L'école nationale des sciences géographiques (ENSG)
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Object Design and Generalization of Topographic Information

COGIT stands for Object-Oriented Design, Generalization of Topographic Information and Cartography and basically studies issues relating to the use of vectorial topographic data.


COGIT designs products (maps, data sets) or provides services in response to particular demands. We study how to improve the automation of processes and help define the expression of needs which must be translated into queries directed to these data sets and processes. This requires some reflection to suggest improvements to be introduced at different levels. On the resource side (databases and processing on the right), it is a question of better automating the analysis, consistency and modification of geographic data. On the server side (interfacing, in the center), it is about describing resources and developing methodologies based on the articulation between the system and the end-user to more closely suit the end-user’s needs (on the left) in terms of available resources (on the right).

The problem of access to geographic data adapted to end-user needs is huge. It implies not only that efforts must be made in structure (so that the server can physically obtain access to the databases and the processing) but also that certain geographic applications be studied and made accessible. We explore the following 5 areas applied to GIS :

- data extraction queries in relation to database organization,
- guided legend generation and automated analysis of data symbol legibility,
- automatic generalization for map production or data set production requiring a change in the level of detail as in zooms.
- automatic data integration from multi-source and multi-resolution data,
- topographic data analysis in the fields of natural risks and prevention.

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