Tesis sobre el tema "Spaceborne lida"
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Schleich, Anouk. "Apport du lidar spatial pour le développement de méthodes d'inventaire forestier multisource adaptées à la gestion durable des forêts dans un contexte de changement global". Electronic Thesis or Diss., Paris, AgroParisTech, 2024. http://www.theses.fr/2024AGPT0002.
Texto completoThe thesis focuses on the contribution of spaceborne lidar to the development of Multisource Forest Inventory (MFI) methods. In France, the National Forest Inventory (NFI) method addresses the requirements of public policies at regional and national levels. However, on smaller territories, precision is often insufficient to meet the needs of management activities. MFI methods better address these needs by combining inventory data with remote sensing data. This thesis aims to improve NFI accuracy at sub-regional to local scales by integrating data from the spaceborne lidar GEDI into multisource approaches.Unfortunately, this integration is complicated due to the lack of spatial correspondence between field samples (inventory plots) and GEDI footprints. Additionally, GEDI data are poorly georeferenced, making them difficult to integrate into certain MFI approaches. This thesis focuses on these issues and is divided into three main parts.As a first step, a method for improving GEDI georeferencing, based on a high-resolution reference digital elevation model (DEM) was developed. This method compares, for a series of positions around the location indicated in the GEDI products, the ground elevations of the GEDI footprints with those of the reference DEM, generating an error map according to X and Y offsets. Using a flow accumulation algorithm on this error map, an improved position minimizing the distance from the DEM is proposed for each GEDI footprint.Next, two approaches for using GEDI data with NFI data were developed. The study sites are located in the Vosges and use ∼ 500 IFN plots and over 100,000 GEDI footprints.The first approach is a double sampling for stratification (2SS) approach, based on common variables between GEDI and NFI, without requiring spatial correspondence of the two data sources. 2SS approaches are generally based on probabilistic data samples, which is not a priori the case for GEDI's sampling pattern. Thus, a preliminary analysis was required to understand the characteristics of the spatial distribution of the GEDI sample. The relevance of the chosen common variable, i.e. the maximum tree height, was also verified. Compared with estimates based only on NFI data, the 2SS approach improved the variance of growing stock volume estimates by up to 56%.The second approach is based on a link between GEDI data and NFI data, established indirectly by using spatially exhaustive data sources, the Sentinel-2 and Sentinel-1 images. To establish the model linking the different data sources, we chose to use the k-nearest neighbor (kNN) method combined with bagging (bootstrap aggregation). The aim is to propagate information from field plots to GEDI footprints in order to "densify" NFI plots by taking advantage of GEDI forest structure measurements, which are well correlated with the forest attributes of interest (e.g. growing stock volume). First, for each NFI plot, we looked for the GEDI footprints with the characteristics of the Sentinel link variables, supplemented or not with a height link variable, that are closest to those of the NFI point. Using a kNN-bagging approach, the set of GEDI variables is therefore estimated for each NFI plot. Next, a regression model is established by kNN-bagging to estimate the volume using the best predicted GEDI variables from the previous step and the Sentinel variables. The volume is estimated at the level of all GEDI footprints. The strategy supplemented by a height link variable performed best and reached a coefficient of determination of 58%. Subsequently, using the resulting dense sample of volume plots, standard methods for small area estimation (scale of the municipality or district) or high-resolution volume mapping can be implemented
DeMello, John E. "Low-cost direct detect spaceborne LIDAR". Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42606.
Texto completoLIDAR has widely been used to create very accurate 3-D models for use in a wide range of commercial, governmental and nonprofit applications. This thesis identifies how recent advancements in Nd:YAG fiber lasers and InGaAs GmAPDs could be applied to space-borne missions, enabling low-cost solutions that fulfill NASA’s ICESat-2 and United States Geological Survey (USGS) objectives. An analysis of launch vehicles, standard spacecraft buses and payload technologies identified three potential low-cost solutions: one hosted aboard Iridium and two onboard a BCP2000 commercial bus. These systems were evaluated using NASA’s mass-based and aperture-based cost models to provide a rough estimate of cost versus NASA’s CALIPSO, ICESat-1 and ICESat-2 missions. Preliminary analysis shows a potential for these new technologies to outperform any previous space-based LIDAR mission. At $55M, the Iridium-hosted solution is 1/16th the cost of ICESat-2 at roughly one-third its capability. Two other solutions were estimated at $216.6M and $370.586M and provided over 3X and 10X the estimated capability of ICESat-2, respectively. Both systems are anticipated to fulfill NASA’s ice sheet and vegetation objectives while delivering a return on investment of roughly $1B per year based on USGS’s analysis of advanced 3-D data for the United States.
Tröbs, Michael. "Laser development and stabilization for the spaceborne interferometric gravitational wave detector LISA". [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974983705.
Texto completoTsui, Olivier W. L. "Integrating discrete-return scanning LiDAR and spaceborne RADAR to support aboveground biomass assessments". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44013.
Texto completoLieser, Maike Danielle [Verfasser]. "LISA optical bench development : experimental investigation of tilt-to-length coupling for a spaceborne gravitational wave detector / Maike Danielle Lieser". Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1169964109/34.
Texto completoLieser, Maike [Verfasser]. "LISA optical bench development : experimental investigation of tilt-to-length coupling for a spaceborne gravitational wave detector / Maike Danielle Lieser". Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1169964109/34.
Texto completoBallhorn, Uwe. "Airborne and spaceborne LiDAR data as a measurement tool for peatland topography, peat fire burn depth, and forest above ground biomass in Central Kalimantan, Indonesia". Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-146579.
Texto completoBallhorn, Uwe [Verfasser] y Florian [Akademischer Betreuer] Siegert. "Airborne and spaceborne LiDAR data as a measurement tool for peatland topography, peat fire burn depth, and forest above ground biomass in Central Kalimantan, Indonesia / Uwe Ballhorn. Betreuer: Florian Siegert". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1026211123/34.
Texto completoYoung, Alisa H. "The characterization of deep convection in the tropical tropopause layer using active and passive satellite observations". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41210.
Texto completoPanglosse, Aymeric. "Modélisation pour la simulation et la prédiction des performances des photodiodes à avalanche en mode Geiger pour Lidars spatiaux". Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0046.
Texto completoThis work focuses on modelling for simulation and prediction purposes ofCMOS SPADs performance parameters used in spaceborne Lidars. The innovative side ofthis work lies in a new methodology based on physical models for semiconductor devices,measurements performed on the targeted CMOS process and commercial simulation tools topredict CMOS SPADs performances. This method allows to get as close as possible to theprocess reality and to improve predictions. A set of SPAD has been designed and fabricated,and is used for measurements and model validation. SPAD design has been done with respectto CNES and Airbus Defence Space Lidar specification, in order to produce devices that willimprove our knowledge in terms of understanding of the involved physical mechanisms, SPADsdesign and test method, for a possible integration within their future spaceborne Lidars
Schwarz, Anja [Verfasser], Ulla [Akademischer Betreuer] Wandinger, Andreas [Gutachter] Macke y Lucas [Gutachter] Alados-Arboledas. "Aerosol typing over Europe and its benefits for the CALIPSO and EarthCARE missions : Statistical analysis based on multiwavelength aerosol lidar measurements from ground-based EARLINET stations and comparison to spaceborne CALIPSO data / Anja Schwarz ; Gutachter: Andreas Macke, Lucas Alados-Arboledas ; Betreuer: Ulla Wandinger". Leipzig : Universitätsbibliothek Leipzig, 2016. http://d-nb.info/1240397933/34.
Texto completoOpromolla, Roberto. "Advanced LIDAR-based techniques for autonomous navigation of spaceborne and airborne platforms". Tesi di dottorato, 2016. http://www.fedoa.unina.it/10732/1/opromolla_roberto_28.pdf.
Texto completoSong, Changbo. "Development of the Spectral Analysis System for a Spaceborne High Spectral Resolution Lidar". Tesi di dottorato, 2017. http://www.fedoa.unina.it/11577/1/PhD%20Thesis_Physics_Changbo%20SONG.pdf.
Texto completoDuncanson, Laura Innice. "Aboveground biomass estimation using spaceborne LiDAR in managed conifer forests in south central British Columbia". Thesis, 2009. http://hdl.handle.net/1828/3102.
Texto completoTröbs, Michael [Verfasser]. "Laser development and stabilization for the spaceborne interferometric gravitational wave detector LISA / von Michael Tröbs". 2005. http://d-nb.info/974983705/34.
Texto completoGarcía, Marín Antonio F. [Verfasser]. "Minimisation of optical pathlength noise for the detection of gravitational waves with the spaceborne laser interferometer LISA and LISA pathfinder / von Antonio F. García Marín". 2007. http://d-nb.info/988269724/34.
Texto completoSchwarz, Anja. "Aerosol typing over Europe and its benefits for the CALIPSO and EarthCARE missions: Statistical analysis based on multiwavelength aerosol lidar measurements from ground-based EARLINET stations and comparison to spaceborne CALIPSO data". Doctoral thesis, 2015. https://ul.qucosa.de/id/qucosa%3A14590.
Texto completoDie Bestimmung des direkten Strahlungsantriebs von Aerosolen ist mit großen Unsicherheiten behaftet. Inwiefern Aerosole die Strahlungsprozesse in der Atmosphäre beeinflussen ist abhängig von ihren optischen und mikrophysikalischen Eigenschaften. Zur Optimierung von Strahlungstransfersimulationen werden daher ergänzende Informationen über typspezifische Aerosoleigenschaften sowie die vertikale Aerosolverteilung benötigt. Im Rahmen der vorliegenden Arbeit wurden anhand von Lidarmessungen die vertikale und räumliche Verteilung atmosphärischer Aerosole über Europa analysiert sowie deren optische Eigenschaften ermittelt. Einleitend werden Möglichkeiten der Aerosolklassifizierung erläutert und Aerosoltypen spezifiziert, die über Europa beobachtet werden können. Vorherige Studien zur Aerosolklassifizierung sind in einer Literaturübersicht zusammengefasst. Anhand von Fallstudien wurde zunächst die Analyse von Beobachtungen des europäischen Lidarnetzwerkes EARLINET von 2008 bis 2010 auf das Vorhandensein von Aerosolschichten verdeutlicht. Die Herkunft jeder einzelnen Aerosolschicht wurde anschließend unter Verwendung von Modellrechnungen sowie weiteren Informationen bestimmt und aerosoltypspezifische Kenngrößen berechnet. Mit Hilfe dieser Kenngrößen ist es möglich, den Typ des Aerosols abzuleiten. Daraus wurde eine neuartige Methode zur Typisierung von Aerosolen entwickelt, die z.B. in Algorithmen zur Verarbeitung von Satellitendaten verwendet werden kann. Zusätzlich wurden Umrechnungsfaktoren bestimmt, die zur Zusammenführung und zum Vergleich von Daten aktueller und zukünftiger Satellitenmissionen benötigt werden. Die Ergebnisse der Aerosoltypisierung auf Basis von EARLINET-Daten wurden anschließend mit Ergebnissen der automatischen Typisierung weltraumbasierter Lidarmessungen des CALIPSO-Satelliten verglichen. Es konnte gezeigt werden, dass innerhalb des CALIPSO-Algorithmus systematisch fehlerhafte Klassifizierungen des Aerosoltyps auftreten. Diese falsche Klassifizierung führt zu einer Unterschätzung der Einfachstreualbedo und zu einer Überschätzung der erwärmenden Wirkung der betreffenden Aerosolschicht. Die überschätzte Wärmewirkung hat wiederum fehlerhafte Ergebnisse bei Strahlungstransferrechnungen, die auf CALIPSO-Daten basieren, zur Folge.