Esses mosaicos do Landsat 5 TM Collection 1 Tier 1 são feitos de cenas ortorretificadas de nível 1, usando a refletância calculada no topo da atmosfera (TOA, na sigla em inglês).
Consulte Chander et al. (2009) para mais detalhes sobre o cálculo do TOA.
Essas composições são criadas com todas as cenas de cada período de oito dias, começando no primeiro dia do ano e continuando até o 360º dia. O último período composto do ano, que começa no dia 361, vai se sobrepor ao primeiro período composto do ano seguinte em três dias. Todas as imagens de cada período de oito dias são incluídas na composição, com o pixel mais recente como o valor composto.
Bandas
Bandas
Nome
Tamanho do pixel
Comprimento de onda
Descrição
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
Vermelho
B4
30 metros
0,76 a 0,90 μm
Infravermelho próximo
B5
30 metros
1,55 a 1,75 μm
Infravermelho de ondas curtas 1
B6
30 metros
10,40 a 12,50 μm
Infravermelho térmico 1. Reamostrada de 60 para 30 minutos.
Os conjuntos de dados do Landsat são criados pelo governo federal e, portanto, pertencem ao domínio público. Eles podem ser usados, transferidos ou reproduzidos sem restrição de direitos autorais.
O USGS precisa ser reconhecido ou creditado como fonte de dados. Para isso, inclua uma linha de citação de texto, como no exemplo abaixo.
(Nome do produto, da imagem, da fotografia ou do conjunto de dados) cortesia do Serviço Geológico dos EUA
Exemplo: imagem do Landsat-7 cortesia do U.S. Geological Survey
Esses mosaicos do Landsat 5 TM Collection 1 Tier 1 são feitos de cenas ortorretificadas de nível 1, usando a refletância calculada no topo da atmosfera (TOA, na sigla em inglês). Consulte Chander et al. (2009) para mais detalhes sobre o cálculo do TOA. Esses mosaicos são criados com base em todas as cenas de cada período de oito dias, começando no primeiro dia…
[[["Fácil de entender","easyToUnderstand","thumb-up"],["Meu problema foi resolvido","solvedMyProblem","thumb-up"],["Outro","otherUp","thumb-up"]],[["Não contém as informações de que eu preciso","missingTheInformationINeed","thumb-down"],["Muito complicado / etapas demais","tooComplicatedTooManySteps","thumb-down"],["Desatualizado","outOfDate","thumb-down"],["Problema na tradução","translationIssue","thumb-down"],["Problema com as amostras / o código","samplesCodeIssue","thumb-down"],["Outro","otherDown","thumb-down"]],[],[[["\u003cp\u003eThe Landsat 5 TM Collection 1 Tier 1 8-Day TOA Reflectance Composite dataset provides top-of-atmosphere reflectance data from orthorectified scenes.\u003c/p\u003e\n"],["\u003cp\u003eData is composited over 8-day periods, using the most recent pixel as the composite value.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from January 1, 1984, to April 30, 2012, and includes spectral bands from blue to shortwave infrared, along with a quality assessment band.\u003c/p\u003e\n"],["\u003cp\u003eLandsat data is in the public domain and can be used without copyright restrictions, but requires proper citation of the USGS.\u003c/p\u003e\n"],["\u003cp\u003eGoogle Earth Engine provides access to this dataset for research, education, and non-profit purposes.\u003c/p\u003e\n"]]],[],null,["# Landsat 5 TM Collection 1 Tier 1 8-Day TOA Reflectance Composite\n\nDataset Availability\n: 1984-01-01T00:00:00Z--2012-04-30T00:00:00Z\n\nDataset Provider\n:\n\n\n [Google](https://earthengine.google.com)\n\nTags\n:\n[8day](/earth-engine/datasets/tags/8day) [landsat](/earth-engine/datasets/tags/landsat) [toa](/earth-engine/datasets/tags/toa) [usgs](/earth-engine/datasets/tags/usgs) \n\n#### Description\n\nThese Landsat 5 TM Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the\ncomputed top-of-atmosphere (TOA) reflectance.\nSee [Chander et al. (2009)](https://www.sciencedirect.com/science/article/pii/S0034425709000169)\nfor details on the TOA computation.\n\nThese composites are created from\nall the scenes in each\n8-day period beginning from the first day of the year and continuing\nto the 360th day of the year. The last composite of the year,\nbeginning on day 361, will overlap the first composite of the\nfollowing year by 3 days. All the images from each 8-day period are\nincluded in the composite, with the most recent pixel as the composite value.\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 | 0.76 - 0.90 μm | Near infrared |\n| `B5` | 30 meters | 1.55 - 1.75 μm | Shortwave infrared 1 |\n| `B6` | 30 meters | 10.40 - 12.50 μm | Thermal Infrared 1. Resampled from 60m to 30m. |\n| `B7` | 30 meters | 2.08 - 2.35 μm | Shortwave infrared 2 |\n| `BQA` | 30 meters | | Landsat Collection 1 QA Bitmask ([See Landsat QA page](https://www.usgs.gov/land-resources/nli/landsat/landsat-collection-1-level-1-quality-assessment-band)) |\n| Bitmask for BQA - Bit 0: Designated Fill - 0: No - 1: Yes - Bit 1: Designated Pixel - 0: No - 1: Yes - Bits 2-3: Radiometric Saturation - 0: No bands contain saturation - 1: 1-2 bands contain saturation - 2: 3-4 bands contain saturation - 3: 5 or more bands contain saturation - Bit 4: Cloud - 0: No - 1: Yes - Bits 5-6: Cloud Confidence - 0: Not Determined / Condition does not exist. - 1: Low, (0-33 percent confidence) - 2: Medium, (34-66 percent confidence) - 3: High, (67-100 percent confidence) - Bits 7-8: Cloud Shadow Confidence - 0: Not Determined / Condition does not exist. - 1: Low, (0-33 percent confidence) - 2: Medium, (34-66 percent confidence) - 3: High, (67-100 percent confidence) - Bits 9-10: Snow / Ice Confidence - 0: Not Determined / Condition does not exist. - 1: Low, (0-33 percent confidence) - 2: Medium, (34-66 percent confidence) - 3: High, (67-100 percent confidence) ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n### Terms of Use\n\n**Terms of Use**\n\nLandsat datasets are federally created data\nand therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction.\n\nAcknowledgement or credit of the USGS as data source should be provided\nby including a line of text citation such as the example shown below.\n\n(Product, Image, Photograph, or Dataset Name) courtesy of\nthe U.S. Geological Survey\n\nExample: Landsat-7 image courtesy of the U.S. Geological Survey\n\nSee the\n[USGS Visual Identity System Guidance](https://www.usgs.gov/information-policies-and-instructions/usgs-visual-identity-system)\nfor further details on proper citation and acknowledgement of USGS products.\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[Landsat 5 TM Collection 1 Tier 1 8-Day TOA Reflectance Composite](/earth-engine/datasets/catalog/LANDSAT_LT05_C01_T1_8DAY_TOA) \nThese Landsat 5 TM Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the computed top-of-atmosphere (TOA) reflectance. See Chander et al. (2009) for details on the TOA computation. These composites are created from all the scenes in each 8-day period beginning from the first day ... \nLANDSAT/LT05/C01/T1_8DAY_TOA, 8day,landsat,toa,usgs \n1984-01-01T00:00:00Z/2012-04-30T00:00:00Z \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://earthengine.google.com)"]]
