surveying iii (topographic and geodetic surveys) - Modern Prepper

does not fit into the network adjustment, the surveyor should use the float vector in the adjustments orcheck to make sure that the stations were occupied correctly.Table 5-4. Guidelines for Determining the Baseline Quality5-42. Postprocessing Criteria. Generally, postprocessing software will provide three solutions--atriple difference, a double-difference fixed solution, and a double-difference float solution. In additionto the relative dilution of precision (RDOP) as a measurement of the quality of data reduction, twomethods that can be used to gauge the success of an observation session (based on data processing doneby a differencing process) are RMS and repeatability.a. An RMS is a measurement (in units of cycles or meters) of the quality of the observation datacollected during a particular time period. RMS is dependent on the line length, the observation strength,the ionosphere, the troposphere, and multipath effects. In general, the longer the line and the moresignal interference by the ionosphere, the troposphere, multipath effects, and other electronic gear, thehigher the RMS. A good RMS factor (between 0.01 and 0.2 cycles) may not always indicate goodresults but is one indication to be taken into account. RMS can generally be used to judge the quality ofthe data used in the postprocessing and the quality of the postprocessed baseline vector.b. Redundant lines should agree to the level of accuracy that GPS is capable of measuring. Forexample, if GPS can measure a 10-kilometer baseline to 1 centimeter 1 ppm, the expected ratio ofmisclosure would be:5-37 EN0593