VNP09H1 v001

VIIRS/NPP Surface Reflectance 8-Day L3 Global 500 m SIN Grid


PI: Eric Vermote

Description

The 8-day Visible Infrared Imaging Radiometer Suite (VIIRS) Surface Reflectance (VNP09H1) Version 1 composite product provides an estimate of land surface reflectance from the Suomi National Polar-orbiting Partnership (S-NPP) VIIRS sensor for three imagery bands (I1, I2, I3) at nominal 500 meter resolution (~463 meter). The 500 meter dataset is derived through resampling the native 375 meter VIIRS resolution in the L2 input product. The data are corrected for atmospheric conditions such as the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols. Each pixel represents the best possible Level 2G observation during an 8-day period, which is selected on the basis of high observation coverage, low sensor angle, the absence of clouds or cloud shadow, and aerosol loading. The three reflectance bands, this product includes a state quality assurance (QA) layer and a reflectance band quality layer.

Characteristics

Product Maturity

VIIRS surface reflectance products have reached maturity level of stage 1 validation. Visit VIIRS Land Product Quality Assessment product maturity for additional information on validation and product maturity status.

Collection and Granule

Collection

Characteristic Description
CollectionS-NPP VIIRS
DOI10.5067/VIIRS/VNP09H1.001
File Size~25 MB
Temporal ResolutionMulti-Day
Temporal Extent2012-01-17 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers5
Columns/Rows2400 x 2400
Pixel Size500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
SurfReflect_I1 500 m Surface Reflectance Band I1 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
SurfReflect_I2 500 m Surface Reflectance Band I2 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
SurfReflect_I3 500 m Surface Reflectance Band I3 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
SurfReflect_State_500m Surface Reflectance State Quality Assurance (QA) Bit Field 16-bit unsigned integer 65535 N/A 0 to 13311 N/A N/A
SurfReflect_QC_500m Surface Reflectance Band Quality Control (QC) Bit Field 16-bit unsigned integer 65535 N/A 0 to 32767 N/A N/A

Product Quality

The bit field mappings for QC and State QA layers are provided in Section 3.3 Tables 17 and 19 of the User Guide.

The following metadata related changes have been made to the User Guide:

  • Valid Range of 0 to 13311 for the SurfReflect_State_500m layer (Table 8).
  • Description of Bits 10-11 in the SurfReflect_State_500m layer changed from “Internal cloud algorithm flag” and “Internal fire algorithm flag” changed to "Spare (Unused)" (Table 19).
  • Bits 2-3 “Cloud State” in the SurfReflect_QC_500m layer set to 11 redirects users to utilize Bits 0-1 “Cloud State” in the SurfReflect_State_500m layer (Table 17).

The following changes have been implemented in the data:

  • Fill Value for Surface Reflectance Bands changed from 0 to -28672 for forward processing as of May 25, 2017.
  • Fill Value for the SurfReflect_QC_500m layer set to reflect 65535 for forward processing as of August 21, 2017.
  • Bit 12 “Atmospheric Correction Performed” in the SurfReflect_QC_500m layer set to "Yes" for forward processing as of August 21, 2017.

For complete information about product quality, refer to the VIIRS Land Product Quality Assessment website.

Known Issues

Known issues for VIIRS Surface Reflectance data products can be found in Section 4.0 “Caveats and Known Problems” of the User Guide.

Documentation

Using the Data

E-Learning

Getting Started with VIIRS Surface Reflectance Data Part 1: All About Accessing Data

Getting Started with VIIRS Surface Reflectance Data Part 2: Using the Data

Getting Started with VIIRS Surface Reflectance Data Part 3: Interpreting Quality Information

Land Ho! Exploring Earth’s Land Surface with Suomi NPP NASA VIIRS Land Data

Tools

Citation

DOI: 10.5067/VIIRS/VNP09H1.001

About the Image