The 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 the
ninth day, which is reflected in the file name. The view angle effects are
removed from the directional reflectances, resulting in a stable and
consistent NBAR product. The VNP43 data products are designed to promote the
continuity of NASA's Moderate Resolution Imaging Spectroradiometer (MODIS)
BRDF/Albedo data product suite.
The VNP43 algorithm uses the RossThick/Li-Sparse-Reciprocal (RTLSR)
semi-empirical kernel-driven BRDF model, with the three kernel weights from
VNP43IA1 to reconstruct surface anisotropic effects, correcting the
directional reflectance to a common view geometry (VNP43IA4), while
also computing integrated black-sky albedo (BSA) at local solar noon and
white-sky albedo (WSA) (VNP43IA3). Researchers can use the BRDF model
parameters with a simple polynomial, to obtain black-sky albedo at any solar
illumination angle. Likewise, both the BSA and WSA Science Dataset (SDS)
layers can be used with a simple polynomial, to manually estimate
instantaneous actual albedo (blue-sky albedo). Additional details regarding
the methodology are available in the Algorithm Theoretical Basis Document
(ATBD).
Nadir BRDF/Albedo Reflectance at local solar noon for band
I1
Nadir_Reflectance_I2
meters
Nadir BRDF/Albedo Reflectance at local solar noon for band
I2
Nadir_Reflectance_I3
meters
Nadir BRDF/Albedo Reflectance at local solar noon for band
I3
Terms of Use
Terms of Use
LP DAAC NASA data are freely accessible; however, when an author
publishes these data or works based on the data, it is requested that the
author cite the datasets within the text of the publication and include a
reference to them in the reference list.
Citations
Citations:
Schaaf, C., Z. Wang, A. Erb, I. Paynter. VIIRS/NPP BRDF/Albedo Nadir
BRDF-Adjusted Ref Daily L3 Global 500m SIN Grid V002. 2024, distributed by
NASA EOSDIS Land Processes Distributed Active Archive Center,
10.5067/VIIRS/VNP43IA4.002.
The 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 …
[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)"]]
