نموذج الارتفاع الرقمي الوطني للمناطق المدية (NIDEM؛ Bishop-Taylor et al. 2018، 2019) هو مجموعة بيانات ارتفاع على مستوى القارة لمنطقة المد والجزر المكشوفة في أستراليا. تقدّم NIDEM أول تمثيل ثلاثي الأبعاد للشواطئ الرملية والمناطق الساحلية الواقعة بين المد والجزر، والمسطحات الطينية، والشواطئ الصخرية، والشعاب المرجانية في أستراليا بدقة مكانية تبلغ 25 مترًا، ما يسدّ فجوة رئيسية بين توفّر بيانات قياس الأعماق تحت المد والجزر وبيانات الارتفاع عن سطح الأرض. تم إنشاء NIDEM من خلال الجمع بين نماذج المد والجزر العالمية وأرشيف السلسلة الزمنية الذي يمتد على 30 عامًا لبيانات الأقمار الصناعية Landsat التي تمت معايرتها مكانيًا وطيفيًا، والتي تتم إدارتها ضمن منصة Digital Earth Australia (DEA).
تكمّل مجموعة بيانات NIDEM منتجات المساحة الحالية بين المد والجزر، وتوفّر بيانات
تتيح مجموعة جديدة من حالات الاستخدام التي تتطلّب فهمًا أكثر تفصيلاً
للتضاريس الثلاثية الأبعاد لمنطقة المد والجزر، مثل
النمذجة الهيدروديناميكية وإدارة المخاطر الساحلية ورسم خرائط
الموائل البيئية.
Bishop-Taylor, R., Sagar, S., Lymburner, L., & Beaman, R. ي. (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
نموذج الارتفاع الرقمي الوطني للمناطق المدية (NIDEM؛ Bishop-Taylor et al. 2018, 2019) هو مجموعة بيانات ارتفاع على مستوى القارة لمنطقة المد والجزر المكشوفة في أستراليا. يوفر نموذج NIDEM أول تمثيل ثلاثي الأبعاد للشواطئ الرملية والساحلية بين المد والجزر في أستراليا، والمسطحات الطينية والشواطئ الصخرية والشعاب المرجانية بدقة مكانية تبلغ 25 مترًا، ما يحل مشكلة رئيسية …
[null,null,[],[[["\u003cp\u003eNIDEM is a continental-scale elevation dataset of Australia's exposed intertidal zone at 25m resolution, created by combining tidal modeling with 30 years of Landsat data.\u003c/p\u003e\n"],["\u003cp\u003eIt provides the first 3D representation of Australia's intertidal areas, including beaches, shores, tidal flats, and reefs.\u003c/p\u003e\n"],["\u003cp\u003eNIDEM fills the data gap between sub-tidal bathymetry and terrestrial elevation data, enabling new applications in coastal risk management, habitat mapping, and hydrodynamic modeling.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from August 16, 1986, to July 31, 2017, and is available under a CC-BY-4.0 license.\u003c/p\u003e\n"]]],[],null,["# Preview National Intertidal Digital Elevation Model 25m 1.0.0\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\nTags\n:\n[australia](/earth-engine/datasets/tags/australia) [dem](/earth-engine/datasets/tags/dem) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [ga](/earth-engine/datasets/tags/ga) \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\n### Bands\n\n\n**Pixel Size**\n\n25 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|---------------------|-------|-----|-----|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `nidem` | m | -5 | 3.9 | meters | 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` | | | | meters | 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 | meters | 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 | meters | 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\n### Explore with Earth Engine\n\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\n### Code Editor (JavaScript)\n\n```javascript\nvar nidem = ee.Image('projects/ngis-cat/assets/DEA/NIDEM');\n\nvar elevation = nidem.select('nidem');\nvar elevationVis = {\n min: -2.5,\n max: 1.5,\n palette: [\n '440154', '471365', '482475', '463480', '414487', '3b528b', '355f8d',\n '2f6c8e', '2a788e', '25848e', '21918c', '1e9c89', '22a884', '2fb47c',\n '44bf70', '5ec962', '7ad151', '9bd93c', 'bddf26', 'dfe318', 'fde725'\n ],\n};\nMap.setCenter(122.36, -18.10, 11);\nMap.addLayer(\n elevation, elevationVis,\n 'National Intertidal Digital Elevation Model (NIDEM; m)');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/ngis-cat/projects_ngis-cat_assets_DEA_NIDEM) \n[Preview National Intertidal Digital Elevation Model 25m 1.0.0](/earth-engine/datasets/catalog/projects_ngis-cat_assets_DEA_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/ngis-cat/assets/DEA/NIDEM, australia,dem,elevation-topography,ga \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_ngis-cat_assets_DEA_NIDEM)"]]
