Comparison of Signalworks and BP processing and interpretation of ALF MkII survey data  

Authors / CoAuthors

Cowley, R.

Abstract

Airborne laser fluorosensor (ALF) data was acquired by BP in Australia between 1990 and 1991 and originally processed by BP immediately after acquisition. The data was reprocessed by Signalworks Pty Ltd in 2000 and 2001 with significant differences in the number of fluors picked and oil seepage distributions interpreted. A comparison of the data processing and interpretation techniques shows similar methods used by both companies. The main difference with the Signalworks interpretation is that a larger number of lower confidence fluors are used to determine the seepage distributions. Low signal to noise ratio (S/N) in the MkII ALF data used is the main cause of data analysis difficulties and differences between interpretations. This problem was greatly reduced in the MkIII system developed later which results in more consistent interpretations between companies. Another problem with ALF surveys covering very large areas is the pattern of background fluorescence / Raman area ratios (F/R) that can affect the pattern of picked fluors. Both BP and Signalworks use an averaging technique to determine the background F/R levels over the survey. The BP analysis has usually resulted in very few picked fluors and little information about seepage patterns. The Signalworks analysis has attempted to pick sufficient fluors to define seepage patterns but is affected by the low S/N and background F/R patterns.

Product Type

nonGeographicDataset

eCat Id

37769

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Keywords

• GA PublicationReport

( Theme )

• remote sensing

• AU

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_Internal

Publication Date

2001-01-01T00:00:00

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Australian Government Security ClassificationSystem    

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Creative Commons Attribution 4.0 International Licence    

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unknown

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geoscientificInformation

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Unknown

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[-40.0, -10.0, 110.0, 155.0]

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