Das Produkt „NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Nadir Bidirectional Reflectance Distribution Function (BRDF) Adjusted Reflectance (NBAR) Version 2“ bietet NBAR-Schätzungen mit einer Auflösung von 500 Metern. Das Produkt VNP43IA4 wird täglich aus 16 Tagen VIIRS-Daten erstellt und zeitlich auf den neunten Tag gewichtet, was sich im Dateinamen widerspiegelt. Die Auswirkungen des Betrachtungswinkels werden aus den gerichteten Reflexionen entfernt, was zu einem stabilen und konsistenten NBAR-Produkt führt. Die VNP43-Datenprodukte sollen die Kontinuität der BRDF-/Albedo-Datenproduktreihe des Moderate Resolution Imaging Spectroradiometer (MODIS) der NASA fördern.
Der VNP43-Algorithmus verwendet das semi-empirische, kernelbasierte BRDF-Modell (Bidirectional Reflectance Distribution Function) RossThick/Li-Sparse-Reciprocal (RTLSR) mit den drei Kernelgewichten aus VNP43IA1, um anisotrope Oberflächeneffekte zu rekonstruieren und die gerichtete Reflexion auf eine gemeinsame Ansichtsgeometrie (VNP43IA4) zu korrigieren. Außerdem wird die integrierte Black-Sky-Albedo (BSA) am lokalen Mittag und die White-Sky-Albedo (WSA) (VNP43IA3) berechnet. Forscher können die BRDF-Modellparameter mit einem einfachen Polynom verwenden, um die Black-Sky-Albedo bei jedem Sonnenbeleuchtungswinkel zu berechnen. Sowohl die BSA- als auch die WSA-SDS-Ebenen (Science Dataset) können mit einem einfachen Polynom verwendet werden, um die momentane tatsächliche Albedo (Blue-Sky-Albedo) manuell zu schätzen. Weitere Informationen zur Methodik finden Sie im Algorithm Theoretical Basis Document (ATBD).
Nadir-BRDF-/Albedo-Reflexion am lokalen Sonnenhöchststand für Band I1
Nadir_Reflectance_I2
Meter
Nadir-BRDF-/Albedo-Reflexion am lokalen Sonnenhöchststand für Band I2
Nadir_Reflectance_I3
Meter
Nadir-BRDF-/Albedo-Reflexion am lokalen Sonnenhöchststand für Band I3
Nutzungsbedingungen
Nutzungsbedingungen
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Zitate
Zitate:
Schaaf, C., Z. Wang, A. Erb, I. Paynter. VIIRS/NPP BRDF/Albedo Nadir
BRDF-Adjusted Ref Daily L3 Global 500m SIN Grid V002. 2024, verteilt von NASA EOSDIS Land Processes Distributed Active Archive Center, 10.5067/VIIRS/VNP43IA4.002.
Das Produkt „Nadir Bidirectional Reflectance Distribution Function (BRDF) Adjusted Reflectance (NBAR) Version 2“ der Visible Infrared Imaging Radiometer Suite (VIIRS) der NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) bietet NBAR-Schätzungen mit einer Auflösung von 500 Metern. Das Produkt VNP43IA4 wird täglich aus 16 Tagen VIIRS-Daten erstellt und zeitlich gewichtet, um …
[null,null,[],[],[],null,["# VNP43IA4: BRDF/Albedo Quality Daily L3 Global 500m SIN Grid\n\nDataset Availability\n: 2012-01-17T00:00:00Z--2025-08-12T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/VIIRS/VNP43IA4.002)\n\nCadence\n: 1 Day\n\nTags\n:\n[brdf](/earth-engine/datasets/tags/brdf) [land](/earth-engine/datasets/tags/land) [nasa](/earth-engine/datasets/tags/nasa) [noaa](/earth-engine/datasets/tags/noaa) [satellite-imagery](/earth-engine/datasets/tags/satellite-imagery) [surface](/earth-engine/datasets/tags/surface) [viirs](/earth-engine/datasets/tags/viirs) \n\n#### Description\n\nThe NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible\nInfrared Imaging Radiometer Suite (VIIRS) Nadir Bidirectional Reflectance\nDistribution Function (BRDF) Adjusted Reflectance (NBAR) Version 2 product\nprovides NBAR estimates at 500 meter resolution. The VNP43IA4 product is\nproduced daily using 16 days of VIIRS data and is weighted temporally to the\nninth day, which is reflected in the file name. The view angle effects are\nremoved from the directional reflectances, resulting in a stable and\nconsistent NBAR product. The VNP43 data products are designed to promote the\ncontinuity of NASA's Moderate Resolution Imaging Spectroradiometer (MODIS)\nBRDF/Albedo data product suite.\n\nThe VNP43 algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR)\nsemi-empirical kernel-driven BRDF model, with the three kernel weights from\nVNP43IA1 to reconstruct surface anisotropic effects, correcting the\ndirectional reflectance to a common view geometry (VNP43IA4), while\nalso computing integrated black-sky albedo (BSA) at local solar noon and\nwhite-sky albedo (WSA) (VNP43IA3). Researchers can use the BRDF model\nparameters with a simple polynomial, to obtain black-sky albedo at any solar\nillumination angle. Likewise, both the BSA and WSA Science Dataset (SDS)\nlayers can be used with a simple polynomial, to manually estimate\ninstantaneous actual albedo (blue-sky albedo). Additional details regarding\nthe methodology are available in the Algorithm Theoretical Basis Document\n(ATBD).\n\nDocumentation:\n\n- [User's Guide](https://www.umb.edu/spectralmass/viirs-user-guides-c1-and-c2/vnp43ia4-and-vnpma4-nbar-products/)\n\n- [Algorithm Theoretical Basis Document (ATBD)](https://lpdaac.usgs.gov/documents/194/VNP43_ATBD_V1.pdf)\n\n- [General Documentation](https://lpdaac.usgs.gov/products/vnp43ia4v002/)\n\n### Bands\n\n\n**Pixel Size**\n\n500 meters\n\n**Bands**\n\n| Name | Pixel Size | Description |\n|-----------------------------------------|------------|---------------------------------------------------------------|\n| `BRDF_Albedo_Band_Mandatory_Quality_I1` | meters | BRDF/Albedo mandatory quality for band I1 |\n| `BRDF_Albedo_Band_Mandatory_Quality_I2` | meters | BRDF/Albedo mandatory quality for band I2 |\n| `BRDF_Albedo_Band_Mandatory_Quality_I3` | meters | BRDF/Albedo mandatory quality for band I3 |\n| `Nadir_Reflectance_I1` | meters | Nadir BRDF/Albedo Reflectance at local solar noon for band I1 |\n| `Nadir_Reflectance_I2` | meters | Nadir BRDF/Albedo Reflectance at local solar noon for band I2 |\n| `Nadir_Reflectance_I3` | meters | Nadir BRDF/Albedo Reflectance at local solar noon for band I3 |\n\n### Terms of Use\n\n**Terms of Use**\n\nLP DAAC NASA data are freely accessible; however, when an author\npublishes these data or works based on the data, it is requested that the\nauthor cite the datasets within the text of the publication and include a\nreference to them in the reference list.\n\n### Citations\n\nCitations:\n\n- Schaaf, C., Z. Wang, A. Erb, I. Paynter. VIIRS/NPP BRDF/Albedo Nadir\n BRDF-Adjusted Ref Daily L3 Global 500m SIN Grid V002. 2024, distributed by\n NASA EOSDIS Land Processes Distributed Active Archive Center,\n [10.5067/VIIRS/VNP43IA4.002](https://doi.org/10.5067/VIIRS/VNP43IA4.002).\n\n### DOIs\n\n- \u003chttps://doi.org/10.5067/VIIRS/VNP43IA4.002\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.ImageCollection('NASA/VIIRS/002/VNP43IA4')\n .filter(ee.Filter.date('2021-06-01', '2021-06-03'));\n\nvar nadir_reflectance_I1 = dataset.select('Nadir_Reflectance_I1').first();\nvar palette = [\n '000080',\n '0000d9',\n '4000ff',\n '8000ff',\n '0080ff',\n '00ffff',\n '00ff80',\n '80ff00',\n 'daff00',\n 'ffff00',\n 'fff500',\n 'ffda00',\n 'ffb000',\n 'ffa400',\n 'ff4f00',\n 'ff2500',\n 'ff0a00',\n 'ff00ff',\n];\nvar visParams = {\n min: 0,\n max: 10000,\n palette: palette,\n};\n\n// cadetblue\nvar background = ee.Image.rgb(95, 158, 160).visualize({min: 0, max: 255});\nvar image = nadir_reflectance_I1.visualize(visParams);\n\nvar lon = -8;\nvar lat = 60;\n\nMap.addLayer(background, {}, 'background');\nMap.addLayer(image, {}, 'Nadir BRDF/Albedo Reflectance I1');\nMap.setCenter(lon, lat, 3);\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_VIIRS_002_VNP43IA4) \n[VNP43IA4: BRDF/Albedo Quality Daily L3 Global 500m SIN Grid](/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP43IA4) \nThe NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Nadir Bidirectional Reflectance Distribution Function (BRDF) Adjusted Reflectance (NBAR) Version 2 product provides NBAR estimates at 500 meter resolution. The VNP43IA4 product is produced daily using 16 days of VIIRS data and is weighted temporally to ... \nNASA/VIIRS/002/VNP43IA4, brdf,land,nasa,noaa,satellite-imagery,surface,viirs \n2012-01-17T00:00:00Z/2025-08-12T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5067/VIIRS/VNP43IA4.002](https://doi.org/https://doi.org/10.5067/VIIRS/VNP43IA4.002)\n- [https://doi.org/10.5067/VIIRS/VNP43IA4.002](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP43IA4)"]]
