Comparison of contemporaneous measurements of 84 distances in the range of 10 to 50 km by both GPS and Geodolite (an electro-optical distance measuring instrument) indicates that the Geodolite measurements are systematically longer by 0.283 ± 0.093 ppm (parts per million) of the measured distance. Quoted uncertainty is one standard deviation. This amounts to 11.3 ± 3.7 mm at 40 km, which is near the maximum Geodolite range. The source of the systematic difference has not been identified.
AGU Index Terms: 1209 Crustal movements; 1204 Control surveys
Keywords/Free Terms: Distance measurement, Geodolite, GPS.
JGR-Solid Earth 96JB02288
Vol. 101
, No. B11
, p. 25,547