VNP09CMG: VIIRS/NPP Surface Reflectance Daily L3 Global 0.05Deg CMG V001

VNP09CMG. Acquired January 6, 2015. Western US.

DOI

10.5067/VIIRS/VNP09CMG.001

Product	Reflectance
Dataset	S-NPP VIIRS
Dataset Version	1
Pixel Size	5600
Temporal Granularity	Daily
Spatial Extent	Global
Data Access	Earthdata Search Client, Reverb, DAAC2Disk, Data Pool

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, I2, I3) and nine moderate-resolution bands (M1, M2, M3, M4, 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. Included in the product along with the twelve reflectance bands are five moderate-resolution brightness temperature bands (M12, M13, M14, M15, M16) and information layers representing solar and sensor azimuth and zenith angles, reflectance band quality, time of day, and number mapping. Validation at stage 1 is complete for VIIRS surface reflectance products.

Citation

PI Name: Eric Vermote (NASA GSFC)

DOI: 10.5067/VIIRS/VNP09CMG.001

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Characteristics

Collection

Characteristic	Description
Temporal Granularity	Daily
Temporal Extent	January 19, 2012 -- Present
Spatial Extent	Global
File Size	~850 MB
Coordinate System	Geographic Latitude and Longitude
Datum	N/A
File Format	HDF-EOS5
Geographic Dimensions	Global

Granule

Characteristic	Description
Number of Science Dataset (SDS) Layers	32
Columns/Rows	7200 x 3600
Pixel Size	5600 m

Data Layer Characteristics

SDS Name	Description	Units	Data Type	Fill Value	Valid Range	Scale Factor
SurfReflect_I1	Surface Reflectance CMG Band I1	Reflectance	16 bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_I2	Surface Reflectance CMG Band I2	Reflectance	16 bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_I3	Surface Reflectance CMG Band I3	Reflectance	16 bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M1_1	Surface Reflectance CMG Band M1	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M2_1	Surface Reflectance CMG Band M2	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M3_1	Surface Reflectance CMG Band M3	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M4_1	Surface Reflectance CMG Band M4	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M5_1	Surface Reflectance CMG Band M5	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M7_1	Surface Reflectance CMG Band M7	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M8_1	Surface Reflectance CMG Band M8	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M10_1	Surface Reflectance CMG Band M10	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M11_1	Surface Reflectance CMG Band M11	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_QF_1	Quality Flag 1	Bit Field	8-bit unsigned integer	255	0 to 255	NA
SurfReflect_QF_2	Quality Flag 2	Bit Field	8-bit unsigned integer	255	0 to 255	NA
SurfReflect_QF_3	Quality Flag 3	Bit Field	8-bit unsigned integer	255	0 to 255	NA
SurfReflect_QF_4	Quality Flag 4	Bit Field	8-bit unsigned integer	255	0 to 255	NA
SurfReflect_QF_5	Quality Flag 5	Bit Field	8-bit unsigned integer	255	0 to 255	NA
SurfReflect_QF_6	Quality Flag 6	Bit Field	8-bit unsigned integer	255	0 to 255	NA
BrightTemp_M12	Brightness Temperature CMG Band M12	Kelvin	16-bit unsigned integer	0	0 to 40000	0.01
BrightTemp_M13	Brightness Temperature CMG Band M13	Kelvin	16-bit unsigned integer	0	0 to 40000	0.01
BrightTemp_M14	Brightness Temperature CMG Band M14	Kelvin	16-bit unsigned integer	0	0 to 40000	0.01
BrightTemp_M15	Brightness Temperature CMG Band M15	Kelvin	16-bit unsigned integer	0	0 to 40000	0.01
BrightTemp_M16	Brightness Temperature CMG Band M16	Kelvin	16-bit unsigned integer	0	0 to 40000	0.01
Granule_Time	Granule Time	HHMM	16-bit signed integer	0	0 to 2355	1
Number_Mapping_1	Number Mapping 1 Adjacent cloud/snow	None	32-bit unsigned integer	0	0 to 2097151	NA
Number_Mapping_2	Number Mapping 2 cloud/cloud shadow	None	32-bit unsigned integer	0	0 to 2097151	NA
n_375m_pixels_averaged	Number 500 m pixels averaged	None	16-bit unsigned integer	0	1 to 200	NA
n_750m_pixels_averaged	Number 1000 m pixels averaged	None	16-bit unsigned integer	0	1 to 400	NA
State_QA	CMG state quality assurance flags	Bit Field	16-bit signed integer	0	1 to 65535	NA
RelativeAzimuth	Relative azimuth angle	Degree	16-bit signed integer	0	-18000 to 18000	0.01
SensorZenith	Sensor zenith angle	Degree	16-bit signed integer	0	0 to 18000	0.01
SolarZenith	Solar zenith angle	Degree	16-bit signed integer	0	0 to 18000	0.01

Product Quality

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

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

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

User Guide
Algorithm Theoretical Basis Document (ATBD)

Tools

Data Access

Earthdata Search Client
Reverb
DAAC2Disk
Data Pool

Resources

E-Learning

Title	Author	Links
How to Reformat and Georeference VIIRS Surface Reflectance HDF-EOS5 Files	LP DAAC	Tutorial
R You Ready to Python? An Introduction to Working with Land Remote Sensing Data in R and Python	LP DAAC	Webinar, Presentation