Intertidal Extents Model Relative Extents Model  

Authors / CoAuthors

Abstract

The Intertidal Extents Model (ITEM v1.0) product is a national scale gridded dataset characterising the spatial extents of the exposed intertidal zone, at intervals of the observed tidal range. The current version utilises all Landsat observations (5, 7, and 8) for Australian coastal regions (excluding off-shore Territories) between 1987 and 2015 (inclusive). The Relative Extents Model (ITEM_REL_mosaic_1987_2015.tif) utilises the tidal information attributed to each tile observation to indicate the spatial extent of intertidal substratum exposed at each 10% percentile of the observed tidal range for the cell. Attributes: Single Band Integer Raster: 0 - Always water 1 - Exposed at lowest 0-10% of the observed tidal range 2 - Exposed at 10-20% of the observed tidal range 3 - Exposed at 20-30% of the observed tidal range 4 - Exposed at 30-40% of the observed tidal range 5 - Exposed at 40-50% of the observed tidal range 6 - Exposed at 50-60% of the observed tidal range 7 - Exposed at 60-70% of the observed tidal range 8 - Exposed at 70-80% of the observed tidal range 9 - Exposed at highest 80-100% of the observed tidal range (land) -999 - No Data

Product Type

dataset

eCat Id

100482

Contact for the resource

Digital Object Identifier

http://dx.doi.org/10.4225/25/575F683E2A3AF

Keywords

theme.ANZRC Fields of Research.rdf

• EARTH SCIENCES

GCMD Keywords

• Earth Science | OceansEarth Science | Terrestrial HydrosphereEarth Science | Oceans | Tides

( Data centre )

• NCI

( Product )

• Intertidal Extents Model

• Published_External

Publication Date

2016-06-14T16:00:00

Creation Date

2016-06-02T14:00:00

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

The purpose of the ITEM v1.0 product is to assist in understanding the extent and elevation profile of the Australian intertidal zone. Examples of where this knowledge can contribute include environmental monitoring applications for migratory bird species, habitat mapping in coastal regions, hydrodynamic modelling, and geomorphology studies of features in the intertidal zone. Through attribution of the LOT and HOT values modelled for each cell, the extents model can be used to derive an elevation profile of the observed intertidal zone extent on a cell by cell basis. The method employed can be tailored based on user requirements. For example, by dividing the observed tidal range for a cell (HOT-LOT) into 10% interval values, contours can be assigned to the section of the Intertidal Extents Model contained in that cell. These can then be used as a standalone elevation data source, or interpolated to create a continuous intertidal digital elevation model for the cell. The ability to create an elevation model relative to MSL enables the data to be integrated as a complimentary data source, linking shallow water bathymetry and terrestrial elevation models.

Maintenance Information

asNeeded

Topic Category

geoscientificInformation

Series Information

Lineage

The Relative Extents Model (ITEM_REL_mosaic_1987_2015.tif) utilises the tidal information attributed to each tile observation to indicate the spatial extent of intertidal substratum exposed at each 10% percentile of the observed tidal range for the cell. Attributes: Single Band Integer Raster: 0 ¿ Always water 1 ¿ Exposed at lowest 0-10% of the observed tidal range 2 ¿ Exposed at 10-20% of the observed tidal range 3 ¿ Exposed at 20-30% of the observed tidal range 4 ¿ Exposed at 30-40% of the observed tidal range 5 ¿ Exposed at 40-50% of the observed tidal range 6 ¿ Exposed at 50-60% of the observed tidal range 7 ¿ Exposed at 60-70% of the observed tidal range 8 ¿ Exposed at 70-80% of the observed tidal range 9 - Exposed at highest 80-100% of the observed tidal range (land) -999 ¿ No Data

Parent Information

Extents

[-44, -10, 112, 154]

Reference System

Spatial Resolution

25m

Service Information

Associations

Downloads and Links

Download the data (tif)  

Intertidal Extents Model Collection  

Intertidal Extents Model Confidence Layer  

Intertidal Extents Model Coastal Cells shapefile  

Product Description (pdf)  

Source Information

Australian Data Cube ARG25 Surface Reflactance and Pixel Quality Assessment, in conjunction with the OTPS TPX08 Atlas Tidal Model and Normalised Difference Water index (NDWI). 50 112 154 -44 -10