Airborne Gravity

Airborne Gravity Guide

Airborne gravity starts with the advances in instrumentation and navigation technology that have brought airborne gravity to a cost effective data acquisition method. The measurement of the Earth’s gravitational field strength using instruments aboard an aircraft today have reached an unprecedented 1-2 milligal level of accuracy. This means a scientist can use an aircraft to acquire viable data to map small gravity field changes that are 1 million times smaller than the 1 g° (standard gravity value). This capability allows them to make detail maps of buried resources and enabling high-precision geodetic applications.

Airborne Gravity was developed primarily for petroleum exploration, where it is an economical alternative to ground and shipborne surveys.  It also has exciting application in regional geophysics, mineral exploration and geodesy. The learning objective is taking you through an introduction of the science starting with types of instrumentation to survey design, data processing and data quality control.

See sections below

Guide: GS 102 – Standard Gravity Corrections Applied to Airborne Gravity

There are several standard corrections that are applied to any gravity data set. The module starts with  a summary on what is a gravity system and a description of the two main types: absolute and relative. We review how gravity can measure density and/or structural variations. That leads you the main objective of the module which is to discuss the different standard gravity corrections that are applied to all gravity data sets: the theoretical ellipsoidal gravity (latitude correction), atmospheric effect, height (Free Air) correction, and terrain effects (Bouguer correction). And continue through the additional gravity corrections that are applied specifically to airborne surveys: the Eötvös correction and removing of the aircraft motion.


Guide: GS 201 – Airborne Gravity Quality Control

What should quality control procedures do? They should ultimately check for errors or conditions that are known to cause deterioration in the data quality. They should identify any processing errors, and quantify noise levels and resolution to ensure they meet contract specifications. This module delineates quality control techniques. Note that each gravity system will have its own set of quality control parameter guidelines, and the quality control check used must be specific to the gravity system being used.

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