A Comprehensive Guide to Using TerraMatch
The Convert Time Stamps feature can be employed to transform the format of time stamps. A range of conversions are supported, including GPS seconds-of-week to GPS standard time, GPS time to GPS standard time, GPS seconds-of-day to GPS seconds-of-week, Unix time to GPS standard time, UTC seconds-of-day to GPS standard time, and UTC seconds-of-week to GPS standard time. Such conversions may be necessary when a different time stamp format is utilized for trajectories than has been used for tie lines and point cloud data. It is imperative that tie line time stamps match those of the trajectories and point cloud data.
To utilize the Convert Time Stamps feature, choose the Convert Time Stamps command from the Tools pulldown menu. This will prompt the Convert Tie Line Time dialog box to appear. Next, define the required settings and click OK. This will transform the tie line time stamps to the new format. It is essential to save the tie line file to ensure the modification is permanent.
The Method setting is used to select the preferred computation method for modifying time stamps. This can include the source and target system, which converts from one time format to another. Additionally, the Multiply and Add Constant option allows for a constant value to be multiplied by or added to existing time stamps.
The current format for time stamping the trajectory positions, which is only operational when the Method is designated as Source and target system, is in its original configuration.
The time stamp format will be adjusted to the targeted value if Method is set to Source and target system.
The date on which the data was obtained and the tie lines were derived is referred to as the Survey date. The format for this date is in dd/mm/yyyy (day/month/year), and it is only available for conversions from UTC seconds-of-day/week or GPS seconds-of-week to GPS time or GPS standard time.
When the Method is set to Multiply and add constant, the current time stamps are multiplied by a specific factor and a constant value is added to these stamps.
For conversions from UTC seconds-of-day time stamps to any GPS time format, an extra value is added to the GPS time stamps. Leap seconds are used as a reference to determine GPS time's advance over UTC time.
Moreover, if Method is set to Multiply and add constant, an added value is appended to the current time stamps.
Tie Line Figures
If the time stamps correspond with both the trajectories and the tie lines, the line numbers for the tie lines can be deduced from TerraScan's loaded trajectories. This feature is only effective when it is turned on.
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