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VIIRS Data Evaluation Over Thailand and Japan. February 13, 2012 Chair, Chris Elvidge NOAA-NGDC [email protected] VIIRS – Visible Infrared Radiometer Suite. 1."VIIRS Overview, Status and Data Access" - Chris Elvidge, NOAA-USA

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Viirs data evaluation over thailand and japan

VIIRS Data Evaluation Over Thailand and Japan

February 13, 2012

Chair, Chris Elvidge

NOAA-NGDC

[email protected]


Viirs visible infrared radiometer suite

VIIRS – Visible Infrared Radiometer Suite

1."VIIRS Overview, Status and Data Access" - Chris Elvidge, NOAA-USA

2."Comparsion of VIIRS and DMSP Nighttime Lights of Thailand" - Chris Elvidge, NOAA-USA

3."VIIRS Observations of Fires in Thailand" - Veerachai Tanpipat, Thailand

4."VIIRS Data of Japan" - Izumi Nagatani, MAFF-Japan


Viirs visible infrared radiometer suite1

VIIRS – Visible Infrared Radiometer Suite

Launched October 28, 2011 on the NPP satellite

NPP is the first in a series of planned weather & science satellites planned by the NASA – NOAA Joint Polar Satellite System (JPSS)

16 moderate resolution (~1 km) spectral bands

5 imaging bands (~400 m)

Low light imaging band (~750 m)

On-board calibration

3000 km swath

Polar orbit

1:30 and 13:30 overpasses

Daily and nightly global coverage

IR bands turned on January 18, 2012

NGDC serves as one of two long term archive sites for VIIRS data and products

HDF5 file format


Improvements Coming for Nighttime Lights

VIIRS vs OLS Basra, Iraq, December 5, 2012

  • 14 bit quantization

  • 750 m GSD

  • ~750 m GIFOV

  • 1:30 am overpass

  • Radiometric calibration

  • No saturation

  • 6 bit quantization

  • 2.7 km GSD

  • 5 km+ GIFOV

  • 8:00 pm overpass

  • No in-flight calibration

  • Saturation in urban center in operational data collections


Transect Across a Gas Flare

VIIRS vs OLS Basra, Iraq, December 5, 2012

  • 14 bit quantization

  • 750 m GSD

  • ~750 m GIFOV

  • 1:30 am overpass

  • Radiometric calibration

  • No saturation

  • 6 bit quantization

  • 2.7 km GSD

  • 5 km+ GIFOV

  • 8:00 pm overpass

  • No in-flight calibration

  • Saturation in urban center in operational data collections


VIIRS DNB Issues and Proposed Solutions

  • Bias in geolocation. Needs to be characterized to correct.

  • Geolocation lacks terrain correction. Use terrain corrected geolocation files from “I” bands.

  • Offsets were to be taken from new moon observation of deep ocean. However, derivation of the offsets complicated by scanline repeat cycle and detection of clouds by skyglow. Cloud-free compositing and synchronization of scanlines will be required to derive the best offsets.


Bias in DNB Geolocation


VIIRS Data Access

  • From the archive (www.class.noaa.gov). Open access anticipate in the next couple of months.

  • From direct readout stations. The direct broadcast service will start later this year.

  • From value added processors. NGDC will provide NRT and temporal composites of the DNB data. There will be other discipline based value added processors.


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