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UNIGIS Abschlussarbeiten


Der krönende Abschluss eines UNIGIS MSc Studiums ist sicherlich die Master Thesis. Mit ihr belegen unsere MSc-AbsolventInnen, dass sie den akademischen Grad "Master of Science (Geographical Information Science & Systems)" zu Recht führen.  Im UNIGIS professional Studiengang muss keine Abschlussarbeit verfasst werden. Dennoch nehmen einige Studierende die Möglichkeit war, ein Geoinformatikprojekt durchzuführen und entsprechend zu dokumentieren.

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Katja Neubarth [12-2010]:

„Miles of Tiles“ Tessellation in Geoinformatics

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essellation in all its aspects plays an important yet largely hidden part in geoinformatics. This thesis aims to shed light on the basics, methods and applications of tessellation. Tiling, as tessellation is sometimes called, provides the base for primary data structures such as raster data, tiled raster maps and digital elevation models. Concepts based on tessellation play an important part in secondary data structures which are used in spatial databases as well as in raster datasets. The thesis gives an overview of the basic concepts of tessellation. This involves dierent scientic disciplines: mathematics, computer science and information theory as well as geographic information science. The fundamental root of tessellation lies in mathematics, with geometry providing basic terms and denitions. Computer science comes into play with image processing methods and algorithms to produce, store and access tiles. Above all geographic information science provides the common denominator for all these disciplines and adds some ingredients of its own, namely spatial access methods, spatial reference systems and georeferencing. These concepts and many practical applications in the field of geoinformatics. Some of the best known and fastest map services on the Internet (such as Google Maps and Bing Maps) are based on tiled raster maps. They provide an easy possibility to publish all kinds of maps on the Internet. As tiled raster maps have become quite popular over the last few years, efforts have been made by international organizations such as the Open Geospatial Consortium to standardize tile services. Standards such as the OGC's Web Map Tiling Service Implementation Standard address the need for open standards for tiled map services. As tiled web map services constitute one of the most popular uses of tessellation, they are given special consideration as an applications of tiles. The steps involved in generating tiles from a raster image, the actual fragmentation of the image and questions concerning storage of the finished tiles are discussed. The reassembly of tiles into a seamless map has its place as well as tile naming schemes employed by open standards and proprietary services.


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