Bu veri kümesi, Temmuz 2010 ile Temmuz 2016 arasında CryoSat-2 uydusu radar altimetresi tarafından kaydedilen gözlemlere dayalı olarak Antarktika buz tabakasının ve buz sahanlıklarının dijital yükseklik modelidir (DEM).
DEM, 1, 2 ve 5 km'lik ızgara hücrelerinde toplanan yükseklik ölçümlerine yapılan uzamsal-zamansal uyumlarla oluşturulur ve 1 km'lik modal çözünürlükte yayınlanır. DEM ile NASA Operation IceBridge kampanyaları sırasında elde edilen 2,3*107; havadan lazer altimetre ölçümleri arasındaki medyan ve karekök ortalama farkı sırasıyla -0,30 ve 13,50 m'dir.
DEM belirsizliği, özellikle yükseklik ölçümlerinin düşük çözünürlüklü modda alındığı yüksek eğimli bölgelerde artar.Bunu göz önünde bulundurarak ortalama doğruluğun 9, 5 m olduğunu tahmin ediyoruz.
Bantlar
Piksel Boyutu 1.000 metre
Bantlar
Ad
Birimler
Piksel Boyutu
Açıklama
elevation
dk.
metre
Antarktika buz tabakası ve buz sahanlığı yüksekliği.
data_composition
metre
Yükseklik için ızgara hücresi başına veri işleme yöntemi.
slope
drc
metre
Eğim, yükseklik gradyanından elde edilir.
z_smoothed
dk.
metre
Medyan filtresi kullanılarak düzeltilmiş yükseklik modeli sürümü.
z_uncertainty
dk.
metre
Gözlemlenen ızgara hücrelerindeki yükseklik artıklarının RMS'si ve enterpolasyon yapılan ızgara hücrelerindeki kriging varyans hatasından elde edilen yükseklik modelinin kesinliği.
Slater, T., Shepherd, A., McMillan, M., Muir, A., Gilbert, L.,
Hogg, A. E., Konrad, H. ve Parrinello, T.: A new Digital Elevation
Model of Antarctica derived from CryoSat-2 altimetry, The Cryosphere,
doi:10.5194/tc-2017-223, 2018
Bu veri kümesi, Temmuz 2010 ile Temmuz 2016 arasında CryoSat-2 uydu radar altimetresi tarafından kaydedilen gözlemlere dayalı olarak Antarktika buz tabakasının ve buz sahanlıklarının dijital yükseklik modelidir (DEM). DEM, 1, 2 ve 5 km'lik ızgara içinde toplanan yükseklik ölçümlerine yapılan uzamsal-zamansal uyumlarla oluşturulur.
[null,null,[],[[["\u003cp\u003eThis dataset provides a 1 km resolution digital elevation model (DEM) of the Antarctic ice sheet and ice shelves.\u003c/p\u003e\n"],["\u003cp\u003eThe DEM is derived from CryoSat-2 satellite radar altimetry data collected between July 2010 and July 2016.\u003c/p\u003e\n"],["\u003cp\u003eIt includes elevation, data composition, slope, a smoothed elevation model, and elevation uncertainty bands.\u003c/p\u003e\n"],["\u003cp\u003eThe DEM has an average accuracy of 9.5m and was validated against NASA Operation IceBridge airborne laser altimeter measurements.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is provided by CPOM and has specific terms of use.\u003c/p\u003e\n"]]],["The dataset provides a digital elevation model (DEM) of the Antarctic ice sheet and shelves, derived from CryoSat-2 satellite radar altimeter observations between July 2010 and July 2016. Elevation measurements were fitted within 1, 2, and 5 km grid cells, with a 1 km modal resolution. The data includes elevation, data composition, slope, a smoothed elevation version, and elevation uncertainty. Users can access the dataset through Earth Engine using a provided code snippet. The average accuracy is estimated to be 9.5m.\n"],null,["# CryoSat-2 Antarctica 1km DEM\n\nDataset Availability\n: 2010-07-01T00:00:00Z--2016-07-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [CPOM](http://www.cpom.ucl.ac.uk/csopr/icesheets2/dems.php?ais_subject=dem&user_type=normal)\n\nTags\n:\n [antarctica](/earth-engine/datasets/tags/antarctica) [dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [elevation-topography](/earth-engine/datasets/tags/elevation-topography) [polar](/earth-engine/datasets/tags/polar) \n cpom \ncryosat-2 \n\n#### Description\n\nThis dataset is a digital elevation model (DEM) of the\nAntarctic ice sheet and ice shelves based on\nobservations recorded by the CryoSat-2 satellite\nradar altimeter between July 2010 and July 2016.\n\nThe DEM is formed from spatio-temporal fits to elevation\nmeasurements accumulated within 1, 2, and 5 km grid cells,\nand is posted at the modal resolution of 1 km. The median\nand root mean square difference between the DEM and 2.3\\*10^7^;\nairborne laser altimeter measurements acquired during\nNASA Operation IceBridge campaigns are -0.30 and 13.50 m,\nrespectively.\n\nThe DEM uncertainty rises in regions of high slope,\nespecially where elevation measurements were acquired in\nlow-resolution mode; taking this into account, we estimate\nthe average accuracy to be 9.5 m.\n\n### Bands\n\n\n**Pixel Size**\n\n1000 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|--------------------|-------|------------|--------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `elevation` | m | meters | Antarctic ice sheet and ice shelf elevation. |\n| `data_composition` | | meters | Data processing method of elevation per grid cell. |\n| `slope` | deg | meters | Slope derived from elevation gradient. |\n| `z_smoothed` | m | meters | Smoothed version of elevation model using a median filter. |\n| `z_uncertainty` | m | meters | Certainty of elevation model derived from RMS of elevation residuals in observed grid cells and the kriging variance error in interpolated grid cells. |\n\n**data_composition Class Table**\n\n| Value | Color | Description |\n|-------|---------|--------------------|\n| 0 | #000000 | interpolated |\n| 1 | #cbcbcb | 1 km fit |\n| 2 | #377eb7 | resampled 2 km fit |\n| 3 | #e2191b | resampled 5 km fit |\n\n### Terms of Use\n\n**Terms of Use**\n\n[proprietary](/earth-engine/datasets/catalog/Use%20a%20custom%20URL%20for%20the%20non-standard%20license)\n\n### Citations\n\nCitations:\n\n- Slater, T., Shepherd, A., McMillan, M., Muir, A., Gilbert, L.,\n Hogg, A. E., Konrad, H. and Parrinello, T.: A new Digital Elevation\n Model of Antarctica derived from CryoSat-2 altimetry, The Cryosphere,\n [doi:10.5194/tc-2017-223](https://doi.org/10.5194/tc-2017-223), 2018\n\n### DOIs\n\n- \u003chttps://doi.org/10.5194/tc-2017-223\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('CPOM/CryoSat2/ANTARCTICA_DEM');\n\nvar visualization = {\n bands: ['elevation'],\n min: 0.0,\n max: 4000.0,\n palette: ['001fff', '00ffff', 'fbff00', 'ff0000']\n};\n\nMap.setCenter(17.0, -76.0, 3);\n\nMap.addLayer(dataset, visualization, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/CPOM/CPOM_CryoSat2_ANTARCTICA_DEM) \n[CryoSat-2 Antarctica 1km DEM](/earth-engine/datasets/catalog/CPOM_CryoSat2_ANTARCTICA_DEM) \nThis dataset is a digital elevation model (DEM) of the Antarctic ice sheet and ice shelves based on observations recorded by the CryoSat-2 satellite radar altimeter between July 2010 and July 2016. The DEM is formed from spatio-temporal fits to elevation measurements accumulated within 1, 2, and 5 km grid ... \nCPOM/CryoSat2/ANTARCTICA_DEM, antarctica,dem,elevation,elevation-topography,polar \n2010-07-01T00:00:00Z/2016-07-01T00:00:00Z \n-88 -180 -60 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5194/tc-2017-223](https://doi.org/http://www.cpom.ucl.ac.uk/csopr/icesheets2/dems.php?ais_subject=dem&user_type=normal)\n- [https://doi.org/10.5194/tc-2017-223](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/CPOM_CryoSat2_ANTARCTICA_DEM)"]]
