Our experts also design and provide quality control for airborne, marine and land gravity and magnetic surveys – primarily for programs that we will ultimately interpret, so that we have the best data possible for our interpretation work. In this way, our experts work closely with your team to allow the geology and exploration objectives to inform the design of an optimal survey.Our QC is primarily done remotely from the field (though field visits can be performed as well, perhaps at survey startup and final completion) where we perform rigorous quality control assessments on the data (daily, weekly, etc., based on the frequency of data drops). This allows us to review the data as it is acquired, and confer with the field and data processing personnel to ensure we obtain the highest quality survey results, make recommendations for re-flights, determine chargeable km, and generally assure that all contract and safety specifications are met.
Typically, airborne gravity and particularly airborne gravity gradiometry surveys are not fully field-processed but require processing back at the contractor’s site. Accordingly, the need for full-time QC in the field has diminished over time. We find that a targeted remote QC effort achieves the very best data to be acquired, while helping to conserve the project budget by limiting unnecessary field visits.
Our QC role continues during the data processing phase, oftentimes with a visit to the data processing center to perform final QC and discuss and agree upon all client deliverables.
Following is one selected QC chart illustrating a noise summary for a magnetic survey, designed with tight specifications owing to the geological problem to be solved by the magnetic data. The high bars illustrate flight sorties that were flagged and subsequently re-flown. Standard figure of merit (FOM), fourth difference and similar tools are used during our analysis.