Tesis sobre el tema "LIDAR source"
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Collar, A. J. "Differential absorption lidar using an optical parametric oscillator source". Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370334.
Texto completoCadiou, Erwan. "LIDAR DIAL multi espèces à base de sources paramétriques optiques pour la détection des gaz à effet de serre depuis l'espace". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX102/document.
Texto completoSustained and accurate greenhouse gases measurements at a global scale are required to improve the knowledge on their sources and sinks and thus increase the accuracy of climate change projections. In order to consolidate the global observation networks, spaceborne lidar systems for future earth observation missions are regarded as innovative and complementary components to the present operational measurement methods. In this context, this research work has consisted in developing a differential absorption DIAL lidar based on an optical parametric source able to emit in the 1,9–2,3 µm spectral range. The purpose was to demonstrate its ability to be implemented in long range measurements of the main greenhouse gases (CO2, H2O, CH4). Then, the laser transmitter has been integrated in a lidar architecture which was previously designed using a numerical model. Improvements and optimization of the lidar system focused on two aspects: the monitoring of the spectral purity of the emitter and the control of the detection and acquisition. Concentration measurements on the three gases have been carried out from the laboratory based on atmospheric backscattered signals from clouds and aerosol. These measurements provided a basis for the investigation of the error and bias sources. On the basis of these measurements, instrument scaling for future airborne demonstrations is discussed. Projected performances of a spaceborne instrument are also presented
Berthomé, Quentin. "Source paramétrique infrarouge agile en longueur d'onde pour la détection à distance de substances chimiques". Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP028.
Texto completoLidar absorption spectrometry is a powerful solution for remote gas detection. For this purpose, longwave infrared between 8 and 12 µm is ideal as it covers characteristic absorption bands of many gases including chemical warfare agents and toxic industrial chemicals. However, the challenge of a pulsed narrow-spectrum broadly tunable in the 8 to 12 µm range has only be partially solved. This thesis aims to demonstrate how to make such a laser source basing on previous works. The master oscillator is a nested cavity optical parametric oscillator (NesCOPO) with an OP-GaAs crystal. It is pumped with an actively Q-switched 2 µm Tm:YAP laser which has been made wavelength tunable with a transversally chirped volume Bragg grating. Important design and simulation works are made to ensure single longitudinal mode operation of the pump laser while maintaining its repetition rate and peak power and wavelength tunability. Finally, with this laser and a wavelength measurement system using pump/signal SFG to perform measurements in the 8 to 12 µm range, we experimentally show that wavelength tunability of a NesCOPO is wider and faster through pump wavelength tunning than through NesCOPO non-linear crystal temperature tunning
Dejan, Vasić. "Model geodetskog premera savremenim akvizicionim tehnologijama". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=106256&source=NDLTD&language=en.
Texto completoThe collection of spatial data is carried out today by conventional methods,which usually provide the required accuracy of the output data in the projectsof diameter and diameter reconstruction, by various projects in the field ofengineering geodesy. On the other hand, the development of newtechnologies and data collection devices imposes new methods of work thatprovide an incomparably higher level of detail than conventional methods,and they often have an advantage over conventional, especially inengineering projects. In the dissertation, the model of geodetic diametermodel was presented with modern acquisition technologies that meets thequality criteria defined by the Land Regulations Rulebook and the criteria ofengineering geodesy.
SCARPIGNATO, GERARDO CRISTIAN. "Design, fabrication and characterization of a optical power amplifier based on special glasses for LIDAR sources". Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2543142.
Texto completoZimnicki, James John. "Spatial Heterodyne Imaging Using a Broadband Source". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263.
Texto completoGengembre, Cyril. "Variabilité multi-échelles de la météorologie et des aérosols en situation littorale sous influence industrielle". Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0489/document.
Texto completoOn a site that is multi-influenced by urban and industrial emissions, the analysis of aerosol pollution, in the vicinity of sources, requires a multi-scale knowledge of atmospheric dynamics. A measurement campaign was developed in order to study the meteorological and micro-meteorological variability and the evolution of particles, in particular, submicronic evolution, during a one-year period.Oscillations of the aerosol concentration around the regional average were identified along the Dunkirk coastline, and were attributed to the local meteorological phenomena close to the industries. Recognition and machine learning methods using measurements by an ultrasonic anemometer and vertical wind profiles by a Doppler lidar, were implemented to define the variability of relevant phenomena in air pollution events : sea breeze, fog, front and storm. A six-years database analysis has highlighted a correlation between the annual sea breeze occurrence and the annual number of anticyclonic days. Furthermore, the annual fog frequency could be connected with the annual regional concentration of aerosols. Analysis of wind covariance revealed two contrasting situations, low-level and high-level turbulent fluxes. The fog and the sea breeze, with low-level fluxes, generate a high PM₁ pollution and are in favor of a high organic oxygenated aerosols concentration (secondary aerosols). High-level fluxes situations, favoring vertical exchanges, are associated with a large variability of sulfate aerosols. The long-term observation, made it possible to highlight the development of episodes of particulate pollution during local weather phenomena, owing to the local emissions, but also by taking into account the larger-scale pollution
Landgren, Peter. "Den tredimensionella arkeologin : En studie om 3D-modellernas betydelse i fältet". Thesis, Umeå universitet, Institutionen för idé- och samhällsstudier, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-173368.
Texto completoNilsson, Olov. "3D- modellering med LAS-data : Tester i ett licensierat- och i ett Open source-program". Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72665.
Texto completoIt has become more popular to create 3D models among local governments and companies today. Now it´s possible to visualize most objects in 3D, which can give an increased understanding. The local government in Lidköping wants to be able to use their LiDAR data to visualize buildings and to combine several data layers with 3D visualizations to create useful web map services. At the present, there is no software that are able create 3D models of LiDAR data at the Local government. The local government in Lidköping is interested in testing different options for modelling in 3D. Two software packages were chosen; ArcGIS Pro and QGIS. ArcGIS Pro is a GIS software that is highly acknowledged in the market. It´s licensed and can be considered expensive. QGIS is a software that is completely free to use and uses open source code, which makes it possible to create algorithms that can then be used in the program. In this view, there will be comparison between a software that is expensive and a software that is completely free. The method used to compare the two software consists of three stages. Stage 1 is a software comparison, where the software capabilities are set against each other in different scenarios. Stage 2 is an investigation of positional accuracy where the coordinates of the 3D model's building corners are compared with coordinates measured with Total Station as reference. RMSE is used to compare positional accuracy. Stage 3 is a visualization analysis that takes place through a questionnaire answered by people who are familiar with GIS and 3D. The result of all three stages, according to the method performed, shows that ArcGIS Pro is the better software. At stage 1, ArcGIS Pro won five out of eight scenarios against QGIS, though QGIS was more time efficient than ArcGIS Pro. At stage 2, ArcGIS Pro had a RMSE value for height of 1,617, which is lower than the 1,961 RMSE value that was on QGIS. At stage 3, ArcGIS Pro had over 90% of the reply rate for most of the questions, representing that ArcGIS Pro’s images were better to visualize the different scenarios. Some comparisons were not completely even though. QGIS had better time accuracy because it did not get as much errors which needed further investigations as in ArcGIS Pro. Although ArcGIS Pro’s processes for creating 3D models were faster. The positional accuracy comparison for the building’s height shows higher accuracy between ArcGIS Pro and the Total Station’s measurements. In QGIS the 3D-modell had no roof model, which made it harder to get accurate height of the building.
DELMONTE, STEPHANE. "Etude d'une source lidar emettant a 2 microns pour la mesure simultanee de vapeur d'eau et de vent dans la basse troposphere a partir d'une plateforme spatiale". Paris 6, 1997. http://www.theses.fr/1997PA066298.
Texto completoRawle, Christopher B. y n/a. "Coherent multiwavelength sources for tropospheric aerosol lidar". University of Otago. Department of Physics, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070427.114533.
Texto completoHamoudi, Thomas. "Nouveaux concepts de sources lasers et paramétriques pour lidar à absorption différentielle". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP077.
Texto completoThe monitoring and control of greenhouse gas emissions on industrial sites is a major theme for the ecological transition. One approach to address this issue is to probe the gas concentration in plumes emitted by plants. A solution for the future is based on the development of a differential absorption lidar (DIAL) measuring instrument, which makes it possible to analyze the concentration and locate the emission of gas. In this context, ONERA is committed to the development of NesCOPO-type parametric sources, energetic and tunable in specific spectral bands.The deployment of such a technology in the field requires the development of a versatile, robust and very compact instrument. To achieve these objectives, the project will focus on the following points: versatility and robustness. As a first step, a study of the wavelength control of NesCOPO has been carried out. The aim was to choose the emission wavelength of the complementary wave of the OPO (around 3.3 µm), and to stabilize it by controlling the pump wavelength. It is the mixing of this complementary wave and another pump laser in optical parametric amplification (OPA) stages that made it possible to generate a wave around 1.5 µm. The wavelength tuning of the wave at 1.5 µm is obtained with the pump frequency of the OPA. This pump laser requires specific characteristics of tunability and energy. For this, we have chosen a MOPA architecture, with a tunable fiber laser as the injection source. A hybrid amplification architecture based on ytterbium doped fibers followed ytterbium bulk crystals allows us to obtain energies of several mJ. The fiber stages defines the temporal characteristics of the source (15 ns at 5 kHz). Limited by the stimulated Brillouin scattering, the energy rise is ensured by the bulk crystal-based amplification stages.Following this, OPA stages were set up, pumped by the tunable pump laser and injected by the complementary wave of the OPO. This signal wave from the OPA is then amplified by non-linear crystals positioned in cascades, delivering energy pulses in the order of hundred µJ. The wavelength tuning of this wave by the pump wavelength is characterized directly and by an absorption spectroscopy experiment with acetylene. This signal wave from the OPA was then amplified by non-linear crystals positioned in cascades, delivering pulses of the order of a hundred µJ
Aubourg, Adrien. "Sources laser à fibre cristalline YAG dopée erbium et pompée par diode". Thesis, Palaiseau, Institut d'optique théorique et appliquée, 2014. http://www.theses.fr/2014IOTA0008/document.
Texto completoAmong the several applications of laser sources, some requires kilometers range propagation in the atmosphere : telemetry, guidance system or active imagery. High pulse energy improves the range of the system, but may cause permanent blindness to an observer's eyes. Hence, these applications must use laser beam which wavelength are located in the eye-safe region, ideally at the local minimum of the atmosphere absorption (1550-1650 nm). Such laser sources are already commercially available, but are not suited for the demanding military needs : compacity, electrical consumption, performance and large operating temperature range (-40°C/+60°C).My work aims to develop a laser source filling these specifications. Thanks to the collaboration with the industrial partners Fibercryst and Cilas, it focuses on the design of a compact, efficient, directly diode-pumped Er3+:YAG single cristal fiber laser for military applications.With a homemade numerical simulation of a passively Q-switched Er3+:YAG laser source, many laser emitters are experimentally designed and compared. Further studies around saturable absorbers allowed sensible improvements of the output pulse energy.This work, whose results may already be commercially interesting, may lead to new technics and architectures of erbium doped solid-state laser for better prototypes
Scarpignato, Gerardo Cristian. "Conception, fabrication et caractérisation d'un amplificateur de puissance à base de verres spéciaux pour les sources LIDAR". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT008.
Texto completoThe objective of the present research is the study, fabrication and characterization of a power amplifier based on special glasses to be implemented as an embedded module inside a pulsed laser device with high coherence working at 1550 nm wavelength. The optical amplifier represents the second module of a laser in configuration MOPA (Master Oscillator Power Amplifier). The device must amplify the signal proceeding from a seed laser and allow the propagation of the signal at high distances while maintaining the spectral characteristics of the high coherent source. The device obtained with this approach will be employed as a source for a monitoring LIDAR system, which will be installed in train monitoring portals. The results can be extended to other applications as well, such as aeroplanes, meteorological stations or airports. The current research work is intended to contribute to the fabrication of compact devices that seems not be still available even in laboratories
Lo scopo della presente ricerca `e lo studio, la realizzazione e la caratter-izzazione di un amplificatore di potenza a base di vetri speciali da utiliz-zare come modulo da implementare all’interno di un dispositivo laser adimpulsi ad elevata coerenza operante alla lunghezza d’onda di 1550 nm.L’amplificatore ottico rappresenta il secondo modulo di un laser in configu-razione MOPA (Master Oscillator Power Amplifier): esso ha la funzione diamplificare il segnale proveniente da un laser “seed” e permette di propa-gare il suo segnale ad elevate distanze, mantenendo tuttavia le caratteris-tiche spettrali di elevata coerenza della sorgente. Il dispositivo cos`ı ottenutosar`a utilizzato come sorgente per un sistema LIDAR di rilevazione a bordodi aerei, autoveicoli e stazioni meteorologiche o aeroporti. Questi sistemisembrano non essere ancora disponibili neanche a livello dei laboratori diricerca
Pellegrino, Jessica. "Développement de deux instruments LIDAR multi-longueurs d'onde et multi-espèces à base de sources paramétriques". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066531/document.
Texto completoAtmospheric global monitoring and air quality are major environmental concerns. Global monitoring of some trace and green-house gases would help to understand the consequences of human activities on our environment. The aim of this work is to develop two multi-wavelengths and multi-species direct detection lidar instruments, based on the same laser transmitter baseline approach - an innovative parametric source, the Nested Cavity optical parametric oscilator-and to target two applications: the monitoring of air quality on industrial sites and the monitoring of greenhouse gases from space. The first instrument was designed for industrial plant monitoring applications, in the 3.3-3.8µm, and allows the measurement of multi-species mean concentrations along the line of sight, over a range of around a hundred meters. This instrument was implemented for simultaneous measurements of atmospheric methane and water vapour.The second instrument targets the green-house gases measurement from space applications. In this frame, a new multi-wavelengths and multi-species emitter was developed at 2 µm for space applications. We have demonstrated that this new emitter could address three species: carbon dioxide, water vapor and methane, and studied his potential for space-borne applications.. The architecture of a complete range-resolved instrument based on this transmitter was proposed. Moreover, a numerical algorithm was developed to estimate the instrument’s performances with a direct detection scheme
Rambaldi, Patrick. "Développement de nouvelles sources laser accordables de l'ultra-violet à l'infra-rouge pour une application lidar". Lyon 1, 1997. http://www.theses.fr/1997LYO10271.
Texto completoPham, Cécil. "Sources laser de puissance à semi-conducteurs 1,55µm pour transmission en espace libre et applications LIDAR". Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0021/document.
Texto completoFree space optical transmissions for satellite-satellite or satellite-ground links are booming. The most effective transmission systems rely on the use of a solid state laser or a Master Oscillator Power Amplifier (MOPA) laser emitter consisting in a laser source, an external modulator and an Erbium Doped Fiber Amplifier (EDFA). These emitters present several drawbacks : high weight and dimensions, high sensitivity to radiations, high power consumption. The PhD work is based on this observation and aims to develop high power MOPA emitting at 1.5μm monolithically integrated on InP.The PhD consisted in the conception of two MOPA types, one with a shallow ridge waveguide and the other with buried guides (Semi-Insulating Buried Heterostructure or SIBH). Propagation and optical mode simulations allowed us to validate the waveguide dimensions. The MOPAs include a DFB laser, an electro-optic modulator and a flared amplifier. Several taper angles are designed. The fabrication process in clean room allowed several technological achievements, especially the fabrication of SIBH MOPA and tapered SOA.We demonstrated 380 mW CW of optical power and a spectral single mode operation with the shallow ridge MOPAs. S21 measurements were also done on MOPAs and SIBH SOAs with a structure similar to the fabricated MOPAs. These measurements allowed us to develop a transfer function model for SOA. The model is based on measurable parameters and showed an excellent fit with the measurements, allowing us to find carrier lifetimes. Eye diagrams on directly modulated SOA are done. The extinction ratio i slow (<1 dB) but the eye is open at 5 Gbps and 10 Gbps, limited by the RF power of the numerical signal generator. These results pave the way to the investigation of optimal points of operation and configurations for high power MOPA and SOA for data transmission
Isabel, Marc-André. "Estimation haute-résolution de la position de cibles en mouvement à partir du suivi du sous-espace sources et d'un estimateur statistique de 2e ordre". Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/40299.
Texto completoIn 1995, LIDAR systems emerged as a new alternative to the well-known RADAR systems for remote sensing applications. However, unlike RADAR, the operating frequency of LIDAR systems is above the radio frequencies and usually in the infrared which means that a non-coherent detection has to be used to retrieve the signal's enveloppe. While several signal processing algorithms have been developped for RADAR phased arrays, none of these algorithms are known, to this day, to be e cient when dealing with real, phaseless signals. In 2015, as part of a research project to enhance the detection precision and maximal distance of a LIDAR system, an adaptation [1] of the so-called MUSIC algorithm developped by Schmidt was realised to be used with the time-of- ight principle instead of the direction of arrival principle. Unfortunately, the direct application of the adapted algorithm was time consuming, especially the creation, processing and eigendecomposition stages of the ReXX matrix. As so, optimizations are required to allow its implementation into a low-cost system for real-time purposes. Among those optimizations, the use of subspace tracking methods will be studied in this thesis. Subspace tracking algorithms are based on the idea that instead of having to create ReXX at each data update, one can use the known data while adding the new data with a forgetting factor. The result of these optimizations is that a decrease of 25% to 95% in execution time is observed when subspace tracking is used together with a higher complexity method to initialize its parameters. The study realised by [1] was mostly done for stationary objects. This thesis aims to extend that study to non stationary objects. Results show that using subspace tracking methods is even more efficient in these cases.
Armougom, Julie. "Nouvelles sources optiques pour la détection d’espèces chimiques dans la bande III". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT077/document.
Texto completoLaser spectrometry by differential absorption is a well-known technique for standoff detection of chemical species in the atmosphere. The longwave infrared region (LWIR), ranging from 8 to 12 µm is particularly interesting because the absorption bands of many chemical species are intense and non-overlapping. In order to detect those species in the LWIR, there is a need for sources that are spectrally narrow, widely tunable, and delivers high energies. The sources based on second order nonlinear optics are the only technology able to meet those requirements. In this work, we will present the experimental results on two parametric architectures that allows emission in the LWIR for lidar measurements. The first one consists in emitting a beam directly in the LWIR by pumping nonlinear crystals with 2 µm pump lasers. The second architecture consists in amplifying the signal and idler beams coming from a 2 µm OPO, before converting them into the LWIR by difference frequency generation. Those sources are based on the association of new technologies and have the potential to offer a viable solution to a lack of sources emitting in the LWIR
CAZENEUVE, HELENE. "Etude theorique et experimentale de sources laser vibroniques appliquees a la mesure de variables meteorologiques par lidar embarque". Paris 6, 1990. http://www.theses.fr/1990PA066439.
Texto completoCorrea, Silva Joan Li Guisell y Sofia Jönsson. "Investigation of Increased Mapping Quality Generated by a Neural Network for Camera-LiDAR Sensor Fusion". Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297463.
Texto completoDenna studie undersökte kartläggningen i Simultaneous Localisation And Mapping (SLAM) problem, i kontexten av två sensorers felkällor. Sensorerna som användes var en Intel Realsense djupseende kamera samt en LiDAR fran RPlidar. Både kameror och LiDARs är vanliga sensorer i SLAM system, och båda har olika typer av felkällor. Kameror är typiskt känsliga för mycket starkt ljus, medan LiDARs har svårt med reflekterande ytor. Med detta som bakgrund har denna studie undersökt möjligheten att implementera ett neuralt nätverk för att detektera när varje sensor är utsatt för en felkälla (och därmed ger fel data). Nätverkets klassificering används sedan för att i varje tidssteg exkludera den sensors data som det är fel på för att förbättra kartläggningen. De qvantitativa resultaten visade ingen signifikant skillnad mellan kartorna genererade med nätverket och de utan nätverket. Dock visade den kvalitativa analysen att det finns vissa fördelar med att använda det neutrala nätverket. Manga av kamerans fel blev korrigerade när nätverket var implementerat, vilket ledde till mer korrekta kartor under kontinuerlig körning. Slutsatsen blev att ett nätverk kan bli tränat för att identifiera fel i datan, men att kameran drar mest nytta av det. Studien producerade även sekundara resultat som också redovisas. Slutligen rekommenderas optimering av nätverket, val av sensorer, samt uppdaterad algoritm för sensor fusionen som möjliga områden till fortsatt forskning inom området.
Irma, Erdeji. "Individualni i organizacioni prediktori prosocijalnog ponašanja zaposlenih u sektoru turističkih krstarenja". Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=104680&source=NDLTD&language=en.
Texto completoThis research provides an insight into the relationship structure of LMX exchange, emotional intelligence, and prosocial service behavior (extra-role, in-role behavior and cooperativeness) of employees in cruise industry. The survey was conducted on a sample of 270 respondents employed on twelve luxury river cruise ships that cruise European rivers. LMX exchange and emotional intelligence turned out to be predictors of extra-role, in-role behaviour and cooperativeness, whereby LMX has a mediating function on the relation between between the management of emotions and in-role behavior, where LMX reduces the impact of management of emotions. Also, LMX exchange has a mediating function on the relation between the empathy and cooperation whereby the influence of empathy is reduced. In conclusion, it was found that LMX exchange has a mediating function on the relation between the self- awareness and cooperation whereby LMX exchange reduces the impact of self-awareness. Based on these findings, both managerial and research implications are presented.
Sobieszczyk, Steven. "Using Turbidity Monitoring and LiDAR-Derived Imagery to Investigate Sources of Suspended Sediment in the Little North Santiam River Basin, Oregon, Winter 2009-2010". PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/176.
Texto completoLundberg, Gustav. "Automatic map generation from nation-wide data sources using deep learning". Thesis, Linköpings universitet, Statistik och maskininlärning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170759.
Texto completoKasperski, Johan. "Confrontation des données de terrain et de l'imagerie multi-sources pour la compréhension de la dynamique des mouvements de versants". Phd thesis, Université Claude Bernard - Lyon I, 2008. http://tel.archives-ouvertes.fr/tel-00380467.
Texto completoDaigle, Jean-François. "FILAMENTATION IN AIR. Evolution, Control and Applications". Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28766/28766.pdf.
Texto completoYadav, BKV. "Mapping species composition and structure in wet eucalypt forest using multi-source remote sensing data". Thesis, 2019. https://eprints.utas.edu.au/34651/1/Yadav_whole_thesis.pdf.
Texto completo石井, 昌憲 y Shoken Ishii. "Arctic Tropospheric Aerosols Observed by Lidar during Winter Seasons at Eureka, Canada : Optical Properties and Source Regions of Aerosol layers". Thesis, 2001. http://hdl.handle.net/2237/16338.
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