 |
| Titel |
Accuracy of velocities from repeated GPS measurements |
| VerfasserIn |
V. Akarsu, D. U. Sanli, E. Arslan |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2015-04-21), S.875-884 |
| Datensatznummer |
250119426
|
| Publikation (Nr.) |
 copernicus.org/nhess-15-875-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Today repeated GPS measurements are still in use, because we cannot always
employ GPS permanent stations due to a variety of limitations. One
area of study that uses velocities/deformation rates from repeated GPS
measurements is the monitoring of crustal motion. This paper discusses the
quality of the velocities derived using repeated GPS measurements for the
aim of monitoring crustal motion. From a global network of International GNSS Service (IGS) stations, we
processed GPS measurements repeated monthly and annually spanning nearly
15 years and estimated GPS velocities for GPS baseline components latitude,
longitude and ellipsoidal height. We used web-based GIPSY for the
processing. Assuming true deformation rates can only be determined from the
solutions of 24 h observation sessions, we evaluated the accuracy of the
deformation rates from 8 and 12 h sessions. We used statistical hypothesis
testing to assess the velocities derived from short observation sessions. In
addition, as an alternative control method we checked the accuracy of GPS
solutions from short observation sessions against those of 24 h sessions
referring to statistical criteria that measure the accuracy of regression
models. Results indicate that the velocities of the vertical component are
completely affected when repeated GPS measurements are used. The results
also reveal that only about 30% of the 8 h solutions and about 40% of
12 h solutions for the horizontal coordinates are acceptable for velocity
estimation. The situation is much worse for the vertical component in which
none of the solutions from campaign measurements are acceptable for obtaining
reliable deformation rates. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|