Cet ensemble de données est un modèle numérique d'élévation (MNE) de la calotte glaciaire et des plates-formes de glace de l'Antarctique, basé sur les observations enregistrées par l'altimètre radar du satellite CryoSat-2 entre juillet 2010 et juillet 2016.
Le MNE est formé à partir d'ajustements spatio-temporels aux mesures d'altitude accumulées dans des cellules de grille de 1, 2 et 5 km, et est publié à la résolution modale de 1 km. La différence médiane et la différence quadratique moyenne entre le MNE et 2,3*107 ; les mesures d'altimètre laser aéroporté acquises lors des campagnes NASA Operation IceBridge sont respectivement de -0,30 et 13,50 m.
L'incertitude du MNE augmente dans les régions à forte pente, en particulier lorsque les mesures d'altitude ont été acquises en mode basse résolution.En tenant compte de cela, nous estimons que la précision moyenne est de 9,5 m.
Bracelets
Taille des pixels 1 000 mètres
Bandes de fréquences
Nom
Unités
Taille des pixels
Description
elevation
m
mètres
Élévation de la calotte glaciaire et de la plate-forme de glace de l'Antarctique.
data_composition
mètres
Méthode de traitement des données d'altitude par cellule de grille.
slope
deg
mètres
Pente dérivée du gradient d'altitude.
z_smoothed
m
mètres
Version lissée du modèle d'altitude à l'aide d'un filtre médian.
z_uncertainty
m
mètres
Certitude du modèle d'altitude dérivée de la racine carrée moyenne des résidus d'altitude dans les cellules de grille observées et de l'erreur de variance de krigeage dans les cellules de grille interpolées.
Slater, T., Shepherd, A., McMillan, M., Muir, A., Gilbert, L.,
Hogg, A. E., Konrad, H. et Parrinello, T.: A new Digital Elevation
Model of Antarctica derived from CryoSat-2 altimetry, The Cryosphere,
doi:10.5194/tc-2017-223, 2018
Cet ensemble de données est un modèle numérique d'élévation (MNE) de la calotte glaciaire et des plates-formes de glace de l'Antarctique, basé sur des observations enregistrées par l'altimètre radar du satellite CryoSat-2 entre juillet 2010 et juillet 2016. Le MNE est formé à partir d'ajustements spatio-temporels aux mesures d'altitude accumulées dans une grille de 1, 2 et 5 km…
[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)"]]
