STAR*NET V6 - Circe

Chapter 5 Preparing Input Data
The following lines illustrate a variety of 2D and 3D Geodetic Positions entries:
Example 1: (2D Data)
P DIABLO 34-22-44.55436 120-23-41.67581
Station “DIABLO” has the given latitude and longitude values. No standard error values
or fixity codes are entered, so the 2D grid coordinates created by these geodetic positions
will be assumed completely free to be adjusted. Note that the longitude is entered as a
positive value. If the “Positive West Longitudes” sign convention preference in the
project options is selected, this longitude means west of Greenwich. If the “Negative
West Longitudes” preference is selected, this longitude means east of Greenwich.
Example 2: (3D Data)
P 2001 33-45-22.3665 -14-24-55.6658 733.25 ! ! !
Station “2001” has latitude and longitude values given plus an elevation. Since all items
are entered as fixed, all the resulting 3D coordinates (grid coordinates and elevation) will
be fixed in the adjustment. Note the longitude is negative. Its meaning will be interpreted
based on the “Longitude Sign Convention” project option setting mentioned above.
Example 3:
P X3 34-22-44.554 120-23-41.671 733.25 0.02 0.015 ! ‘GPS 073
The resulting north and east grid coordinates created by this entry will be assigned
standard errors of 0.020 and 0.015 respectively. The elevation will be held fixed.
The “E” Code: Elevation for a Station
This entry is for 3D data only:
E Station Elevation [Std Error]
This data type allows you to assign an elevation to a station. The elevation may be fixed,
free or partially fixed depending on what is entered for the standard error field.
The “E” data type is useful when you wish to specify an elevation, but leave the
horizontal coordinates to be determined some other way, either by manual entry or by
letting the program calculate them. For example, you can enter a list of fixed benchmark
elevations, but leave the northings and eastings to be calculated by the program.
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