NASA BRDF/Albedo/NBAR Products

Product User GuidePI - Crystal Schaaf (UMass Boston)
Product ATBDCollaborators: Zhuosen Wang, Dorothy Hall, George Riggs, Mark Tschudi,
Xiaoyang Zhang


BRDF, Albedo and NBAR

NDVI Variance

VIIRS BRDF/Albedo/NBAR - Inter-comparison with MODIS

The VNP43 product will deliver climate-quality consistent daily Suomi-NPP VIIRS Albedo, Bidirectional Reflectance Distribution Functions (BRDF), and Nadir BRDF-Adjusted Reflectance (NBAR) quantities. This product will include new narrow-to-broadband coefficients (N2B) and production of gap-filled climate modeling grid (CMG) products. This project supports of the Direct Broadcast and near real time (NRT) communities and builds on the long standing MODIS heritage by producing and delivering an algorithm for Suomi NPP VIIRS that includes extensive accompanying quality and uncertainty information for the user.

 


 

Product Details and links to LPDAAC

Product Name Product ID
NPP/VIIRS BRDF/Albedo Model Parameters 500m VNP43IA1
NPP/VIIRS BRDF/Albedo Quality 500m VNP43IA2
NPP/VIIRS Albedo 500m VNP43IA3
NPP/VIIRS Nadir BRDF-Adjusted Reflectance (NBAR) 500m VNP43IA4
NPP/VIIRS BRDF/Albedo Model Parameters 1km VNP43MA1
NPP/VIIRS BRDF/Albedo Quality 1km VNP43MA2
NPP/VIIRS Albedo 1km VNP43MA3
NPP/VIIRS Nadir BRDF-Adjusted Reflectance (NBAR) 1km VNP43MA4
NPP/VIIRS BRDF/Albedo Model Parameters CMG VNP43C1
NPP/VIIRS BRDF/Albedo Model Snow-Free Parameters CMG VNP43C2
NPP/VIIRS Albedo CMG VNP43C3
NPP/VIIRS Nadir BRDF-Adjusted Reflectance (NBAR) CMG VNP43C4
NPP/VIIRS 30-Arc second BRDF parameters CMG VNP43D*
NPP/VIIRS Gap-Filled Snow-Free CMG VNP43GF

 

Validation Plan

Tower albedometer data

  • Baseline Surface Radiation Network, (NOAA SURFRAD, DOE/ARM - US only)
  • National Ecological Observatory (NEON - US only)
  • International Long Term Ecological Research sites (ILTER) - Terrestrial Ecosystem Research Network (TERN) in Australia, the Greenland Climate Network (GCNet)
  • International Fluxnet tower networks (currently accessed through the Biogeochemical Dynamics DAAC at ORNL)

Albedo Validation Protocol

As part of the CEOS Working Group on Calibration and Validation (WGCV) Land Product Validation (LPV) Subgroup, the Surface Radiation focus area is currently deveoping a protocol for validation of satellite albedo products.

  • Sites that are spatially-representative at 500m to 2km resolution are considered
  • Landsat (also SPOT/Sentinel-2/Commercial High Resolution) used to determine representativeness

Intercomparisons with MODIS and other well-established concurrent satellite products

  • MSG/SEVIRI etc.

Campaigns of opportunity (Cloud Absorption Radiometer - CAR)