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Monitoring Active Volcanos Using Aerial Images and the Orthoview Tool
Author(s)
Language
English
Obiettivo Specifico
5V. Sorveglianza vulcanica ed emergenze
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/6 (2014)
Pages (printed)
12166-12186
Issued date
December 5, 2014
Abstract
In volcanic areas, where it can be difficult to perform direct surveys, digital
photogrammetry techniques are rarely adopted for routine volcano monitoring. Nevertheless,
they have remarkable potentialities for observing active volcanic features (e.g., fissures, lava
flows) and the connected deformation processes. The ability to obtain accurate quantitative
data of definite accuracy in short time spans makes digital photogrammetry a suitable method
for controlling the evolution of rapidly changing large-area volcanic phenomena. The
systematic acquisition of airborne photogrammetric datasets can be adopted for
implementing a more effective procedure aimed at long-term volcano monitoring and hazard
assessment. In addition, during the volcanic crisis, the frequent acquisition of oblique digital
images from helicopter allows for quasi-real-time monitoring to support mitigation actions
by civil protection. These images are commonly used to update existing maps through a
photo-interpretation approach that provide data of unknown accuracy. This work presents a
scientific tool (Orthoview) that implements a straightforward photogrammetric approach to
generate digital orthophotos from single-view oblique images provided that at least four
Ground Control Points (GCP) and current Digital Elevation Models (DEM) are available. The influence of the view geometry, of sparse and not-signalized GCP and DEM
inaccuracies is analyzed for evaluating the performance of the developed tool in comparison
with other remote sensing techniques. Results obtained with datasets from Etna and
Stromboli volcanoes demonstrate that 2D features measured on the produced orthophotos
can reach sub-meter-level accuracy.
photogrammetry techniques are rarely adopted for routine volcano monitoring. Nevertheless,
they have remarkable potentialities for observing active volcanic features (e.g., fissures, lava
flows) and the connected deformation processes. The ability to obtain accurate quantitative
data of definite accuracy in short time spans makes digital photogrammetry a suitable method
for controlling the evolution of rapidly changing large-area volcanic phenomena. The
systematic acquisition of airborne photogrammetric datasets can be adopted for
implementing a more effective procedure aimed at long-term volcano monitoring and hazard
assessment. In addition, during the volcanic crisis, the frequent acquisition of oblique digital
images from helicopter allows for quasi-real-time monitoring to support mitigation actions
by civil protection. These images are commonly used to update existing maps through a
photo-interpretation approach that provide data of unknown accuracy. This work presents a
scientific tool (Orthoview) that implements a straightforward photogrammetric approach to
generate digital orthophotos from single-view oblique images provided that at least four
Ground Control Points (GCP) and current Digital Elevation Models (DEM) are available. The influence of the view geometry, of sparse and not-signalized GCP and DEM
inaccuracies is analyzed for evaluating the performance of the developed tool in comparison
with other remote sensing techniques. Results obtained with datasets from Etna and
Stromboli volcanoes demonstrate that 2D features measured on the produced orthophotos
can reach sub-meter-level accuracy.
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article
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