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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
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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Integração de dados em SIG: uma abordagem por tecnologias de uso livre / GIS data integration: a free software approachNader, Ricardo Saleimen 28 September 2015 (has links)
Foi demonstrada a viabilidade de utilização da biblioteca GDAL/OGR, por meio do seu emprego em processos de conversão sintática entre formatos de dados matriciais e vetoriais controlados, amplamente utilizados nas práticas profissional e de pesquisa em Geografia, Cartografia e Geoprocessamento. Os dados convertidos e processados foram analisados comparativamente em seus parâmetros geométricos, topológicos, alfanuméricos e de referência espacial, de modo a identificar se existiram perdas ou manutenção de informações nesses indicadores. No caso da existência de perdas, foram empregados recursos disponíveis na biblioteca para ajustes nos parâmetros indicados, de modo a tentar retornar ao conteúdo de dados dos arquivos originais. Finalmente, foi apresentada uma metodologia para a superação de desafios de integração de dados geoespaciais em SIG, por meio do emprego de sistemas de uso livre no campo do Geoprocessamento. / It was demonstrated the feasibility of using the GDAL / OGR library, through its usage in syntax conversion processes between raster and vector controlled data formats, widely used in professional practice and research in Geography, Cartography and Geomatics. The translated data were processed and analyzed comparatively in its geometrical, topological, alphanumeric and spatial reference parameters in order to determine if there were any loss or maintenance information on such indicators. In the case of losses, library resources were used into the indicated parameters in order to try to return to the original data files content. Finally, we presented a methodology for overcoming geospatial data integration challenges in GIS, through the use of free softwares in the field.
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Integração de dados em SIG: uma abordagem por tecnologias de uso livre / GIS data integration: a free software approachRicardo Saleimen Nader 28 September 2015 (has links)
Foi demonstrada a viabilidade de utilização da biblioteca GDAL/OGR, por meio do seu emprego em processos de conversão sintática entre formatos de dados matriciais e vetoriais controlados, amplamente utilizados nas práticas profissional e de pesquisa em Geografia, Cartografia e Geoprocessamento. Os dados convertidos e processados foram analisados comparativamente em seus parâmetros geométricos, topológicos, alfanuméricos e de referência espacial, de modo a identificar se existiram perdas ou manutenção de informações nesses indicadores. No caso da existência de perdas, foram empregados recursos disponíveis na biblioteca para ajustes nos parâmetros indicados, de modo a tentar retornar ao conteúdo de dados dos arquivos originais. Finalmente, foi apresentada uma metodologia para a superação de desafios de integração de dados geoespaciais em SIG, por meio do emprego de sistemas de uso livre no campo do Geoprocessamento. / It was demonstrated the feasibility of using the GDAL / OGR library, through its usage in syntax conversion processes between raster and vector controlled data formats, widely used in professional practice and research in Geography, Cartography and Geomatics. The translated data were processed and analyzed comparatively in its geometrical, topological, alphanumeric and spatial reference parameters in order to determine if there were any loss or maintenance information on such indicators. In the case of losses, library resources were used into the indicated parameters in order to try to return to the original data files content. Finally, we presented a methodology for overcoming geospatial data integration challenges in GIS, through the use of free softwares in the field.
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CRAMO : Continuously Rendered Aerial Maps with Open DataHedin, Andreas January 2019 (has links)
One issue with a lot of the free aerial satellite maps that exists is the actuality of the acquired images in terms of the acquisition date. A lot of times the images are a few years old and will not represent the current reality. This project will try and mitigate this by using free open data from the Copernicus directive supplied by the European Space Agency ESA and use that to create maps. By doing this the ability to have daily updated aerial satellite maps occurs and that could be really interesting for scientific and commercial purposes. To make this work an automated process was created that downloaded the images from Copernicus and processed them with GDAL to create the maps. The process deals with the issues of mosaicing, reprojection and unattended downloads amongst other things. In the results, there is a comparison between three different maps to give a comparison and an idea of how big of a map the process can handle in a reasonable time.
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Prohlížení rozměrných rastrových geodat online / Viewing Large Raster Geodata OnlineMikita, Martin January 2015 (has links)
This thesis describes the design of a multi-platform client-server application to access large raster data, existing and proposed ways to optimize the running speed and processing raster. The advantage of the application is an updated version of GDAL for reading most known raster format, and implementing extension for reading GeoPDF with open-source PDF rendering library. Integrating created and optimized server component into the open-source project IIPImage improves it to support more raster formats.
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GIS Processing on the WebKnutsson, Erik, Rydhe, Manne January 2022 (has links)
Today more and more advanced and demanding applications are finding their way to the web. These are applications like video editing, games, and mathematical calculations. Up until a few years ago, JavaScript was the only language present on the web. That was until Mozilla, Google, Microsoft, and Apple decided to develop WebAssembly. WebAssembly is a low-level language, similar to assembly, but running in the browser. WebAssembly was not created to replace JavaScript, but to be used alongside it and complement JavaScript’s weaknesses. WebAssembly is still a relatively new language (2017) and is in continuous development. This work is presented as a guideline, and to give a general direction of how WebAssembly is performing (in 2022) when operating on GIS data. When comparing the execution speed of WebAssembly running in different environments (NodeJS, Google Chrome, and Mozilla Firefox), NodeJS was the fastest. The second fastest was Mozilla Firefox, and the slowest was Google Chrome. However, when compared to the native implementation in C++, no environment came close to the developers’ promised 10% slowdown compared to the native code. The average slowdowns found in this study were: The benchmark with small input files ran 63% slower than native. The benchmark with medium input files ran 62% slower than native, and the benchmarks with large input files ran 68% slower than native. The results are comparable to the study [6], which found that the slowdown was around 45% when running WebAssembly on Mozilla Firefox and 55% on Google Chrome with a peak of 2.5 times slowdown compared to native. This study aimed to measure memory usage in the different environments for operations on GIS data. However, the methods used in this study to measure memory proved to be too unsophisticated when dealing with JIT and garbage collection. For future work, a more detailed "memory allocated over time" graph should probably be used to be able to measure the peaks of memory currently allocated to the process instead of looking at the difference in memory before and after.
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Design and Implementation of an Out-of-Core Globe Rendering System Using Multiple Map Services / Design och Implementering av ett Out-of-Core Globrenderingssystem Baserat på Olika KarttjänsterBladin, Kalle, Broberg, Erik January 2016 (has links)
This thesis focuses on the design and implementation of a software system enabling out-of-core rendering of multiple map datasets mapped on virtual globes around our solar system. Challenges such as precision, accuracy, curvature and massive datasets were considered. The result is a globe visualization software using a chunked level of detail approach for rendering. The software can render texture layers of various sorts to aid in scientific visualization on top of height mapped geometry, yielding accurate visualizations rendered at interactive frame rates. The project was conducted at the American Museum of Natural History (AMNH), New York and serves the goal of implementing a planetary visualization software to aid in public presentations and bringing space science to the public. The work is part of the development of the software OpenSpace, which is the result of a collaboration between Linköping University, AMNH and the National Aeronautics and Space Administration (NASA) among others.
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A map system to disseminate national science on forests for the creation of regional tree planting prioritization plansWhalen, Kevin Christopher 07 December 2017 (has links)
No description available.
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An ontology-based framework for formulating spatio-temporal influenza (flu) outbreaks from twitterJayawardhana, Udaya Kumara 29 July 2016 (has links)
No description available.
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