Digital photogrammetry and kinematic GPS applied to the monitoring of Vulcano Island, Aeolian Arc, Italy

Citation
P. Baldi et al., Digital photogrammetry and kinematic GPS applied to the monitoring of Vulcano Island, Aeolian Arc, Italy, GEOPHYS J I, 142(3), 2000, pp. 801-811
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL JOURNAL INTERNATIONAL
ISSN journal
0956-540X → ACNP
Volume
142
Issue
3
Year of publication
2000
Pages
801 - 811
Database
ISI
SICI code
0956-540X(200009)142:3<801:DPAKGA>2.0.ZU;2-8
Abstract
Digital photogrammetry and kinematic global positioning system (GPS) techni ques are investigated and compared over a volcanic area as operational appr oaches to map the topography and monitor surface displacements. The use of terrestrial and airborne GPS to support the photogrammetric survey allowed for operational and processing time reduction without loss of accuracy. A d igital elevation model (DEM) is obtained from the processing of the high-re solution digital imagery survey, which provides detailed information over a large area. The internal accuracy of the derived DEM has been verified by the comparison of two sets of data obtained from imagery acquired in differ ent epochs; the observed root-mean-square error of residuals ranges from a few centimetres to 15 cm depending on the morphological features. Kinematic and pseudo-kinematic GPS surveys are performed to derive accurate 3-D coor dinates at monumented benchmarks and accurate elevation profiles along foot paths. The average repeatability of the GPS measurements on benchmarks is 1 cm for measurement durations of 2-3 min. The standard deviation of interpo lated vertical coordinates obtained at the crossings of kinematic GPS profi les is 4.3 cm. The high quality of these GPS coordinates justifies their us e also for the validation of the photogrammetric DEM. A comparison of 6000 common points provides a standard deviation of residuals of 18 cm. The resu lts show that the deformation pattern of a volcanic area can be rapidly and accurately monitored even in the absence of geodetic benchmarks. The integ ration of aerial photogrammetry with GPS kinematic surveys may be considere d as an optimal approach for deriving high-resolution mapping products to b e used in support of studies of volcanic dynamics.