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Sample: Methane emission from hydroelectic facility under construction in Africa

  • Site name: Lom Pangar Dam, Cameroon
  • Site coordinates: 5.3834 N, 13.5011 E
  • Observation timestamp: 2017-04-20 08:45:32 UTC
  • Measurement duration: 20 s
  • Available products:
    • Radiance image – Imagery acquired in the SWIR band providing, per pixel, top-of-the-atmosphere radiance, in a 1600-1700 nm band, with spatial resolution < 50 m.
    • Abundance dataset – Array of (a) per-pixel column density (mol/m2) for methane, and (b) per-pixel measurement error expressed as a standard deviation, with pixel spatial resolution < 50 m.
    • Concentration map – Methane plume visualization combining the column density and surface reflectance in a high readability pseudocolor map.
  • Delivery format: GEOTIFF
  • Delivery method: Secure Web portal – URL, username and password provided by GHGSat
  • Legal conditions: Products are licensed to end-users; license terms and conditions are provided with samples
  • Costs: GHGSat offers samples at no cost to end-users; end-users assume their own costs for evaluating samples.

The concentration map (i.e. “heat map” of the retrieved methane concentrations) for the observation is shown below.

The Lom Pangar Dam is currently under construction. The reservoir was flooded in 2016. When fully operational, it will generate 30MW of electricity and will help provide more reliable power to over 5 million people. Hydroelectric facilities in tropical regions such as Lom Pangar are believed to be significant sources of methane due to the submerged soil and decomposing organic matter in the reservoir; however, accurate measurements remain a challenge.