Add Data to an Existing GM-SYS Model

The GMSANOM GX will extract magnetic and/or gravity data and station elevations from grids for inclusion into an existing (closed) GM‑SYS model. Existing files are overwritten.

Add Data to an Existing GM-SYS Model dialog options

Existing model name	The name of the GM-SYS Profile Modelling model. Script Parameter: GMSANOM.MODELNAME
Magnetic grid	Total magnetic field grid (nT). Script Parameter: GMSANOM.MAGAGRD
Magnetic elevation grid	Magnetic field observation elevation grid. (Must be in the "Vertical Distance units" specified below). Script Parameter: GMSANOM.MAGZGRD
OR constant magnetic elevation	Constant magnetic observation elevations; only used if no grid is specified for the magnetic elevations. Either Bouguer or free-air anomaly grid (mGal). Script Parameter: GMSANOM.MAGZCONST
Gravity grid	Gravity grid (milligals), either Bouguer anomaly or free-air anomaly. Script Parameter: GMSANOM.GRVGRD
Gravity elevation grid	Gravity observation elevation grid (+ up). (Must be in the "Vertical Distance units" specified below). Script Parameter: GMSANOM.GRVZGRD
OR constant gravity elevation	Constant gravity observation elevation; only used if no grid is specified for the gravity observation elevations. Defaults to Observation Elevation from current 3D model. Script Parameter: GMSANOM.GRVZCONST
Minimum X (model coords.)	The point at which the initial data value is extracted. (Must be in the "Horizontal Distance units" specified below). Script Parameter: GMSANOM.XMIN
Sample interval	Spacing between extracted points. (Must be in the "Horizontal Distance units" specified below). Script Parameter: GMSANOM.DX
Number of points in profile	The number of points to extract in the model profile. There cannot be more than 1,000 points in the Standard version of GM‑SYS. The Hi-Res version allows 16,000. Script Parameter: GMSANOM.NX
Vertical distance units	Choose the vertical distance units from the list. All elevations must be expressed in this unit. Script Parameter: GMSANOM.VUNITSNAME, GMSANOM.VUNITSFAC
Horizontal distance units	Choose the horizontal distance units from the list. The "Minimum X" and "Sample Interval" (see above) must be expressed in this unit. Script Parameters: GMSANOM.HUNITSNAME, GMSANOM.HUNITSFAC

Application Notes

If the grids used have projections associated with them, gmsanom uses them: otherwise it assumes the units specified by the Horizontal Distance unit. If the model does not have projection information in the .ECS file, gmsanom assumes that projection information found in the first grid is the same as the model and writes that projection information into the .ECS file.