Bu Dijital Yükseklik Modeli (DEM), yaklaşık 82,5°K'nın güneyindeki buz tabakası çevresi ve kenarı (yani denge çizgisi yüksekliğinin altında) için ASTER ve SPOT-5 DEM'lerinin bir kombinasyonundan ve buz tabakası iç kısmında ve en kuzeyde AVHRR fotoklinometrisinden (Scambos ve Haran, 2002) oluşturulmuştur.
SPOT-5 DEM'leri, Spot5 Stereoscopic Survey of Polar Ice: Reference Images & Topographies (SPIRIT) projesi kapsamında üretilip dağıtılmıştır (Korona ve ark., 2009). Okyanus yüzeyleri, GIMP Arazi Sınıflandırması maskesi kullanılarak maskelendi ve CNES CLS11 ortalama deniz yüzeyi yüksekliğiyle (Schaeffer ve diğerleri, 2012).
Not
Tüm arazi yüksekliği verileri, 2003-2009 dönemindeki ortalama ICESat yüksekliklerine göre yatay ve dikey olarak kaydedilir. Bu nedenle, DEM'in nominal tarihi 2007'dir. Ancak DEM'i 70°0N'nin güneyindeki büyük çıkış buzulları gibi hızlı değişim alanlarında kullanırken dikkatli olunmalıdır.
DEM'nin çözünürlüğü 30 m'dir. Bununla birlikte, DEM'nin "gerçek" çözünürlüğü SPOT-5 kapsamındaki alanlarda 40 m (Korona ve diğerleri, 2009) ile fotoklinometri alanlarında 500 m arasında değişir.
ICESat'e göre buz tabakası genelinde doğrulama hatasının karekökü, çoğu buz yüzeyinde +/- 1 m'ye yakın değerlerden yüksek kabartma alanlarında +/- 30 m'ye kadar değişen bir aralıkta +/- 10 m'dir.
Bu verileri kullanmanın koşulu olarak, verilen alıntıyı kullanarak bu veri kümesinin kullanımını alıntılamanız gerekir.
Alıntılar
Alıntılar:
Howat, I.M., C. Negrete, B.E. Smith, 2014, The Greenland Ice
Mapping Project (GIMP) land classification and surface elevation
datasets, The Cryosphere, 8, 1509-1518,
doi:10.5194/tc-8-1509-2014article pdf
Bu dijital yükseklik modeli (DEM), yaklaşık 82,5°K'nın güneyinde buz tabakası çevresi ve kenarı (yani denge çizgisi yüksekliğinin altında) için ASTER ve SPOT-5 DEM'lerinin bir kombinasyonundan ve buz tabakası iç kısmında ve en kuzeyde AVHRR fotoklinometrisinden (Scambos ve Haran, 2002) oluşturulmuştur. SPOT-5 DEM'leri …
[null,null,[],[[["\u003cp\u003eThe OSU/GIMP/DEM dataset provides a Digital Elevation Model (DEM) of Greenland, primarily constructed from ASTER, SPOT-5 DEMs, and AVHRR photoclinometry.\u003c/p\u003e\n"],["\u003cp\u003eThe DEM has a resolution of 30 meters and is registered to average ICESat elevations for the 2003-2009 time period.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset covers Greenland's ice sheet, including its periphery, margin, and interior, with varying resolutions based on data source.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset has a nominal date of 2007, although caution is advised in areas of rapid change, such as major outlet glaciers.\u003c/p\u003e\n"],["\u003cp\u003eUsers must cite the dataset using the provided citations when utilizing the data.\u003c/p\u003e\n"]]],[],null,["# Greenland DEM - Greenland Mapping Project (GIMP)\n\nDataset Availability\n: 1999-06-30T00:00:00Z--2002-09-04T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA NSIDC DAAC at CIRES](https://doi.org/10.5067/NV34YUIXLP9W)\n\nTags\n:\n[arctic](/earth-engine/datasets/tags/arctic) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [gimp](/earth-engine/datasets/tags/gimp) [greenland](/earth-engine/datasets/tags/greenland) [nasa](/earth-engine/datasets/tags/nasa) [polar](/earth-engine/datasets/tags/polar) \n\n#### Description\n\nThis Digital Elevation Model (DEM) is constructed from a combination\nof ASTER and SPOT-5 DEM's for the ice sheet periphery and margin\n(i.e. below the equilbrium line elevation) south of\napproximately 82.5°N and AVHRR photoclinometry in the ice sheet\ninterior and far north (Scambos and Haran, 2002).\n\nSPOT-5 DEM's were produced and distributed as part of the Spot5\nstereoscopic survey of Polar Ice: Reference Images \\& Topographies\n(SPIRIT) project (Korona et al., 2009). Ocean surfaces were masked\nusing the GIMP Land Classification mask and replaced with the\nCNES CLS11 mean sea surface height (Schaeffer et al., 2012).\n\n**Note**\n\n- All land elevation data is horizontally and vertically registered to average ICESat elevations for the 2003-2009 time period, and therefore the DEM has a nominal date of 2007, although care must be taken when using the DEM in areas of rapid change, such as major outlet glaciers south of 70°0N.\n- The DEM has a resolution of 30 m, although the \"true\" resolution of the DEM will vary from 40 m in areas of SPOT-5 coverage (see Korona et al. 2009) to 500 m in areas of photoclinometry.\n- The ice-sheet-wide root-mean-squared validation error relative to ICESat is +/-10 m, rangining from close to +/- 1 m over most ice surfaces to +/- 30 m in areas of high relief.\n\n[General documentation](https://doi.org/10.5067/NV34YUIXLP9W)\n\n### Bands\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|-------------|-------|------------|-------------|\n| `elevation` | m | 30 meters | Elevation |\n\n### Terms of Use\n\n**Terms of Use**\n\nAs a condition of using these data, you must cite the use of this\ndata set using the given citation.\n\n### Citations\n\nCitations:\n\n- Howat, I.M., A. Negrete, B.E. Smith, 2014, The Greenland Ice\n Mapping Project (GIMP) land classification and surface elevation\n datasets, The Cryosphere, 8, 1509-1518,\n [doi:10.5194/tc-8-1509-2014](https://doi.org/10.5194/tc-8-1509-2014)\n [article pdf](https://www.the-cryosphere.net/8/1509/2014/tc-8-1509-2014.pdf)\n\n### DOIs\n\n- \u003chttps://doi.org/10.5067/NV34YUIXLP9W\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 dataset = ee.Image('OSU/GIMP/DEM');\nvar elevation = dataset.select('elevation');\nvar elevationVis = {\n min: 0.0,\n max: 2000.0,\n};\nMap.setCenter(-41.0, 76.0, 4);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/OSU/OSU_GIMP_DEM) \n[Greenland DEM - Greenland Mapping Project (GIMP)](/earth-engine/datasets/catalog/OSU_GIMP_DEM) \nThis Digital Elevation Model (DEM) is constructed from a combination of ASTER and SPOT-5 DEM's for the ice sheet periphery and margin (i.e. below the equilbrium line elevation) south of approximately 82.5°N and AVHRR photoclinometry in the ice sheet interior and far north (Scambos and Haran, 2002). SPOT-5 DEM's were ... \nOSU/GIMP/DEM, arctic,elevation-topography,gimp,greenland,nasa,polar \n1999-06-30T00:00:00Z/2002-09-04T00:00:00Z \n58.795926930232035 -89.32179714240877 83.95392768557056 7.556480769227746 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/NV34YUIXLP9W](https://doi.org/https://doi.org/10.5067/NV34YUIXLP9W)\n- [https://doi.org/10.5067/NV34YUIXLP9W](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/OSU_GIMP_DEM)"]]
