Elders past, present and emerging.
Credit
This work was funded by Local Land Services and completed by the Joint Remote Sensing Research Program and the NSW Office of Environment and Heritage. Landsat data was sourced from the United States Geological Survey.
Status
Completed

Point of contact

Terrestrial Ecosystem Research Network - Librarian, Data ()
Building 1019, 80 Meiers Rd Indooroopilly QLD 4068 Australia
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
Topic category
  • Environment
  • Geoscientific information
  • Imagery base maps earth cover

Extent

Description
New South Wales, Australia
N
S
E
W


Temporal extent

Time period
1988-01-01 2012-01-01

Vertical element

Minimum value
0.0
Maximum value
0.0
Reference system type
Geodetic Geographic 3D
Title
Fisher, A., N. Flood, and T. Danaher. (2016) Comparing Landsat Water Index Methods for Automated Water Classification in Eastern Australia. Remote Sensing of Environment. doi:10.1016/j.rse.2015.12.055
Website
Fisher, A., N. Flood, and T. Danaher. (2016) Comparing Landsat Water Index Methods for Automated Water Classification in Eastern Australia. Remote Sensing of Environment. doi:10.1016/j.rse.2015.12.055

Related documentation

Title
NSW OEH (2015) Water count and water prevalence fact sheet
Website
NSW OEH (2015) Water count and water prevalence fact sheet

Related documentation

GCMD Science Keywords
  • EARTH SCIENCE REANALYSES/ASSIMILATION MODELS
  • BIOSPHERE
  • WATER MANAGEMENT
  • SURFACE WATER FEATURES
  • FLOOD FREQUENCY
  • INUNDATION
ANZSRC Fields of Research
  • Freshwater Ecology
  • Agricultural Land Management
  • Surfacewater Hydrology
  • Wildlife and Habitat Management
TERN Platform Vocabulary
  • LANDSAT-5
  • LANDSAT-7
TERN Instrument Vocabulary
  • TM
  • ETM+
TERN Parameter Vocabulary
  • water count
  • Unitless
  • water prevalence
  • Unitless
GCMD Horizontal Resolution Ranges
  • 1 meter - < 30 meters
GCMD Temporal Resolution Ranges
  • Weekly - < Monthly

Resource constraints

Use limitation
The Creative Commons Attribution 4.0 International (CC BY 4.0) license allows others to copy, distribute, display, and create derivative works provided that they credit the original source and any other nominated parties. Details are provided at https://creativecommons.org/licenses/by/4.0/
File name
88x31.png
File description
CCBy Logo from creativecommons.org
File type
png
Linkage
https://w3id.org/tern/static/cc-by/88x31.png

Title
Creative Commons Attribution 4.0 International Licence
Alternate title
CC-BY
Edition
4.0
Website
https://creativecommons.org/licenses/by/4.0/

Access constraints
License
Use constraints
Other restrictions
Other constraints
These data can be freely downloaded and used subject to the CC BY licence. Attribution and citation is required. Please send citations of publications arising from work that use these data to tern@uq.edu.au .
Other constraints
Known Issues - Map accuracy - the water mask classified raining data with 1.4% misclassification. - Artificial striping in Landsat 7 imagery, associated with the edges of flight paths. - Ghosting - where a single date of poorly rectified Landsat images causes an offset in the water mask by some distance to the rest of the time series. This is particularly apparent for permanent water bodies such as wide river channels and large dams.
Other constraints
TERN services are provided on an “as-is” and “as available” basis. Users use any TERN services at their discretion and risk. They will be solely responsible for any damage or loss whatsoever that results from such use including use of any data obtained through TERN and any analysis performed using the TERN infrastructure. Web links to and from external, third party websites should not be construed as implying any relationships with and/or endorsement of the external site or its content by TERN.

Resource constraints

Classification
Unclassified
Supplemental Information
Files align with Landsat paths and rows (see https://www.usgs.gov/core-science-systems/nli/landsat/landsat-tools), with files for water count denoted 'dd7' and water prevalence 'ddh'.

Distribution Information

Distributor

Distributor

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
+61 7 3365 9097
OnLine resource
/attachment/4e391ec1-87a5-4bfb-9b51-997b87473494/band_descriptions_and_filenaming_convention_UTM-v01_69wSxEr.txt

Distribution Information

Distributor

Distributor

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd, Indooroopilly, QLD, Australia, 4068
Indooroopilly
QLD
4068
Australia
OnLine resource
Water count and water prevalence

OnLine resource
Landsat Path Row KML files

Data quality info

Hierarchy level
Dataset

Report

Result

Statement
The following issues were identified: Map accuracy - the water mask classified training data with 1.4% misclassification. Artificial striping in Landsat 7 imagery, associated with the edges of flight paths. Ghosting - where a single date of poorly rectified Landsat images causes an offset in the water mask by some distance to the rest of the time series. This is particularly apparent for permanent water bodies such as wide river channels and large dams.

Resource lineage

Hierarchy level
Dataset

Process step

Description
Water index & water mask: The water index is developed by detecting water and non-water signatures from Landsat satellite imagery for a single date. The water mask is derived from the water index, based on research of an optimal threshold of water discrimination (Danaher & Collett 2006). Water presence/absence is assessed for each 30m Landsat pixel. This is the primary product used to develop the water count and water prevalence products, which are based on the Landsat time series (1 Jan 1988 to 31 Dec 2012).

Process step

Description
Water count: The water count product is calculated, per pixel, as the sum of number of observations with water present across the Landsat time series as a fraction of total number of possible observations in the 25 year period (1 Jan 1988 to 31 Dec 2012).

Process step

Description
Water prevalence: The water prevalence product is extracted from the water count product and classified by proportions of observations with water present.

Reference System Information

Reference system identifier
EPSG/EPSG:4326

Reference system type
Geodetic Geographic 2D

Metadata

Metadata identifier
urn:uuid/4e391ec1-87a5-4bfb-9b51-997b87473494

Title
TERN GeoNetwork UUID

Language
English
Character encoding
UTF8

Point of contact

Terrestrial Ecosystem Research Network
Building 1019, 80 Meiers Rd
Indooroopilly
QLD
4068
Australia
+61 7 3365 9097

Type of resource

Resource scope
Dataset
Metadata linkage
https://geonetwork.tern.org.au/geonetwork/srv/eng/catalog.search#/metadata/4e391ec1-87a5-4bfb-9b51-997b87473494

Point-of-truth metadata URL

Date info (Creation)
1988-11-19T00:00:00
Date info (Revision)
2016/06/20T00:00:00

Metadata standard

Title
ISO 19115-1:2014/AMD 1:2018 Geographic information - Metadata - Fundamentals
Edition
1

Metadata standard

Title
ISO/TS 19115-3:2016
Edition
1.0

Metadata standard

Title
ISO/TS 19157-2:2016
Edition
1.0
Title
Terrestrial Ecosystem Research Network (TERN) Metadata Profile of ISO 19115-3:2016 and ISO 19157-2:2016
Date (published)
2021
Edition
1.0

Identifier

Code
10.5281/zenodo.5652221
Website
https://github.com/ternaustralia/TERN-ISO19115/releases/tag/v1.0

 
 

Overviews

Spatial extent

N
S
E
W


Keywords

ANZSRC Fields of Research
Agricultural Land Management Freshwater Ecology Surfacewater Hydrology Wildlife and Habitat Management
GCMD Science Keywords
BIOSPHERE EARTH SCIENCE REANALYSES/ASSIMILATION MODELS FLOOD FREQUENCY INUNDATION SURFACE WATER FEATURES WATER MANAGEMENT

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Read here the full details and access to the data.

Associated resources

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