A global image of the VJ109CMG surface reflectance band M5-M4-M3 data from September 17, 2018.View full-size image
The Visible Infrared Imaging Radiometer Suite (VIIRS) daily surface reflectance Climate Modeling Grid (VJ109CMG) Version 2 product provides an estimate of land surface reflectance from the NOAA-20 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.
More details can be found in this VIIRS Land V2 Changes document.
Validation at stage 3 has been achieved for the VIIRS Land Surface Reflectance product suite. Visit VIIRS Land Product Quality Assessment Product Maturity for information on product maturity status.
|File Size||~850 MB|
|Temporal Extent||2018-01-01 to Present|
|Coordinate System||Geographic Latitude and Longitude|
|Number of Science Dataset (SDS) Layers||32|
|Columns/Rows||7200 x 3600|
|Pixel Size||5600 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
|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|
|NPix_375m_Averaged||Number 375 m pixels averaged||N/A||16-bit unsigned integer||0||N/A||1 to 800||N/A|
|NPix_750m_Averaged||Number 750 m pixels averaged||N/A||16-bit unsigned integer||0||N/A||1 to 200||N/A|
|Number_Mapping_1||Number Mapping 1 Adjacent cloud/snow||N/A||32-bit unsigned integer||0||N/A||1 to 14000000||N/A|
|Number_Mapping_2||Number Mapping 2 cloud/cloud shadow||N/A||32-bit unsigned integer||0||N/A||1 to 14000000||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|
|State_QA||CMG State Quality Assurance (QA) flags||Bit Field||16-bit signed integer||0||N/A||1 to 65535||N/A|
|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||Surface Reflectance CMG Band M1||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M2||Surface Reflectance CMG Band M2||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M3||Surface Reflectance CMG Band M3||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M4||Surface Reflectance CMG Band M4||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M5||Surface Reflectance CMG Band M5||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M7||Surface Reflectance CMG Band M7||N/A||16-bit unsigned integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M8||Surface Reflectance CMG Band M8||N/A||16-bit unsigned integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M10||Surface Reflectance CMG Band M10||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_M11||Surface Reflectance CMG Band M11||N/A||16-bit signed integer||-28672||N/A||-100 to 16000||0.0001|
|SurfReflect_QF1||Quality Flag 1||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|SurfReflect_QF2||Quality Flag 2||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|SurfReflect_QF3||Quality Flag 3||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|SurfReflect_QF4||Quality Flag 4||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|SurfReflect_QF5||Quality Flag 5||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|SurfReflect_QF6||Quality Flag 6||Bit Field||8-bit unsigned integer||255||N/A||0 to 254||N/A|
The bit field mappings for quality flag (QF) layers 1 through 6 and number mapping are provided in Section 3.3 of the User Guide.
The quality flag (QF) layers are stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the quality layer.
Quality assurance information should be considered when determining the usability of data for a particular science application. The ArcGIS MODIS-VIIRS Python Toolbox contains tools capable of decoding quality data layers while producing thematic quality raster files for each quality attribute.