Preview National Intertidal Digital Elevation Model 25m 1.0.0

Dataset Availability
Dataset Provider
Earth Engine Snippet
australia dem ga


The 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 gap between the availability of sub-tidal bathymetry and terrestrial elevation data. NIDEM was generated by combining global tidal modelling with a 30-year time series archive of spatially and spectrally calibrated Landsat satellite data managed within the Digital Earth Australia (DEA) platform. NIDEM complements existing intertidal extent products, and provides data to support a new suite of use cases that require a more detailed understanding of the three-dimensional topography of the intertidal zone, such as hydrodynamic modelling, coastal risk management and ecological habitat mapping.

For more information, please see the DEA Intertidal Elevation


25 meters


Name Units Min Max Description
nidem m -5 3.9

Primary product: elevation in meter units relative to modelled Mean Sea Level (MSL). Band details


Quality flag. Band details

nidem_uncertainty m 0 0.3

Uncertainty meters. Band details

nidem_unfiltered m -5 3.9

Un-cleaned elevation in meters. Band details

nidem_mask Class Table

Value Color Description
1 #00ff00 above 25 m relative to Mean Sea Level (MSL)
2 #ff0000 below -25 m relative to Mean Sea Level (MSL)
3 #ffff00 invalid elevation estimates

Terms of Use

Terms of Use



  • 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


Explore with Earth Engine

Code Editor (JavaScript)

var nidem = ee.Image('projects/ngis-cat/assets/DEA/NIDEM');

var elevation ='nidem');
var elevationVis = {
  min: -2.5,
  max: 1.5,
  palette: [
    '440154', '471365', '482475', '463480', '414487', '3b528b', '355f8d',
    '2f6c8e', '2a788e', '25848e', '21918c', '1e9c89', '22a884', '2fb47c',
    '44bf70', '5ec962', '7ad151', '9bd93c', 'bddf26', 'dfe318', 'fde725'
Map.setCenter(122.36, -18.10, 11);
    elevation, elevationVis,
    'National Intertidal Digital Elevation Model (NIDEM; m)');
Open in Code Editor