El mosaico de imágenes de Landsat de la Antártida (LIMA) es un mosaico continuo y prácticamente sin nubes creado a partir de escenas procesadas de Landsat 7 ETM+.
Las escenas de Landsat procesadas (16 bits) son escenas de NLAPS de nivel 1Gt convertidas a 16 bits, procesadas con corrección del ángulo solar y convertidas a valores de reflectancia (Bindschadler, 2008).
Cada escena de Landsat se procesa con datos de elevación y corrección del ángulo del sol para garantizar que las características de la superficie se representen con precisión. El ángulo del sol en la Antártida da la apariencia de un sol poniente. Debido al ángulo bajo del sol, a medida que Landsat pasa sobre la Antártida, los bordes exteriores del continente se ven más brillantes que las áreas más cercanas al Polo Sur, por lo que las escenas tienen áreas brillantes y oscuras.
Se corrigieron los ángulos y las sombras del sol inconsistentes en estas escenas. Sin este proceso, el mosaico produciría un parche de escenas, ya que cada escena tendría un lado más brillante y otro más oscuro.
Los usuarios pueden encontrar los metadatos de imágenes individuales disponibles como una tabla en:
USGS/LIMA/SR_METADATA
Bandas
Bandas
Nombre
Tamaño de los píxeles
Longitud de onda
Descripción
B1
30 metros
0.45 a 0.52 μm
Azul
B2
30 metros
0.52 a 0.60 μm
Verde
B3
30 metros
0.63 a 0.69 μm
Rojo
B4
30 metros
0.77 a 0.90 μm
Infrarrojo cercano
B5
30 metros
1.55 a 1.75 μm
Infrarrojo de onda corta 1
B7
30 metros
2.08 a 2.35 μm
Infrarrojo de onda corta 2
B8
15 metros
0.52 a 0.90 μm
Panchromatic
Condiciones de Uso
Condiciones de Uso
Estas imágenes son de dominio público y se pueden usar libremente y sin reconocimiento. Sin embargo, se agradece mucho que se mencione el proyecto Landsat Image Mosaic of Antarctica (LIMA).
Citas
Citas:
Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J.,
Binnie, D., Paulson, S., Granneman, B., and Gorodetzky, D., 2008, The Landsat Image Mosaic of Antarctica, Remote Sensing of Environment, 112, págs. 4214-4226.
PDF
El mosaico de imágenes de Landsat de la Antártida (LIMA) es un mosaico continuo y prácticamente sin nubes creado a partir de escenas procesadas de Landsat 7 ETM+. Las escenas de Landsat procesadas (16 bits) son escenas de NLAPS de nivel 1Gt convertidas a 16 bits, procesadas con corrección del ángulo solar y convertidas a valores de reflectancia (Bindschadler, 2008). Cada escena de Landsat es…
[null,null,[],[[["\u003cp\u003eLIMA provides a seamless, nearly cloud-free mosaic of Antarctica derived from Landsat 7 ETM+ scenes between 1999 and 2002.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes surface reflectance values, with sun-angle correction applied for consistent illumination across the mosaic.\u003c/p\u003e\n"],["\u003cp\u003eIt offers various spectral bands, including Blue, Green, Red, Near Infrared, and Shortwave Infrared, at 30-meter resolution (15-meter for Panchromatic).\u003c/p\u003e\n"],["\u003cp\u003eLIMA data is publicly available and can be used freely with attribution encouraged.\u003c/p\u003e\n"],["\u003cp\u003eThe USGS provides individual scene metadata as a separate table for more detailed information.\u003c/p\u003e\n"]]],["The Landsat Image Mosaic of Antarctica (LIMA), provided by USGS, is a cloudless mosaic from processed Landsat 7 ETM+ scenes between 1999 and 2002. These scenes underwent sun-angle correction and conversion to reflectance values. Data is available in various bands, including Blue, Green, Red, and Near Infrared, with pixel sizes of 15-30 meters. Individual image metadata is available. These public domain images are freely usable, accessible via Google Earth Engine.\n"],null,["# Landsat Image Mosaic of Antarctica (LIMA) - Processed Landsat Scenes (16 bit)\n\nDataset Availability\n: 1999-06-30T00:00:00Z--2002-09-04T00:00:00Z\n\nDataset Provider\n:\n\n\n [USGS](https://lima.usgs.gov/index.php)\n\nTags\n:\n[antarctica](/earth-engine/datasets/tags/antarctica) [ice](/earth-engine/datasets/tags/ice) [landsat-derived](/earth-engine/datasets/tags/landsat-derived) [lima](/earth-engine/datasets/tags/lima) [mosaic](/earth-engine/datasets/tags/mosaic) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [sr](/earth-engine/datasets/tags/sr) [usgs](/earth-engine/datasets/tags/usgs) \n\n#### Description\n\nThe Landsat Image Mosaic of Antarctica (LIMA) is a seamless\nand virtually cloudless mosaic created from processed\nLandsat 7 ETM+ scenes.\n\nProcessed Landsat Scenes (16 bit) are Level 1Gt NLAPS\nscenes converted to 16 bit, processed with sun-angle\ncorrection, and converted to reflectance values\n([Bindschadler 2008](https://lima.usgs.gov/LIMA_paper.pdf)).\n\nEach Landsat scene is processed with elevation\ndata and sun-angle correction to ensure surface features\nwere accurately represented. The sun's angle in Antarctica\ngives the appearance of a setting sun. Because of the low\nsun angle, as Landsat passes over Antarctica, the outer\nedges of the continent appear brighter than areas closer\nto the South Pole, so scenes have bright and dark areas.\nInconsistent sun angles and shadows where corrected for\nthese scenes. Without this process, mosaicking would produce\na patchwork of scenes since each scene would have a brighter\nand a darker side.\n\nUsers can find individual image metadata available as a table at:\n[USGS/LIMA/SR_METADATA](/earth-engine/datasets/catalog/USGS_LIMA_SR_METADATA)\n\n### Bands\n\n**Bands**\n\n| Name | Pixel Size | Wavelength | Description |\n|------|------------|----------------|----------------------|\n| `B1` | 30 meters | 0.45 - 0.52 μm | Blue |\n| `B2` | 30 meters | 0.52 - 0.60 μm | Green |\n| `B3` | 30 meters | 0.63 - 0.69 μm | Red |\n| `B4` | 30 meters | 0.77 - 0.90 μm | Near infrared |\n| `B5` | 30 meters | 1.55 - 1.75 μm | Shortwave infrared 1 |\n| `B7` | 30 meters | 2.08 - 2.35 μm | Shortwave infrared 2 |\n| `B8` | 15 meters | 0.52 - 0.90 μm | Panchromatic |\n\n### Terms of Use\n\n**Terms of Use**\n\nThese images are in the public domain and can be used freely\nand without acknowledgement. However, credit to the Landsat\nImage Mosaic of Antarctica (LIMA) Project is greatly appreciated.\n\n### Citations\n\nCitations:\n\n- Bindschadler, R., Vornberger, P., Fleming, A., Fox, A., Mullins, J.,\n Binnie, D., Paulson, S., Granneman, B., and Gorodetzky, D., 2008,\n The Landsat Image Mosaic of Antarctica, Remote Sensing of\n Environment, 112, pp. 4214-4226.\n [PDF](https://lima.usgs.gov/LIMA_paper.pdf)\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.ImageCollection('USGS/LIMA/SR');\nvar antarctica = dataset.select(['B3', 'B2', 'B1']);\nvar antarcticaVis = {\n min: 0.0,\n max: 10000.0,\n};\nMap.setCenter(164.619, -77.99, 7);\nMap.addLayer(antarctica, antarcticaVis, 'Antartica Imagery (RGB)');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/USGS/USGS_LIMA_SR) \n[Landsat Image Mosaic of Antarctica (LIMA) - Processed Landsat Scenes (16 bit)](/earth-engine/datasets/catalog/USGS_LIMA_SR) \nThe Landsat Image Mosaic of Antarctica (LIMA) is a seamless and virtually cloudless mosaic created from processed Landsat 7 ETM+ scenes. Processed Landsat Scenes (16 bit) are Level 1Gt NLAPS scenes converted to 16 bit, processed with sun-angle correction, and converted to reflectance values (Bindschadler 2008). Each Landsat scene is ... \nUSGS/LIMA/SR, antarctica,ice,landsat-derived,lima,mosaic,satellite-imagery,sr,usgs \n1999-06-30T00:00:00Z/2002-09-04T00:00:00Z \n-90 -180 -55 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://lima.usgs.gov/index.php)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/USGS_LIMA_SR)"]]
