d2767fc0-08cb-4f86-a7e2-55e04735362e urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T17:39:46 creation ISO 19115 2016 Intertidal Extents Model Coastal Cells shapefile d2767fc0-08cb-4f86-a7e2-55e04735362e 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 Intertidal Extents Model (ITEM v1.0) consists of three datasets derived from the Landsat NBAR data managed in the Australian Geoscience Data Cube (AGDC) for the period 1987 to 2015. The Coastal Cells shapefile (ITEM_CoastalCells.shp) identifies the location and extents of the 221 one degree by one degree AGDC cells used in the product, covering the mainland and Tasmanian coastline of the continent (Figure 1). The shapefile also includes information on the lowest (LOT) and highest (HOT) observed tides for the cell, and hence the observed tidal range (HOT-LOT), based on tidal modelling for the time of acquisition of each of the corresponding Landsat tile observations in the cell. Attributes: AGDC Cell Identifier Lowest Observed Tide (LOT) - The lowest modelled tidal offset based on the acquisition times of all observations in the cell. Relative to Mean Sea Level (MSL) (m) x 1000. Highest Observed Tide (HOT) - The highest modelled tidal offset based on the acquisition times of all observations in the cell. Relative to Mean Sea Level (MSL) (m) x 1000. {"type": "Polygon", "coordinates": [[[112.0, -44.0], [154.0, -44.0], [154.0, -10.0], [112.0, -10.0], [112.0, -44.0]]]} 112.0 154.0 -44.0 -10.0 EARTH SCIENCES Earth Science | Oceans Earth Science | Oceans | Tides Earth Science | Terrestrial Hydrosphere Intertidal Extents Model NCI Published_External Download the data (shp) documentDigital Download the data (shp) ZIP Intertidal Extents Model Collection documentDigital Intertidal Extents Model Collection HTML Intertidal Extents Model Confidence Layer documentDigital Intertidal Extents Model Confidence Layer HTML Intertidal Extents Model Relative Extents Model documentDigital Intertidal Extents Model Relative Extents Model HTML Product Description (pdf) documentDigital Product Description (pdf) PDF