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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 21 to 23 of 23 (0.027 seconds)Spelling suggestions: "subject:"longitude."" "subject:"eongitude.""
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AJUSTAMENTO DE LINHA POLIGONAL NO ELIPSÓIDE / TRAVERSE ADJUSTMENT IN THE ELLIPSOIDBisognin, Márcio Giovane Trentin 26 April 2006 (has links)
Traverses Adjustment in the surface of the ellipsoid with the objectives to guarantee
the solution unicity in the transport of curvilinear geodesic coordinates (latitude and
longitude) and in the azimuth transport and to get the estimates of quality. It deduces
the coordinate transport and the azimuth transport by mean Legendre s series of the
geodesic line. This series is based on the Taylor s series, where the argument is the
length of the geodesic line. For the practical applications, it has the necessity to
effect the truncation of the series and to calculate the function error for the latitude,
the function error for the longitude and the function error for the azimuth. In this
research, these series are truncated in the derivative third and calculates the express
functions error in derivative fourth. It is described the adjustment models based on
the least-squares method: combined model with weighted parameters, combined
model or mixed model, parametric model or observations equations and correlates
model or condition equations model. The practical application is the adjustment by
mean parametric model of a traverse measured by the Instituto Brasileiro de
Geografia e Estatística (IBGE), constituted of 8 vertices and the 129.661 km length.
The localization of errors in the observations is calculated by the Baarda s data
snooping test in the last iteration of the adjustment that showed some observations
with error. The estimates of quality are in the variance-covariance matrices and
calculate the semiaxes of the error ellipse or standard ellipse of each point by means
of the spectral decomposition (or Jordan s decomposition) of the submatrices of the
variance-covariance matrix of the adjusted parameters (the coordinates). It is
important to note that the application of the Legendre s series is satisfactory for short
distances until 40km length. The convergence of the series is fast for the adjusted
coordinates, where the stopped criterion of the iterations is four decimals in the
sexagesimal second arc, where it is obtained from interation second of the
adjustment. / Ajustamento de linhas poligonais na superfície do elipsóide com os objetivos de
garantir a unicidade de solução no transporte de coordenadas geodésicas
curvilíneas (latitude ϕ e longitude λ ) e no transporte de azimute e de obter as
estimativas de qualidade. Deduz o transporte de coordenadas e o transporte de
azimute pelas séries de Legendre da linha geodésica. Essa série se fundamenta na
série de Taylor, em que o argumento é o comprimento da linha geodésica. Para as
aplicações práticas, há a necessidade de efetuar o truncamento da série e calcular a
função erro para a latitude, função erro para a longitude e função erro para o
azimute. Nesta pesquisa, trunca-se a série na derivada terceira e calculam-se as
funções erro expressas em derivada quarta. Expõe os modelos de ajustamento
fundamentados no método dos mínimos quadrados (MMQ): modelo combinado com
ponderação aos parâmetros, modelo combinado ou implícito, modelo paramétrico ou
das equações de observação e modelo dos correlatos ou das equações de
condição. A aplicação prática é o ajustamento pelo modelo paramétrico de uma linha
poligonal medida pelo Instituto Brasileiro de Geografia e Estatística (IBGE),
constituída de 8 vértices e de comprimento igual a 129,661 km. A localização de
erros nas observações é efetuada pelo teste data snooping de Baarda na última
etapa do ajustamento que mostrou algumas observações com erro. As estimativas
de qualidade estão nas matrizes variância-covariância (MVC) e calcula-se os semieixos
da elipse dos erros (ou elipse padrão) de cada ponto mediante a
decomposição espectral (ou decomposição de Jordan) das submatrizes da MVC dos
parâmetros (as coordenadas) ajustados. Mostra-se que a aplicação das séries de
Legendre é satisfatória para distâncias curtas até 40km. A convergência da série é
rápida para as coordenadas ajustadas, onde o critério de parada das iterações seja
quatro decimais do segundo de arco em que se atingiu na segunda etapa do
ajustamento.
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Analýza přesnosti výsledků astronomického určení polohy / Accuracy Analysis of Astronomical Positioning ResultsJalovecký, Martin January 2012 (has links)
This diploma thesis is focused on the analysis of results accuracy of astronomical positioning. It describes observation methods and the latest surveying systems used in geodetic astronomy. Further in the thesis there is the description of surveying system MAAS-1. Subject of the elaboration is the data obtained by measuring with this system. Testing is focused on digital camera. There is also an analysis of the results of geographical coordinates, depending on the accuracy of determining the angled pixel size and also on the accuracy of the input coordinates.
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GIS-based Episode Reconstruction Using GPS Data for Activity Analysis and Route Choice Modeling / GIS-based Episode Reconstruction Using GPS DataDalumpines, Ron 26 September 2014 (has links)
Most transportation problems arise from individual travel decisions. In response, transportation researchers had been studying individual travel behavior – a growing trend that requires activity data at individual level. Global positioning systems (GPS) and geographical information systems (GIS) have been used to capture and process individual activity data, from determining activity locations to mapping routes to these locations. Potential applications of GPS data seem limitless but our tools and methods to make these data usable lags behind. In response to this need, this dissertation presents a GIS-based toolkit to automatically extract activity episodes from GPS data and derive information related to these episodes from additional data (e.g., road network, land use).
The major emphasis of this dissertation is the development of a toolkit for extracting information associated with movements of individuals from GPS data. To be effective, the toolkit has been developed around three design principles: transferability, modularity, and scalability. Two substantive chapters focus on selected components of the toolkit (map-matching, mode detection); another for the entire toolkit. Final substantive chapter demonstrates the toolkit’s potential by comparing route choice models of work and shop trips using inputs generated by the toolkit.
There are several tools and methods that capitalize on GPS data, developed within different problem domains. This dissertation contributes to that repository of tools and methods by presenting a suite of tools that can extract all possible information that can be derived from GPS data. Unlike existing tools cited in the transportation literature, the toolkit has been designed to be complete (covers preprocessing up to extracting route attributes), and can work with GPS data alone or in combination with additional data. Moreover, this dissertation contributes to our understanding of route choice decisions for work and shop trips by looking into the combined effects of route attributes and individual characteristics. / Dissertation / Doctor of Philosophy (PhD)
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