Specify Gravity Anomaly

In GM-SYS Profile Modelling, a "Station" is a location at which an anomaly component is calculated and optionally, was measured. Use the Specify Gravity Anomaly dialog to define the locations of gravity calculations and observations, as well as the background (reduction) density appropriate to your observed data. This must be correctly defined in order to calculate the model response properly.

If Gravity Gradient calculations are enabled, you may also import observed gravity gradient components measured at the same locations.

In order for GM-SYS Profile Modelling to calculate a response at a location, the X, Y, and Z coordinates of the station must be specified. However, observed values are not required. You may import data from a Geosoft Database line, from an ASCII file, or you may create equally-spaced calculation stations with no observed values. In all cases, specifying new gravity stations will completely replace any existing gravity stations (including gradients).

Select Import from database line if you have X, Y, Elevation, and optionally Observed Gravity Anomaly channels in a Geosoft Database line. If you have the four data fields in a flat ASCII file, select Import from text file. Select Create equally-spaced stations if you do have observations, but wish to calculate the response of the model. Selecting a radio button will launch a separate dialog specific to your selection. In each of these cases, you may also import observed gravity gradient components if Magnetic Gradient calculations are enabled.

Specify a background density if your observed data have been corrected or reduced. For instance, use the Bouguer reduction density for Bouguer Anomaly data.