Data in GSadjust are organized in a hierarchical tree. At the top-most level is the Campaign, which contains all of the data in a project, typically from a particular field area. The user does not generally interact with the Campaign object. Each Campaign has one or more surveys, which represent all of the data combined in a network adjustment. If more than one survey is present, gravity change over time can be calculated. Each survey has one or more loops; the drift correction is specified on a per-loop basis. Each loop has two or more (station) occupations. A station may be occupied one or more times in a Loop. Finally, each occupation has one or more samples. Typically during a relative-gravity measurement several samples are taken (often at a 5 second interval for the Burris meter, or 90 second interval for Scintrex meters).
The content of the Drift tab is determined by the currently selected Loop, indicated by bold type. Similarly, the content of the Network Adjustment tab is determined by the currently selected Survey, also in bold. The selected Loop or Survey is changed by double-clicking on the Loop/Survey name.
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