Geotechnology uses software developed specifically for the task of processing high resolution gravity datasets, including the high precision removal of both terrain and building effects.  Using many years of experience the significance of road construction and shallow fill deposits can be recognised and removed from the data.  Interpretation relies heavily upon past experience and few can offer the experience offered by Geotechnology.  Using a number of analytical tools, 2D, 3D and 4D gravity data can be analysed to provide both constrained and unconstrained solutions to the gravity plans produced during the survey.  As a practice we routinely receive follow-up ground truth investigation results so that the gravity models can be updated and constrained.