Robust probabilities of detection and quantification uncertainty for aerial methane detection: Examples for three airborne technologies

• Published in: Remote sensing of environment Vol. 288; p. 113499
• Main Authors: Conrad, Bradley M., Tyner, David R., Johnson, Matthew R.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.04.2023
• Subjects: Aerial detection sensitivity; Alt-FEMP; AMEL; Fugitive emissions; Measurement-based inventories; Methane; Monitoring, reporting, and verification; MRV; Oil and gas; Quantification uncertainty; Remote sensing; Methane; MRV; Monitoring, reporting, and verification; Quantification uncertainty; Measurement-based inventories; Oil and gas; Alt-FEMP; AMEL; Remote sensing; Aerial detection sensitivity; Fugitive emissions
• ISSN: 0034-4257; 1879-0704
• DOI: 10.1016/j.rse.2023.113499

Thorough characterization of probabilities of detection (POD) and quantification uncertainties is fundamentally important to understand the place of aerial measurement technologies in alternative means of emission limitation (AMEL) or alternate fugitive emissions management programs (Alt-FEMP); monitoring, reporting, and verification (MRV) efforts; and surveys designed to support measurement-based emissions inventories and mitigation tracking. This paper presents a robust framework for deriving continuous probability of detection functions and quantification uncertainty models for example aerial measurement techniques based on controlled release data. Using extensive fully- and semi-blinded controlled release experiments to test Bridger Photonics Inc.'s Gas Mapping LiDAR (GML)™, as well as available semi- and non-blinded controlled release data for Kairos LeakSurveyor™ and NASA/JPL AVIRIS-NG technologies, robust POD functions are derived that enable calculation of detection probability for any given source rate, wind speed, and flight altitude. Uncertainty models are separately developed that independently address measurement bias, bias variability, and measurement precision, allowing for a distribution of the true source rate to be directly calculated from the source rate estimated by the technology. Derived results demonstrate the potential of all three technologies in methane detection and mitigation, and the developed methodology can be readily applied to characterize other techniques or update POD and uncertainty models following future controlled release experiments. Finally, the analyzed results also demonstrate the importance of using controlled release data from a range of sites and times to avoid underestimating measurement uncertainties. [Display omitted] •Generalized method presented to derive aerial methane detection sensitivity.•Generalized error model also developed to derive quantification uncertainty.•Continuous probability of detection functions derived for three aerial technologies.•Results give detection probability for any source, wind, and flight altitude.•Enables use of aerial data in MRV, AMEL/Alt-FEMP, and measurement-based inventories.