As a result of the catastrophic hydrogeological events which occurred in May 1998 in Campania, in the south of Italy, the distinctive features of airborne laser scanning mounted on a helicopter were used to survey the landslides at Sarno and Quindici. In order to survey the entire zone of interest, approximately 21 km2, it was necessary to scan 12 laser strips. Many problems arose during the survey: difficulties in receiving the GPS signal, complex terrain features and unfavorable atmospheric conditions. These problems were investigated and it emerged that one of the most influential factors is the quality of GPS signals. By analysing the origi¬nal GPS data, the traces obtained by fixing phase ambiguity with an On The Fly (OTF) algorithm were iso¬lated from those with smoothed differential GPS solution (DGPS). Processing and analysis of laser data showed that not all the overlapping laser strips were congruent with each other. Since an external survey to verify the laser data accuracy was necessary, it was decided to utilize the Kinematic GPS technique. The laser strips were subsequently adjusted, using the Kinematic GPS data as reference points. Bearing in mind that in mountainous areas like the one studied here it is not possible to obtain nominal precision and accu¬racy, a good result was nevertheless obtained with a Digital Terrain Model (DTM) of all the zones of inter¬est.

Kinematic GPS survey as validation of LIDAR strips accuracy / Barbarella M.; Gordini C. - In: ANNALS OF GEOPHYSICS. - ISSN 1593-5213. - STAMPA. - 1 / 49:(2006), pp. 147-159.

Kinematic GPS survey as validation of LIDAR strips accuracy

BARBARELLA, MAURIZIO;GORDINI, CRISTIAN
2006

Abstract

As a result of the catastrophic hydrogeological events which occurred in May 1998 in Campania, in the south of Italy, the distinctive features of airborne laser scanning mounted on a helicopter were used to survey the landslides at Sarno and Quindici. In order to survey the entire zone of interest, approximately 21 km2, it was necessary to scan 12 laser strips. Many problems arose during the survey: difficulties in receiving the GPS signal, complex terrain features and unfavorable atmospheric conditions. These problems were investigated and it emerged that one of the most influential factors is the quality of GPS signals. By analysing the origi¬nal GPS data, the traces obtained by fixing phase ambiguity with an On The Fly (OTF) algorithm were iso¬lated from those with smoothed differential GPS solution (DGPS). Processing and analysis of laser data showed that not all the overlapping laser strips were congruent with each other. Since an external survey to verify the laser data accuracy was necessary, it was decided to utilize the Kinematic GPS technique. The laser strips were subsequently adjusted, using the Kinematic GPS data as reference points. Bearing in mind that in mountainous areas like the one studied here it is not possible to obtain nominal precision and accu¬racy, a good result was nevertheless obtained with a Digital Terrain Model (DTM) of all the zones of inter¬est.
2006
Kinematic GPS survey as validation of LIDAR strips accuracy / Barbarella M.; Gordini C. - In: ANNALS OF GEOPHYSICS. - ISSN 1593-5213. - STAMPA. - 1 / 49:(2006), pp. 147-159.
Barbarella M.; Gordini C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/43724
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