VIIRS Nighttime Lights Creating the Next Generation of Global Remotely-Sensed Nighttime Lights...
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VIIRS Nighttime Lights Creating the Next Generation of Global Remotely-Sensed Nighttime Lights Products From VIIRS Day/Night Band (DNB) Data Chris Elvidge Earth Observation Group (EOG) NOAA National Centers for Environmental Information (NCEI), USA [email protected] Kimberly Baugh, Mikhail Zhizhin, Feng-Chi Hsu, Tilottama Ghosh CIRES - University of Colorado, USA
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VIIRS Day-Night Band vs DMSP-OLS Quantization: DNB is 14 bit versus 6 bit for OLS. Dynamic Range: Due to limited dynamic range, OLS data saturate on bright lights in operational data collections. Lower Detection Limits: DNB can detect dimmer lighting than OLS. Quantitative: DNB is calibrated, the OLS visible band has no in-flight calibration. Multispectral: VIIRS has additional spectral bands to discriminate combustion sources from lights and to characterize the optical thickness of clouds.
Transcript of VIIRS Nighttime Lights Creating the Next Generation of Global Remotely-Sensed Nighttime Lights...
VIIRS Nighttime LightsCreating the Next Generation of Global
Remotely-Sensed Nighttime Lights Products From VIIRS Day/Night Band
(DNB) DataChris Elvidge
Earth Observation Group (EOG)NOAA National Centers for Environmental Information (NCEI), USA
Kimberly Baugh, Mikhail Zhizhin, Feng-Chi Hsu, Tilottama GhoshCIRES - University of Colorado, USA
Nighttime Lights Composites(Historical OLS Products)
The EOG Group at NCEI has a long history of making global annual nighttime lights composite products using DMSP-OLS data.
http://www.ngdc.noaa.gov/eog/dmsp/downloadV4composites.html
VIIRS Day-Night Band vs DMSP-OLS• Quantization: DNB is 14 bit versus 6 bit for OLS.• Dynamic Range: Due to limited dynamic range, OLS
data saturate on bright lights in operational data collections.• Lower Detection Limits: DNB can detect dimmer
lighting than OLS.• Quantitative: DNB is calibrated, the OLS visible band
has no in-flight calibration.• Multispectral: VIIRS has additional spectral bands to
discriminate combustion sources from lights and to characterize the optical thickness of clouds.
VIIRS Nighttime Lights Composite – 2015/01
Still has aurora, fires and background noise
VIIRS Nighttime Lights Composite
October 2014
Hong Kong
Current Status • A time series of 18 monthly DNB cloud-free composites are available at:
http://www.ngdc.noaa.gov/eog/viirs/download_monthly.html• Core algorithms have been developed for filtering of:• Lightning• Fires• Blurry lights • Background noise
• 18,000+ gas flares have been identified using IR channel data (Nightfire).• In the coming months we will work on producing a clean nighttime
lights product for 2015
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Applications for VIIRS Nighttime Lights
• Spatial definition of human settlements and areas with built infrastructure• Measuring growth rates in built infrastructure• Spatial extent of electrification• Power grid stability analyses• Power outage detection• Estimating the density of constructed surfaces• Modeling habitat fragmentation• Light pollution studies• Spatial modeling of economic indices
• Gridded GDP• Poverty mapping
• Urban metabolism analyses• Spatial modeling of fossil fuel carbon emissions, water consumption, waste water
production, …
All of these applications work best with a cleaned NTL product, with fires, flares & noise removed
