تم استخلاص "نموذج الارتفاع الرقمي" (DEM-H) الذي تم تعديله هيدرولوجيًا من بيانات SRTM التي حصلت عليها وكالة ناسا في فبراير 2000. تمت تهيئة النموذج هيدرولوجيًا وتم فرض الصرف. تتضمّن بيانات DEM-H مسارات التدفق استنادًا إلى الارتفاعات التي توفّرها بيانات SRTM
وخطوط الجداول المحدّدة على الخريطة، كما تتيح تحديد مستجمعات المياه
والسمات الهيدرولوجية ذات الصلة. تم استخلاص مجموعة البيانات من
نموذج الارتفاع الرقمي (DEM-S) الذي تم تنعيمه لمدة ثانية واحدة (ANZCW0703014016)
من خلال فرض الاتصال الهيدرولوجي باستخدام برنامج ANUDEM،
باستخدام خطوط مجرى مائي محددة من AusHydro الإصدار 1.6 (فبراير 2010) بمقياس 1:250,000
(ANZCW0503900101) وخطوط مستمدة من DEM-S لتحديد
المجاري المائية. أدّى فرض استخدام بيانات الصرف إلى الحصول على تمثيل متسق للاتصال الهيدرولوجي مع بعض التشوهات الناتجة عن فرض استخدام بيانات الصرف. يتم حاليًا إعداد وصف كامل للطرق (Dowling et al., in prep).
يوفّر هذا المنتج نموذج ارتفاع رقمي مناسبًا للاستخدام في التحليل الهيدرولوجي، مثل تحديد مستجمعات المياه وتوجيه التدفق.
هناك عدّة مناطق تتضمّن قيمًا سالبة غير متوقّعة: بالقرب من كانبيرا حول (150.443044، -35.355281) بقيم تبلغ -55، وفي غرب أستراليا حول (124.84، -16.44) بقيم تبلغ -43.
تم استخلاص "نموذج الارتفاع الرقمي" (DEM-H) الذي يراعي الخصائص الهيدرولوجية من بيانات "مهمة طوبوغرافيا المكوك" (SRTM) التي حصلت عليها وكالة "ناسا" في فبراير 2000. تمت تهيئة النموذج هيدرولوجيًا وتم فرض الصرف. تحدّد DEM-H مسارات التدفق استنادًا إلى ارتفاعات SRTM وخطوط الجداول المحدّدة على الخريطة، وتتيح تحديد مستجمعات المياه والسمات الهيدرولوجية ذات الصلة. …
[null,null,[],[[["\u003cp\u003eThe Hydrologically Enforced Digital Elevation Model (DEM-H) of Australia was derived from NASA's SRTM data and has been hydrologically conditioned for drainage enforcement.\u003c/p\u003e\n"],["\u003cp\u003eDEM-H supports hydrological analysis, such as catchment definition and flow routing, by capturing flow paths based on SRTM elevations and mapped stream lines.\u003c/p\u003e\n"],["\u003cp\u003eThis DEM, with a resolution of 30.92 meters, covers Australia and has a Creative Commons Attribution 4.0 license.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset was produced by Geoscience Australia and is available in Earth Engine with an elevation band ranging from approximately -31 to 2223 meters.\u003c/p\u003e\n"]]],[],null,["# DEM-H: Australian SRTM Hydrologically Enforced Digital Elevation Model\n\nDataset Availability\n: 2010-02-01T00:00:00Z--2010-02-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [Geoscience Australia](https://www.ga.gov.au/metadata-gateway/metadata/record/72759/)\n\nTags\n:\n[australia](/earth-engine/datasets/tags/australia) [dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [ga](/earth-engine/datasets/tags/ga) [geophysical](/earth-engine/datasets/tags/geophysical) [geoscience-australia](/earth-engine/datasets/tags/geoscience-australia) [smoothed](/earth-engine/datasets/tags/smoothed) [srtm](/earth-engine/datasets/tags/srtm) \n\n#### Description\n\nThe Hydrologically Enforced Digital Elevation Model\n(DEM-H) was derived from the SRTM data acquired by NASA in February\n2000. The model has been hydrologically conditioned and drainage\nenforced. The DEM-H captures flow paths based on SRTM elevations\nand mapped stream lines, and supports delineation of catchments\nand related hydrological attributes. The dataset was derived from\nthe 1 second smoothed Digital Elevation Model (DEM-S; ANZCW0703014016)\nby enforcing hydrological connectivity with the ANUDEM software,\nusing selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse\nlines (ANZCW0503900101) and lines derived from DEM-S to define\nthe watercourses. The drainage enforcement has produced a consistent\nrepresentation of hydrological connectivity with some elevation\nartifacts resulting from the drainage enforcement. A full description\nof the methods is in preparation (Dowling et al., in prep).\n\nThis product provides a DEM suitable for use in hydrological analysis\nsuch as catchment definition and flow routing.\n\nThere are several areas with unexpected negative values: close to\nCanberra around (150.443044, -35.355281) with values of -55 and in Western\nAustralia around (124.84, -16.44) with -43.\n\n### Bands\n\n\n**Pixel Size**\n\n30.92 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|-------------|-------|----------|-----------|------------|-------------|\n| `elevation` | m | -31.37\\* | 2223.24\\* | meters | Elevation |\n\n\\* estimated min or max value\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- Geoscience Australia, 2015. Digital Elevation Model (DEM) of Australia\n derived from LiDAR 5 Metre Grid. Geoscience Australia, Canberra.\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 dataset = ee.Image('AU/GA/DEM_1SEC/v10/DEM-H');\nvar elevation = dataset.select('elevation');\nvar elevationVis = {\n min: -10.0,\n max: 1300.0,\n palette: [\n '3ae237', 'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13',\n 'ff6e08', 'ff500d', 'ff0000', 'de0101', 'c21301', '0602ff', '235cb1',\n '307ef3', '269db1', '30c8e2', '32d3ef', '3be285', '3ff38f', '86e26f'\n ],\n};\nMap.setCenter(133.95, -24.69, 5);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/AU/AU_GA_DEM_1SEC_v10_DEM-H) \n[DEM-H: Australian SRTM Hydrologically Enforced Digital Elevation Model](/earth-engine/datasets/catalog/AU_GA_DEM_1SEC_v10_DEM-H) \nThe Hydrologically Enforced Digital Elevation Model (DEM-H) was derived from the SRTM data acquired by NASA in February 2000. The model has been hydrologically conditioned and drainage enforced. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. ... \nAU/GA/DEM_1SEC/v10/DEM-H, australia,dem,elevation,elevation-topography,ga,geophysical,geoscience-australia,smoothed,srtm \n2010-02-01T00:00:00Z/2010-02-01T00:00:00Z \n-44.06 112.99 -9.99 154 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.ga.gov.au/metadata-gateway/metadata/record/72759/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/AU_GA_DEM_1SEC_v10_DEM-H)"]]
