7.1 Shift and drift parameters
A GPS data file has to include for every photo at least: event number, GPS-time, coordinates and optionally accuracy (three-dimensional). The event number should be identical with the photo name. In case of missing accuracy, the accuracy indication from the line above will be used. If there is no accuracy in the first line, 1.0 will be used. If there aren’t any accuracy indications at all, their control will be effected exclusively by the value from the FILE statement (see Section 5.3). If the time is missing, a constant time interval between the photos is assumed.
# LINE statement: # reference time (optionally) # # Data lines: # Event_no. time X Y Z [ precision ] # where precision = sqrt ( sx * sx + sy * sy + sz * sz) # LINE 2000 111111 159451. 33 159250.007591 10600094.0424 4239688.1005 1401.4480 0.0800 34 159282.853279 10598065.4247 4239615.4024 1400.6817 0.0800 35 159296.815497 10597199.4493 4239602.5454 1398.4477 0.0800 36 159310.787167 10596332.0504 4239600.0224 1396.6560 0.0800 : : : : : : LINE 3000 111111 160214. 60 160053.155461 10576791.5050 4238164.5835 1379.1645 0.0800 61 160074.067421 10578094.3731 4238178.5336 1378.4429 0.0800 62 160087.609837 10578927.7235 4238197.9830 1382.6156 0.0800 63 160101.284775 10579778.3434 4238213.7647 1372.2585 0.0800 : : : : : : : : : : : : |
Example for a GPS data file |
When all phase positions are solved correctly already in the GPS pre-processing, this file does not need any further data. The transformation into the control point system is then – and only then – effected with the 7-parameter-transformation, activated with the GTRA statement in the GEO INPUT file.