O Operational Line-Scan System (OLS) do Defense Meteorological Program (DMSP) tem uma capacidade exclusiva de detectar fontes de emissão visíveis e de infravermelho próximo (VNIR) à noite.
Essa coleção contém imagens globais de luzes noturnas sem saturação do sensor. O sensor geralmente é operado em uma configuração de alto ganho para permitir a detecção de nuvens iluminadas pela lua. No entanto, com quantização de seis bits e faixa dinâmica limitada, os dados gravados ficam saturados nos núcleos brilhantes dos centros urbanos. Um conjunto limitado de observações com baixa iluminação lunar foi obtido quando o ganho do detector foi definido significativamente abaixo da configuração operacional típica (às vezes por um fator de 100). Os dados esparsos adquiridos em configurações de baixo ganho foram combinados com os dados operacionais adquiridos em configurações de alto ganho para produzir o conjunto de imagens globais de luzes noturnas sem saturação do sensor. Dados de diferentes satélites foram combinados e mesclados no produto final para maximizar a cobertura. Para mais informações, consulte este arquivo
readme
do provedor.
Processamento de imagens e dados pelo National Geophysical Data Center da NOAA.
Dados do DMSP coletados pela Agência de Meteorologia da Força Aérea dos EUA.
Bandas
Tamanho do pixel 927,67 metros
Bandas
Nome
Mín.
Máx.
Tamanho do pixel
Descrição
avg_vis
0*
6060,6*
metros
Números médios de banda digital de observações com detecção de luz sem nuvens.
cf_cvg
0*
175*
metros
Coberturas sem nuvens, o número total de observações que entraram em cada célula de grade de 30 segundos de arco. Essa imagem pode ser usada para identificar áreas com poucos números de observações em que a qualidade é reduzida.
* valor mínimo ou máximo estimado
Termos de Uso
Termos de Uso
Os dados, as informações e os produtos da NOAA, independentemente do método de entrega, não estão sujeitos a direitos autorais e não têm restrições quanto ao uso posterior pelo público. Depois de obtidos, eles podem ser usados para qualquer finalidade legal. Os dados acima estão em domínio público e são fornecidos sem restrição de uso e distribuição.
O Operational Line-Scan System (OLS) do Defense Meteorological Program (DMSP) tem uma capacidade exclusiva de detectar fontes de emissão visíveis e no infravermelho próximo (VNIR) à noite. Essa coleção contém imagens globais de luzes noturnas sem saturação do sensor. O sensor geralmente é operado em uma configuração de alto ganho para permitir a detecção de nuvens iluminadas pela lua. …
[null,null,[],[[["\u003cp\u003eThe NOAA/DMSP-OLS/CALIBRATED_LIGHTS_V4 dataset provides global nighttime lights images with no sensor saturation, covering 1996 to 2011.\u003c/p\u003e\n"],["\u003cp\u003eIt utilizes data from the Defense Meteorological Program (DMSP) Operational Line-Scan System (OLS) to detect visible and near-infrared emissions at night.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes two bands: 'avg_vis' representing average visible light and 'cf_cvg' indicating cloud-free coverage.\u003c/p\u003e\n"],["\u003cp\u003eImages are at a 30 arc second resolution, which is approximately 927 meters.\u003c/p\u003e\n"],["\u003cp\u003eThe data is in the public domain and freely available for use and distribution without restriction.\u003c/p\u003e\n"]]],[],null,["# DMSP OLS: Global Radiance-Calibrated Nighttime Lights Version 4, Defense Meteorological Program Operational Linescan System\n\nDataset Availability\n: 1996-03-16T00:00:00Z--2011-07-31T00:00:00Z\n\nDataset Provider\n:\n\n\n [Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines](https://eogdata.mines.edu/dmsp/download_radcal.html)\n\nTags\n:\n [dmsp](/earth-engine/datasets/tags/dmsp) [eog](/earth-engine/datasets/tags/eog) [imagery](/earth-engine/datasets/tags/imagery) [lights](/earth-engine/datasets/tags/lights) [nighttime](/earth-engine/datasets/tags/nighttime) [ols](/earth-engine/datasets/tags/ols) [population](/earth-engine/datasets/tags/population) [radiance](/earth-engine/datasets/tags/radiance) [visible](/earth-engine/datasets/tags/visible) [yearly](/earth-engine/datasets/tags/yearly) \ncalibrated \n\n#### Description\n\nThe Defense Meteorological Program (DMSP) Operational Line-Scan System\n(OLS) has a unique capability to detect visible and near-infrared (VNIR)\nemission sources at night.\n\nThis collection contains global nighttime lights images with no sensor\nsaturation. The sensor is typically operated at a high-gain setting to\nenable the detection of moonlit clouds. However, with six bit quantization\nand limited dynamic range, the recorded data are saturated in the bright\ncores of urban centers. A limited set of observations at low lunar\nillumination were obtained where the gain of the detector was set\nsignificantly lower than its typical operational setting (sometimes by a\nfactor of 100). Sparse data acquired at low-gain settings were combined\nwith the operational data acquired at high-gain settings to produce the set\nof global nighttime lights images with no sensor saturation. Data from\ndifferent satellites were merged and blended into the final product in order\nto gain maximum coverage. For more information, see this\n[readme](https://eogdata.mines.edu/dmsp/radcal_readme.txt)\nfile from the provider.\n\nImage and data processing by NOAA's National Geophysical Data Center.\nDMSP data collected by US Air Force Weather Agency.\n\n### Bands\n\n\n**Pixel Size**\n\n927.67 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|-----------|-----|----------|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `avg_vis` | 0\\* | 6060.6\\* | meters | Average digital band numbers from observations with cloud-free light detection. |\n| `cf_cvg` | 0\\* | 175\\* | meters | Cloud-free coverages, the total number of observations that went into each 30-arc second grid cell. This image can be used to identify areas with low numbers of observations where the quality is reduced. |\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\nNOAA data, information, and products, regardless of the method of delivery,\nare not subject to copyright and carry no restrictions on their subsequent\nuse by the public. Once obtained, they may be put to any lawful use. The\nforgoing data is in the public domain and is being provided without\nrestriction on use and distribution.\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('NOAA/DMSP-OLS/CALIBRATED_LIGHTS_V4')\n .filter(ee.Filter.date('2010-01-01', '2010-12-31'));\nvar nighttimeLights = dataset.select('avg_vis');\nvar nighttimeLightsVis = {\n min: 3.0,\n max: 60.0,\n};\nMap.setCenter(7.82, 49.1, 4);\nMap.addLayer(nighttimeLights, nighttimeLightsVis, 'Nighttime Lights');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NOAA/NOAA_DMSP-OLS_CALIBRATED_LIGHTS_V4) \n[DMSP OLS: Global Radiance-Calibrated Nighttime Lights Version 4, Defense Meteorological Program Operational Linescan System](/earth-engine/datasets/catalog/NOAA_DMSP-OLS_CALIBRATED_LIGHTS_V4) \nThe Defense Meteorological Program (DMSP) Operational Line-Scan System (OLS) has a unique capability to detect visible and near-infrared (VNIR) emission sources at night. This collection contains global nighttime lights images with no sensor saturation. The sensor is typically operated at a high-gain setting to enable the detection of moonlit clouds. ... \nNOAA/DMSP-OLS/CALIBRATED_LIGHTS_V4, dmsp,eog,imagery,lights,nighttime,ols,population,radiance,visible,yearly \n1996-03-16T00:00:00Z/2011-07-31T00:00:00Z \n-65 -180 75 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://eogdata.mines.edu/dmsp/download_radcal.html)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NOAA_DMSP-OLS_CALIBRATED_LIGHTS_V4)"]]
