Bishop-Taylor, R.、Sagar, S.，Lymburner, L.，& Beaman, R. J. (2019)。
Between the tides: Modelling the elevation of Australia's exposed intertidal
zone at continental scale. Estuarine, Coastal and Shelf Science, 223,
115-128.
doi:10.1016/j.ecss.2019.03.006
[null,null,[],[[["\u003cp\u003eNIDEM is a continental-scale elevation dataset of Australia's exposed intertidal zone at 25m resolution, created using Landsat data and tidal modeling.\u003c/p\u003e\n"],["\u003cp\u003eIt provides the first 3D representation of intertidal areas like sandy beaches, tidal flats, and rocky shores, bridging the gap between sub-tidal and terrestrial elevation data.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from 1986 to 2017 and includes elevation, quality flags, and uncertainty measurements.\u003c/p\u003e\n"],["\u003cp\u003eNIDEM supports applications in hydrodynamic modeling, coastal risk management, and habitat mapping.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is part of the Digital Earth Australia Program and is available under a CC-BY-4.0 license.\u003c/p\u003e\n"]]],["The NIDEM dataset, managed by Geoscience Australia, provides a 25m spatial resolution, three-dimensional elevation model of Australia's intertidal zone, derived from Landsat data from 1986-08-16 to 2017-07-31. It includes elevation, uncertainty, quality flags, and uncleaned elevation bands. Access is via Earth Engine, and the dataset will be removed on March 1, 2025. Users can explore it using the provided Earth Engine snippet and are directed to the documentation for further information.\n"],null,["# National Intertidal Digital Elevation Model 25m 1.0.0 [deprecated]\n\n**Caution:** This dataset was removed on March 01, 2025. [Learn more.](https://developers.google.com/earth-engine/datasets/reference/removed_datasets#geoscience_australia_publisher_catalog) \ninfo\n\n\nThis dataset is part of a Publisher Catalog, and not managed by Google Earth Engine.\n\nContact [Geoscience Australia](https://www.ga.gov.au/contact-us)\n\nfor bugs or [view more datasets](https://developers.google.com/earth-engine/datasets/publisher/geoscience-aus-cat)\nfrom the Geoscience Australia Catalog. [Learn more about Publisher datasets](/earth-engine/datasets/publisher). \n[](https://www.ga.gov.au/) \n\nCatalog Owner\n: Geoscience Australia\n\nDataset Availability\n: 1986-08-16T00:00:00Z--2017-07-31T23:59:59Z\n\nDataset Provider\n:\n\n\n [Geoscience Australia](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat)\n\n\n [NGIS](https://ngis.com.au/)\n\nContact\n: [Geoscience Australia](https://www.ga.gov.au/contact-us)\n\nTags\n:\n[australia](/earth-engine/datasets/tags/australia) [dem](/earth-engine/datasets/tags/dem) [ga](/earth-engine/datasets/tags/ga) [geoscience-aus-cat](/earth-engine/datasets/tags/geoscience-aus-cat) [landsat-derived](/earth-engine/datasets/tags/landsat-derived) [publisher-dataset](/earth-engine/datasets/tags/publisher-dataset) \n\n#### Description\n\nThe National Intertidal Digital Elevation Model (NIDEM; Bishop-Taylor et\nal. 2018, 2019) is a continental-scale elevation dataset for Australia's\nexposed intertidal zone. NIDEM provides the first three-dimensional\nrepresentation of Australia's intertidal sandy beaches and shores, tidal\nflats and rocky shores and reefs at 25 m spatial resolution, addressing a\nkey gap between the availability of sub-tidal bathymetry and terrestrial\nelevation data. NIDEM was generated by combining global tidal modelling with\na 30-year time series archive of spatially and spectrally calibrated Landsat\nsatellite data managed within the Digital Earth Australia (DEA) platform.\nNIDEM complements existing intertidal extent products, and provides data to\nsupport a new suite of use cases that require a more detailed understanding\nof the three-dimensional topography of the intertidal zone, such as\nhydrodynamic modelling, coastal risk management and ecological habitat\nmapping.\n\nFor more information, please see the\n[DEA Intertidal Elevation](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat#basics)\n\nThis product is part of the [Digital Earth Australia Program](https://www.dea.ga.gov.au/)\n\n### Bands\n\n\n**Pixel Size**\n\n25 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Description |\n|---------------------|-------|-----|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `nidem` | m | -5 | 3.9 | Primary product: elevation in meter units relative to modelled Mean Sea Level (MSL). [Band details](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat#details) |\n| `nidem_mask` | | | | Quality flag. [Band details](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat#details) |\n| `nidem_uncertainty` | m | 0 | 0.3 | Uncertainty meters. [Band details](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat#details) |\n| `nidem_unfiltered` | m | -5 | 3.9 | Un-cleaned elevation in meters. [Band details](https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat#details) |\n\n**nidem_mask Class Table**\n\n| Value | Color | Description |\n|-------|---------|----------------------------------------------|\n| 1 | #00ff00 | above 25 m relative to Mean Sea Level (MSL) |\n| 2 | #ff0000 | below -25 m relative to Mean Sea Level (MSL) |\n| 3 | #ffff00 | invalid elevation estimates |\n\n### Terms of Use\n\n**Terms of Use**\n\n[CC-BY-4.0](https://spdx.org/licenses/CC-BY-4.0.html)\n\n### Citations\n\nCitations:\n\n- Bishop-Taylor, R., Sagar, S., Lymburner, L., \\& Beaman, R. J. (2019).\n Between the tides: Modelling the elevation of Australia's exposed intertidal\n zone at continental scale. Estuarine, Coastal and Shelf Science, 223,\n 115-128.\n [doi:10.1016/j.ecss.2019.03.006](https://doi.org/10.1016/j.ecss.2019.03.006)\n\n### DOIs\n\n- \u003chttps://doi.org/10.1016/j.ecss.2019.03.006\u003e\n**Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) \n[National Intertidal Digital Elevation Model 25m 1.0.0 \\[deprecated\\]](/earth-engine/datasets/catalog/projects_geoscience-aus-cat_assets_NIDEM) \nThe National Intertidal Digital Elevation Model (NIDEM; Bishop-Taylor et al. 2018, 2019) is a continental-scale elevation dataset for Australia's exposed intertidal zone. NIDEM provides the first three-dimensional representation of Australia's intertidal sandy beaches and shores, tidal flats and rocky shores and reefs at 25 m spatial resolution, addressing a key ... \nprojects/geoscience-aus-cat/assets/NIDEM, australia,dem,ga,geoscience-aus-cat,landsat-derived,publisher-dataset \n1986-08-16T00:00:00Z/2017-07-31T23:59:59Z \n-44.41 108.81 -9.13 157.82 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.1016/j.ecss.2019.03.006](https://doi.org/https://cmi.ga.gov.au/data-products/dea/325/dea-intertidal-elevation-landsat)\n- [https://doi.org/10.1016/j.ecss.2019.03.006](https://doi.org/https://ngis.com.au/)\n- [https://doi.org/10.1016/j.ecss.2019.03.006](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/projects_geoscience-aus-cat_assets_NIDEM)"]]
