b'Environmental geophysics all question our data all the time\x08 Wholine, but in those dark old days we didStudies\x08 PhD Thesis, University of collected the data and when?, for example\x08not have GIS and it was only in the fieldQueensland\x08I have seen geophysical operators whothat the relationship was obvious\x08 Anderson-Mayes, A\x08, 2002\x08 Strategies to consistently collected noisier data thanimprove information extraction from others\x08 Was this survey done at the rightEach philosophy has advantages andmultivariate geophysical data suites, time or are there spherics, turbulence ordisadvantages and ideally we shouldExploration Geophysics 33(2)\x08other factors that affect the data quality inhave a bet each way in our interpretation\x08Street, G\x08 J\x08, Pracilio, G\x08, Owers, M\x08, Triggs, the data? Were the survey specificationsIn natural systems it is important toD\x08, and Lane, R\x08, 1998\x08 National Dryland right for the purpose intended and has theremember the complexity behindSalinity program\x08 Airborne Geophysical data been processed in the best possiblethe system, and the simplicity of theSurveys to assist in planning for salinity way? What are the geological controls andanswer we are searching for throughcontrol 1. Willaura SALTMAP Surveycan we bring in other data to support ourthe interpretation\x08 How we approachInterpretation ReportJune 1998 (92 interpretation? an interpretation can greatly alter thepages, plus appendices and maps\x08), results\x08 From a rationalist point of view,unpublished report for National Gottlob Frege on the other handfailure to identify the objectives of theAirborne Geophysics Project, AGSO\x08believed in a mathematical logicinterpretation before starting will resultStreet, G\x08 J\x08, Pracilio, G\x08, Nallan approach to interpretation\x08 His approachin an ineffective interpretation\x08 However,Chakravatula, P\x08, Vukovich, D\x08, Harvey, was to eliminate any intuition or humanhaving a too narrow interpretation goalB\x08, Sattel, D\x08, Owers, M\x08, and Lane, element from the process\x08 If there is anybefore we start may alienate the trueR\x08, 1998\x08 National Dryland Salinity human element it should be evaluatedsolution from the interpretation\x08 program. Airborne Geophysical Surveys and presented separately as an axiom\x08to assist in planning for salinity control Thereafter the interpretation can beWhy am I rambling on about 2. Balfes Creek SALTMAP Survey - purely logical\x08 However, if we largelyinterpretation? It is because I heard aInterpretation Report - August 1998, ignore the human element and thequotation the other day on Anhs Brushunpublished report for National vagaries of nature plus the possibility ofwith Fame on ABC TV about art\x08 Art isAirborne Geophysics Project, AGSO\x08noise then we may end up missing vitalan artefact of something you made inPracilio, G\x08, Street, G\x08 J\x08, Nallan Chakravatula, information about our system\x08 Thus, Ithe time you had available\x08 It is neverP\x08, Nash, C\x08, Owers, M\x08, Triggs, D\x08, expect the answer to the question abovefinished\x08 It is never perfect\x08 The sameand Lane, R\x08, 1998\x08 National Dryland (why did Anne-Maries machine learningmay be said of interpretation\x08 Salinity program. Airborne Geophysical approach work so well in WA and not soSurveys to assist in planning for salinity well in the east?) is that in the south-westReferences and related reading control 3. Lake Toolibin SALTMAP Survey of Australia we knew the conditions wellInterpretation ReportDecember and thus could almost follow a FregeAnderson-Mayes, A\x08, 2000\x08 Enhancing1998 (110 pages, plus appendices and approach\x08 Elsewhere we were not soInterpretation of Multivariate Airbornemaps), unpublished report for National successful\x08 We had not evaluated ourGeophysical Data for Dryland SalinityAirborne Geophysics Project, AGSO\x08axiom properly and we needed a bit of Cartesian logic\x08Early in my mineral exploration career,Greg Street has a BSc (Hons) in geology (UNE, 1974) and an MSc in geophysics we tried to figure out why a hole that we(London, 1980)\x08 In 1983 following 10 years in mineral exploration he joined the had drilled into an anomaly at BrokenGeological Survey of WA where he worked on the application of geophysics for Hill Deep had intersected nothing ofenvironment\x08 This resulted in a joint project with Aerodata and the Department note\x08 Based on the drilling, the anomalyof Agriculture to develop an airborne electromagnetic system for land salinisation was clearly due to a broad shallowstudies\x08 From 1992 to 2000 he was Director of Environmental Services at World feature\x08 Based on the geophysicalGeoscience Corporation and part of teams that applied airborne geophysical data, modelled in the office (not bymethods for environmental applications in Australia and overseas\x08 For this me luckily) it looked to be 400 m deep\x08work Gregs team received two Western Australian and one National Landcare An expensive mistake\x08 A bit of PlatosAward\x08 Greg was recruited to Sandfire Resources as General Manager and ran experience and Descartes rationalismthe company up to the discovery of the DeGrussa Copper Deposit a multi-billion, means that mistake should not bedollar deposit\x08 He is a former senior lecturer in Environmental Geophysics at repeated (at least by any of us workingCurtin University\x08 Greg is a former secretary (1988) and president of the Australian on that project)\x08 Even then, maybeSociety of Exploration Geophysicists (ASEG) in 1989 and 2014 as well as the it would not have happened if therecipient of the inaugural Lindsay Ingall Memorial Award\x08 Greg is currently a interpreter looked at a topographic mapDirector of Loupe Geophysics, which has developed a new Electromagnetic and realised that there was a sequencesystem for shallow conductivity mapping\x08of similar anomalies following a creek APRIL 2021 PREVIEW 30'