“These are the radiancies of the perfected vision that sees the good and step by step moves nearer what it sees.”
- Dante Alighieri, The Paradiso - 1307
VIIRS is unique in the recording of near-infrared and short-wave infrared data at night. This includes the M7, M8, and M10 spectral bands. Nighttime M11 data became available in December 2017. With sunlight eliminated, combustion sources are readily detected, particularly in the M10 and M11 bands. The recorded signal can be fully attributed to the combustion source. In our analysis we use data from all of the VIIRS bands collecting data at night. The data from M10, M11, M12 and M13 bands are used to detect combustion sources. To eliminate noise, confirmation is sought in the Day/Night Band (DNB), M7 and M8. Plank curve fitting is performed to estimate the temperature of background and hot sources.
Nightly VNF data are available in CSV and KMZ format. For KMZ files, it is recommended to use Google Earth to browse the content.
he CSV files are compressed in GZIP format. Follow instructions below to decompress them.
Use 7-zip to unpack .gz file.
Double click on the .gz file to unpack. Or use the command
gunzip <file.gz> in command line interface (CLI) to un-compress and extract the GeoTIFF files.
Nightly Data is available in Download section.
There are two types of VNF CSV, i.e. complete and EZ. VNF CSV in EZ type, for example v30-ez, has a subset of columns which are useful for most users.
CSV Readme (v30-ez) is available HERE.
CSV Readme (v21) is available HERE.
CSV Readme (v21-ez) is available HERE.
Each VNF detection is given a placemark according to its temperature.
|400K < T < 1000K|
|1000K < T < 1200K|
|1200K < T < 1400K|
|1400K < T < 1600K|
|1600K < T < 2500K|
|2500K < T|
Currently EOG is producing VNF V30 with imagery from both NPP and NOAA-20 (J01) satellites.
|V21||EZ CSV||Open Access|
|V30||CSV||Restricted. Contact EOG for details.|
|V30||EZ CSV||Open Access|
VIIRS Nightfire algorithm had experience multiple upgrades. Currently we are archiving V2.1 derived from two sources, i.e. NOAA GRAVITE and NOAA CLASS. The operational one is V3.0.
EOG have developed a set of methods for the global survey of natural gas flaring using VIIRS data. The original development was conducted with data from 2012. This has now been expanded to 2019.
Prior to VIIRS, EOG had used DMSP-OLS to estimate the global gas flaring volume.
When using the data please credit the product generation to the Earth Observation Group, Payne Institute for Public Policy, with proper citations as below.