VNP09GA: VIIRS/NPP Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V006

VNP09GA. Acquired January 6, 2015. Tile H08V05. Western US.

DOI

10.5067/VIIRS/VNP09GA.001

Product	Reflectance
Dataset	S-NPP VIIRS
Dataset Version	6
Pixel Size	500, 1000
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 (VNP09GA) 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) at nominal 500 meter resolution (~ 463 meter) and nine moderate-resolution bands (M1, M2, M3, M4, M5, M7, M8, M10, M11) at nominal 1 kilometer (~926 meter) resolution. The 500 meter and 1 kilometer datasets are derived through resampling the native 375 meter and 750 meter VIIRS resolutions, respectively, in the L2 input product. These bands are corrected for atmospheric conditions such as the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols.

The inputs to the surface reflectance algorithm are top-of-atmosphere reflectance for the VIIRS visible bands, VIIRS cloud mask, aerosol optical thickness and aerosol models, and atmospheric data obtained from the NOAA National Centers for Environmental Prediction (NCEP) reanalysis system. Along with the twelve reflectance bands are reflectance band quality, sensor and solar azimuth and zenith angles and observations layers. The reflectance layers from the VNP09GA data product are used as input data for many of the VIIRS land products. Validation at stage 1 is complete for VIIRS surface reflectance products.

Citation

PI Name: Eric Vermote

DOI: 10.5067/VIIRS/VNP09GA.001

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Characteristics

Collection

Characteristic	Description
Temporal Granularity	Daily
Temporal Extent	January 19, 2012 -- Present
Spatial Extent	Global
File Size	~100 MB
Coordinate System	Sinusoidal
Datum	N/A
File Format	HDF-EOS5
Geographic Dimensions	1200 km x 1200 km

Granule

Characteristic	Description
Number of Science Dataset (SDS) Layers	29
Columns/Rows	1200 x 1200 and 2400 x 2400
Pixel Size	1000 m and 500 m

Data Layer Characteristics

SDS Name	Description	Units	Data Type	Fill Value	Valid Range	Scale Factor
SensorZenith_1	Sensor Zenith Angle	Degree	16-bit signed integer	-32767	0 to 18000	0.01
SensorAzimuth_1	Sensor Azimuth Angle	Degree	16-bit signed integer	-32767	-18000 to 18000	0.01
SolarZenith_1	Solar Zenith Angle	Degree	16-bit signed integer	-32767	0 to 18000	0.01
SolarAzimuth_1	Solar Azimuth Angle	Degree	16-bit signed integer	-32767	-18000 to 18000	0.01
SurfReflect_M1_1	1 km Surface Reflectance Band M1	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M2_1	1 km Surface Reflectance Band M2	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M3_1	1 km Surface Reflectance Band M3	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M04_1	1 km Surface Reflectance Band M4	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M5_1	1 km Surface Reflectance Band M5	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M7_1	1 km Surface Reflectance Band M7	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M8_1	1 km Surface Reflectance Band M8	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M10_1	1 km Surface Reflectance Band M10	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
SurfReflect_M11_1	1 km Surface Reflectance Band M11	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
Land_QF1_1	Quality Flag 1	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF2_1	Quality Flag 2	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF3_1	Quality Flag 3	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF4_1	Quality Flag 4	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF5_1	Quality Flag 5	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF6_1	Quality Flag 6	Bit Field	8-bit unsigned integer	255	0 to 255	NA
Land_QF7_1	Quality Flag 7	Bit Field	8-bit unsigned integer	255	0 to 255	NA
num_observations_1km	Number of observations 1 km	None	8-bit signed integer	-1	0 to 127	NA
obscov_1km_1	Observations coverage 1 km	Percent	8-bit signed integer	-1	0 to 100	NA
orbit_pnt_1	Orbit Pointer	None	8-bit signed integer	-1	0 to 15	NA
I1_SurfRefl_1	500 m Surface Reflectance Band I1	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
I2_SurfRefl_1	500 m Surface Reflectance Band I2	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
I3_SurfRefl_1	500 m Surface Reflectance Band I3	Reflectance	16-bit signed integer	-28672	-100 to 16000	0.0001
num_observations_500m	Number of observations 500 m	None	8-bit signed integer	-1	0 to 127	NA
obscov_500m_1	Observation coverage 500 m	Percent	8-bit signed integer	-1	0 to 100	NA
iobs_res_1	Observation number	None	8-bit unsigned integer	255	0 to 254	NA

Product Quality

The bit field mappings for quality flag (QF) layers 1 - 7 are provided in the User Guide under Section 3.3, Tables 10 - 16.

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

Known Issues

Known issues for VIIRS Surface Reflectance data products can be found in Section 4.0 “Caveats and Known Problems” in 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