scholarly journals Using Combined Close-Range Active and Passive- Remote Sensing Methods to Detect Sinkholes

2018 ◽  
Vol 07 (01) ◽  
Author(s):  
Naftly Goldshleger ◽  
Uri Basson ◽  
Ilan Azaria ◽  
Shlomo Fastig
Keyword(s):  
Remote Sensing ◽  
Passive Remote Sensing ◽  
Close Range ◽  
Remote Sensing Methods

scholarly journals GB-SAR in the Diagnosis of Critical City Infrastructure—A Case Study of a Load Test on the Long Tram Extradosed Bridge

2020 ◽  
Vol 12 (20) ◽  
pp. 3361
Author(s):  
Przemysław Kuras ◽  
Łukasz Ortyl ◽  
Tomasz Owerko ◽  
Marek Salamak ◽  
Piotr Łaziński
Keyword(s):  
Remote Sensing ◽  
Cross Sections ◽  
Load Test ◽  
Test Method ◽  
Static Load Test ◽  
Remote Sensing Technique ◽  
Close Range ◽  
Remote Sensing Methods ◽  
Contact Measurements

This article describes a case of using remote sensing during a static load test of a large bridge, which, because of its location, belongs to a critical city infrastructure. The bridge in question is the longest tram flyover in Poland. This is an extradosed-type concrete structure. It conducts a long tram line over 21 other active lines of an important railway station in the center of Cracow. The diagnostic of such bridges involving the load test method is difficult. Traditional, contact measurements of span displacements are not enough anymore. In such cases, remote sensing becomes an indispensable solution. This publication presents an example of using the close-range radar remote sensing technique of ground-based radar interferometry. However, the cross-sections of the huge bridge were observed using several methods. The aim was to confirm the conditions and efficiency of radar displacement measurements. They were therefore traditional contact measurements using mechanic sensors conducted, if possible, to the bottom of the span, for precise leveling and measurement using electronic total station. Comparing the results as well as the discussion held demonstrated the fundamental advantages of remote sensing methods over the other more traditional techniques.

scholarly journals Remote Sensing

2017 ◽  
Vol 58 ◽  
pp. 10.1-10.21 ◽  
Author(s):  
J. Bühl ◽  
S. Alexander ◽  
S. Crewell ◽  
A. Heymsfield ◽  
H. Kalesse ◽  
...  
Keyword(s):  
Remote Sensing ◽  
In Situ Measurements ◽  
Ice Formation ◽  
Literature Study ◽  
Passive Remote Sensing ◽  
Level Information ◽  
Formation And Evolution ◽  
Remote Sensing Techniques ◽  
Remote Sensing Methods

Abstract State-of-the-art remote sensing techniques applicable to the investigation of ice formation and evolution are described. Ground-based and spaceborne measurements with lidar, radar, and radiometric techniques are discussed together with a global view on past and ongoing remote sensing measurement campaigns concerned with the study of ice formation and evolution. This chapter has the intention of a literature study and should illustrate the major efforts that are currently taken in the field of remote sensing of atmospheric ice. Since other chapters of this monograph mainly focus on aircraft in situ measurements, special emphasis is put on active remote sensing instruments and synergies between aircraft in situ measurements and passive remote sensing methods. The chapter concentrates on homogeneous and heterogeneous ice formation in the troposphere because this is a major topic of this monograph. Furthermore, methods that deliver direct, process-level information about ice formation are elaborated with a special emphasis on active remote sensing methods. Passive remote sensing methods are also dealt with but only in the context of synergy with aircraft in situ measurements.

scholarly journals Characterization and longitudinal study of aerosol particles using a synergy of lidar techniques and passive remote sensing methods in the Mediterranean basin

2020 ◽  
Author(s):  
Ουρανία Σουπιωνά
Keyword(s):  
Remote Sensing ◽  
Longitudinal Study ◽  
Mediterranean Basin ◽  
Aerosol Particles ◽  
Light Detection And Ranging ◽  
Light Detection ◽  
Passive Remote Sensing ◽  
The Mediterranean ◽  
Remote Sensing Methods ◽  
The Mediterranean Basin

H παρούσα Διδακτορική Διατριβή έχει ως αντικείμενο τη μελέτη των τροποσφαιρικών αερολυμάτων με τη χρήση επίγειων και δορυφορικών τεχνικών, για την ανάκτηση των οπτικών ιδιοτήτων των αιωρούμενων σωματιδίων και την στατιστική ανάλυσή τους. Παράλληλα, εφαρμόζονται μαθηματικοί αλγόριθμοι για την ανάκτηση των μικροφυσικών τους ιδιοτήτων, καθώς και γίνεται χρήση προγνωστικών μοντέλων για ανάκτηση επιπλέον πληροφοριών, όπως ο προσδιορισμός της πηγής προέλευσης των αιωρούμενων σωματιδίων, αλλά και η επίδρασή τους στο ατμοσφαιρικό ενεργειακό ισοζύγιο. Στο πρώτο κεφάλαιο (Κεφάλαιο 1) περιλαμβάνεται το θεωρητικό υπόβαθρο των ατμοσφαιρικών αερολυμάτων, ο ρόλος τους στην ατμοσφαιρική Φυσική, καθώς και οι διάφοροι τύποι αερολυμάτων, δίνοντας τη συνολική εικόνα του πεδίου μελέτης. Στο Κεφάλαιο 2 αναφέρονται οι θεμελιώδεις πτυχές της ατμοσφαιρικής Φυσικής και της Οπτικής, με έμφαση στους μηχανισμούς αλληλεπίδρασης του φωτός με τα ατμοσφαιρικά στοιχεία (αερολύματα και μόρια). Οι τεχνικές τηλεπισκόπησης αερολυμάτων που έχουν χρησιμοποιηθεί ευρέως σε αυτή τη διατριβή παρουσιάζονται στο Κεφάλαιο 3, μαζί με λοιπά διαθέσιμα όργανα που χρησιμοποιήθηκαν για τη λήψη δεδομένων των προς εξαγωγή αποτελεσμάτων. Συγκεκριμένα παρουσιάζεται η τεχνική light detection and ranging (lidar), καθώς και τα διάφορα στάδια επεξεργασίας των σημάτων lidar. Τα ατμοσφαιρικά προγνωστικά μοντέλα αλλά και εργαλεία που αξιοποιούν δορυφορικές μετρήσεις και χρησιμοποιήθηκαν για την ενίσχυση των αποτελεσμάτων μας παρουσιάζονται εν συντομία στο Κεφάλαιο 4. Η περιεκτική ανάλυση των αποτελεσμάτων παρουσιάζεται στο Κεφάλαιο 5, ενώ τα συμπεράσματα παρατίθενται στο Κεφάλαιο 6, που αποτελεί το τελευταίο κεφάλαιο αυτής της Διατριβής.

scholarly journals Synergy of Active- and Passive Remote Sensing: An Approach to Reconstruct Three-Dimensional Cloud Macro- and Microphysics

2020 ◽  
Author(s):  
Lucas Höppler ◽  
Felix Gödde ◽  
Manuel Gutleben ◽  
Tobias Kölling ◽  
Bernhard Mayer ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Microwave Radiometer ◽  
Three Dimensional ◽  
Passive Remote Sensing ◽  
Three Dimensional Representation ◽  
Hyper Spectral ◽  
Lidar Measurements ◽  
Research Aircraft ◽  
Remote Sensing Methods ◽  
Thermodynamic Phase

Abstract. This paper presents a method to retrieve three-dimensional cumulus cloud macro- and microphysics measured by remote sensing instruments on the German research aircraft HALO. This is achieved by combining our hyper-spectral pushbroom spectrometer specMACS with active and passive remote sensing instruments, such as a lidar, a microwave radiometer, a radar and dropsondes. Two-dimensional cloud information such as cloud size, optical thickness, effective radius and thermodynamic phase are retrieved by specMACS with established remote sensing methods. Information of the other active and passive remote sensing instruments with a smaller field-of-view are mapped to the wider specMACS swath following Barker et al. (2011). The combination of specMACS with passive and active remote sensing quantities, for example, the Cloud Top Height from lidar measurements, allows new possibilities: three-dimensional cloud macrophysics can be reconstructed. Applying a sub-adiabatic microphysical model constrained with measurements allows to extend the measured quantities to a three-dimensional representation of microphysics. A consistency check by means of a three-dimensional radiative transfer simulation of the specMACS observations of these derived three-dimensional cloud fields shows good agreement.

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