VNP09CMG v001

VIIRS/NPP Surface Reflectance Daily L3 Global 0.05 Deg CMG


PI: Eric Vermote

Description

The Visible Infrared Imaging Radiometer Suite (VIIRS) daily surface reflectance Climate Modeling Grid (VNP09CMG) Version 1 product provides an estimate of land surface reflectance from the Suomi National Polar-Orbiting Partnership (S-NPP) VIIRS sensor. Data are provided for three imagery bands (I1-I3) and nine moderate resolution bands (M1-M5, M7, M8, M10, M11) at 0.05 degree (~5,600 meter) resolution. 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. This product uses a weighted average of the best quality observation and is formatted as a CMG for use in climate simulation models. This product includes the twelve reflectance bands, five moderate resolution brightness temperature bands (M12-M16) and information layers representing relative azimuth angle, sensor zenith angle, solar zenith angle, reflectance band quality, time of day, and number mapping.

read more

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/VNP09CMG.001
File Size~850 MB
Temporal ResolutionDaily
Temporal Extent2012-01-19 to Present
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumN/A
File FormatHDF-EOS5
Geographic DimensionsGlobal

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers32
Columns/Rows7200 x 3600
Pixel Size5600 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
SurfReflect_I1 Surface Reflectance CMG Band I1 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_I2 Surface Reflectance CMG Band I2 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_I3 Surface Reflectance CMG Band I3 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M1_1 Surface Reflectance CMG Band M1 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M2_1 Surface Reflectance CMG Band M2 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M3_1 Surface Reflectance CMG Band M3 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M4_1 Surface Reflectance CMG Band M4 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M5_1 Surface Reflectance CMG Band M5 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M7_1 Surface Reflectance CMG Band M7 N/A 16-bit unsigned integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M8_1 Surface Reflectance CMG Band M8 N/A 16-bit unsigned integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M10_1 Surface Reflectance CMG Band M10 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_M11_1 Surface Reflectance CMG Band M11 N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001
SurfReflect_QF_1 Quality Flag 1 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
SurfReflect_QF_2 Quality Flag 2 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
SurfReflect_QF_3 Quality Flag 3 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
SurfReflect_QF_4 Quality Flag 4 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
SurfReflect_QF_5 Quality Flag 5 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
SurfReflect_QF_6 Quality Flag 6 Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A
BrightTemp_M12 Brightness Temperature CMG Band M12 Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
BrightTemp_M13 Brightness Temperature CMG Band M13 Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
BrightTemp_M14 Brightness Temperature CMG Band M14 Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
BrightTemp_M15 Brightness Temperature CMG Band M15 Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
BrightTemp_M16 Brightness Temperature CMG Band M16 Kelvin 16-bit unsigned integer 0 N/A 1 to 40000 0.01
Granule_Time Granule Time Hours 16-bit signed integer 0 N/A 1 to 2355 1
Number_Mapping_1 Number Mapping 1 Adjacent cloud/snow N/A 32-bit unsigned integer 0 N/A 1 to 2097151 N/A
Number_Mapping_2 Number Mapping 2 cloud/cloud shadow N/A 32-bit unsigned integer 0 N/A 1 to 2097151 N/A
n_375m_pixels_averaged Number 375 m pixels averaged N/A 16-bit unsigned integer 0 N/A 1 to 800 N/A
n_750m_pixels_averaged Number 750 m pixels averaged N/A 16-bit unsigned integer 0 N/A 1 to 200 N/A
State_QA CMG State Quality Assurance (QA) flags Bit Field 16-bit signed integer 0 N/A 1 to 65535 N/A
RelativeAzimuth Relative azimuth angle Degree 16-bit signed integer 0 N/A 1 to 18000 0.01
SensorZenith Sensor zenith angle Degree 16-bit signed integer 0 N/A 1 to 18000 0.01
SolarZenith Solar zenith angle Degree 16-bit signed integer 0 N/A 1 to 18000 0.01

Product Quality

The bit field mappings for quality flag (QF) layers 1 through 6 and number mapping are provided in Section 3.3 and 3.4 Tables 20 through 22 of the User Guide.

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

Known Issues

The VIIRS Land Surface Reflectance product (VNP09) flags a larger number of retrievals as ‘High Aerosol’ in the quality layer as compared to the MODIS reflectance product. The inaccurately flagged high aerosol quality flags directly impact the quality of the downstream VIIRS BRDF Albedo product (VNP43) in the mid to high latitude, arid lands, and tropical vegetative regions.

Additional 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

Data In Action

Observing Superstorm Sandy with VIIRS and ASTER Data: A 5 Year Review

There's a Hurricane A-comin': Observing the 2017 Atlantic Hurricane Season with Satellite Imagery

Tools

Citation

DOI: 10.5067/VIIRS/VNP09CMG.001

About the Image

A global image of the VNP09CMG surface reflectance band M5-M4-M3 data from September 17, 2018.

View full-size image