e-Data  —  Topcon FC6/GTS700

This option processes Topcon FC6 and GTS700 files derived from data collector or total station data.

The Topcon FC6 / GTS700 window is displayed when this format is selected in the e-Data option of the Survey Menu.

Figure 1: Topcon FC6/GTS700 option

More Info:

When Geoida is running, details of the purpose and use of each control in this window will be displayed in the bottom panel when the mouse is passed over any active object.

If the Topcon FC6-GTS700 data contains traverse, network or resection observations as well as radiation observations for detail pickup, the file should first be processed using the All data or Traverse/network modes so that the control stations may be adjusted before processing the radiation observations. As with any of the other similar options that process traverse or network data, the observations detected in the Topcon FC6-GTS700 file will be written to an Extract file which may be edited if necessary, before final processing and adjustment (see Extract file for more information). Following computation and adjustment of the traverse/network framework in this manner, the file may then be processed again using the Radiations only mode to compute the radiated points.

Many of the conventions used by Geoida during data processing apply equally to other options as well as to this option. Refer to the section Meaning, sorting and correction of control, traverse and network observations in the Extract file topic for information regarding use of the Mean control observations check-box option.

Refer also to Survey Data Processing for a list of topics with further general information and to Traverse and Network Processing for information specific to the traverse or network data reduction procedure.


Geoida recognises most standard FC6-GTS700 file record codes - refer to the Topcon FC6 or GTS700 reference manuals for details of the codes. If a record type is recognised but is not currently used in processing, the message

*** Topcon GTS700 - Un-handled record type: XX - please report

will be displayed. If an unrecognised record type is found, the following message will be displayed:

*** Unknown record type XX (not processed)

Note that any settings for the CORR (sea-level and curvature/refraction corrections) and SCALE (projection scale factor) records are not used since these are incorporated into the processing according to job and option settings.

When processing using the All data or Traverse/network modes, Geoida searches for sets of observation rounds to multiple points. If observation sets can be identified by blocks of matching BS+SD/HD/HV and FS+SD/HD/HV records, these will be used for preference. But if the FC6-GTS700 file contains only single observations identified by SS+SD/HD/HV records, Geoida will analyse the data to attempt to separate single radiated (pickup) observations from traverse or control network observations, compiling and meaning any repeated observations to the same points and observations on both faces. For this process to be successful, the observations are expected to be in an orderly and logical sequence. For further details of this process, refer to the section Total Station derived data under Survey Options - General Notes.

Finally (in All data mode) and in Radiations mode, Geoida will analyse the data for single SS (Side-Shot) pickup observations and (in All data mode) will compute these observations only after traverse or control observations have been separately identified and completely processed.

Alpha-numeric point IDs - Many instruments and the Topcon FC6-GTS700 file translation process support alpha-numeric point IDs. Since Geoida identifies points by number only, a cross-reference may be created whenever a point is read having an alpha-numeric ID. The Alpha-Numeric ID Cross-Reference window is opened where a point number may be entered (for a point not already existing) or selected from a list of existing points - for more information, refer to this topic.

For additional information, see the heading Processing control survey data under the Total Station derived data heading in the Survey Options - General Notes topic.

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