NASA Surface Reflectance Products

Product User GuidePI - Eric Vermote (NASA GSFC)
Product ATBD Co-Is: Belen Franch (UMD), Martin Claverie (UMD)


Development of the VIIRS climate quality surface reflectance product suite

VIIRS SR algorithm

VIIRS proposed SR algorithm

The primary objective of this project is the development of a well-calibrated, high quality, daily, multispectral-land surface reflectance product from the VIIRS sensor, providing global land observations to meet the needs of NASA Earth System Science and Applied Sciences and continuity with the EOS-MODIS surface reflectance product. The VIIRS surface reflectance product is direct heritage from collection 5 MODIS. MODIS algorithm refinements from Collection 6 will be integrated into the VIIRS algorithm, and they will be shared with the NOAA JPSS project for possible inclusion in future versions of the operational NOAA product.

The choice for the aerosol model is either Urban/Smoke, Low or High absorption. For each aerosol model, we calculate the average quadratic difference (model residual) between the retrieved and predicted surface reflectances as:

VIIRS SR algorithm

where Ρsred is the surface reflectance retrieved at 670 nm by using the optical thickness derived from 470 nm, and αi,red are ratios between the 412nm, 443nm, 490nm, 2130nm bands and the 670nm band.

The aerosol model that is characterized by the smallest residual is then selected.


Product Details and links to LPDAAC

Product Name Product ID
VIIRS/NPP Surface Reflectance 6-Min Level 2 Swath 375m and 750m VPN09
VIIRS/NPP Surface Reflectance Daily 1km and 500m L2G lite VNP09GA
VIIRS/NPP Surface Reflectance 8-Day L3 500m SIN Grid VNP09H1
VIIRS/NPP Surface Reflectance 8-Day L3 1km SIN Grid VNP09A1
VIIRS/NPP Surface Reflectance Daily L3 Global 0.05 Deg CMG VNP09CMG

 

 

Validation Plan

VIIRS SR product metrics

We plan to validate the VIIRS surface reflectance product over AERONET sites using accuracy, precision, and uncertainty (APU) metrics and perform intercomparisons with MODIS and other sensor surface reflectance products over the BELMANIP 2 sites.