Este conjunto de datos es un modelo digital de elevación (MDE) de la capa de hielo y las plataformas de hielo de la Antártida basado en las observaciones registradas por el altímetro de radar del satélite CryoSat-2 entre julio de 2010 y julio de 2016.
El MDT se forma a partir de ajustes espacio-temporales de las mediciones de elevación acumuladas en celdas de cuadrícula de 1, 2 y 5 km, y se publica con una resolución modal de 1 km. La diferencia de la mediana y la raíz cuadrada de la media entre el MDT y las mediciones del altímetro láser aerotransportado adquiridas durante las campañas de la Operación IceBridge de la NASA son de -0.30 y 13.50 m, respectivamente.
La incertidumbre del MDT aumenta en las regiones con pendientes pronunciadas, en especial, en las que las mediciones de elevación se adquirieron en modo de baja resolución. Teniendo esto en cuenta, estimamos que la precisión promedio es de 9.5 m.
Bandas
Tamaño del píxel 1,000 metros
Bandas
Nombre
Unidades
Tamaño de los píxeles
Descripción
elevation
m
metros
Elevación de la cubierta de hielo y la plataforma de hielo de la Antártida.
data_composition
metros
Es el método de procesamiento de datos de elevación por celda de cuadrícula.
slope
º
metros
Pendiente derivada del gradiente de elevación.
z_smoothed
m
metros
Versión suavizada del modelo de elevación con un filtro de mediana.
z_uncertainty
m
metros
Certidumbre del modelo de elevación derivado de la raíz cuadrada media de los residuos de elevación en las celdas de la cuadrícula observadas y el error de varianza de kriging en las celdas de la cuadrícula interpoladas.
Slater, T., Shepherd, A., McMillan, M., Muir, A., Gilbert, L.,
Hogg, A. E., Konrad, H. y Parrinello, T.: Un nuevo modelo digital de elevación de la Antártida derivado de la altimetría de CryoSat-2, The Cryosphere, doi:10.5194/tc-2017-223, 2018
Este conjunto de datos es un modelo digital de elevación (MDE) de la capa de hielo y las plataformas de hielo de la Antártida basado en las observaciones registradas por el altímetro de radar del satélite CryoSat-2 entre julio de 2010 y julio de 2016. El MDT se forma a partir de ajustes espacio-temporales de las mediciones de elevación acumuladas en una cuadrícula de 1, 2 y 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)"]]
