5.6 Reference Data Sets5.6 Reference Data Sets
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These data sets are used to provide direct constraints on the modelling preformed within Noddy. The only formats currently supported are the Noddy .mag and .grv formats, ER Mapper .ers and GEOSOFT .gxf formats , however there is also provided a conversion tool (Import->ASCII in the Tools menu) to allow other conversions. Once loaded a reference image may be used in one of three ways:
a) As a source of inspiration for further modelling, simply by looking at the loaded image, or drawing profiles across it, or calculating the vertical derivative images.
b) In the structural definition windows the preview window provides Gravity Difference and Magnetics Difference menu items for calculating the difference between actaul and modelled data, and
c) High resolution difference images may be calculated using the Difference with Reference-> Gravity or Difference with Difference Reference-> Magnetics options from the Geophysics menu.