SbornÃk abstraktÅ¯ a pÅÃspÄvku z 20. kartografickÃ© konference

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Web client for PostGIS – the concept and implementation Jan Ježek, Michal Kepka {jezekjan, mkepka}@kma.zcu.cz (Západočeská univerzita v Plzni) Fast and online visualisation of complex SQL queries, that includes spatial content without any scale limitation, is challenge that can be hardly fulfil with software tools that are available nowadays. PostgreSQL with PostGIS plays a role of flagship of Open Source RDBMS but there is just limited possibility of simple and fast queries visualisation. Widely used GIS applications offer certain solutions, but their approach have some limits and can be seen as too complex. We have designed the concept and implementation of software that will make output of SQL queries available through web services. KML format was chosen as output data format as it is most common format in the Internet environment. We have also designed mechanisms that helps to simplify the output data so that even large scale results can be easily cartographically visualised. Server-side Java application with REST API has been implemented for that propose. The application accepts user’s SQL query, executes it in the database and provide the HTTP service with results in KML format. Such KML is recursively generated according to bounding box of user request and provides relevant level of detail of particular data. 14
Benefits of the developed application is in simple access and straight forward visualisation with the utility of SQL together with comprehensive list of spatial functions available in PostGIS. The developed application can be useful for data mining and analyses as well as for education proposes in the field of the spatial databases. Acknowledgements: “NTIS – New Technologies for the Information Society”, European Centre of Excellence, CZ.1.05/1.1.00/02.0090. 15
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SbornÃ­k abstraktÅ¯ a pÅÃ­spÄvku z 20. kartografickÃ© konference

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SbornÃk abstraktÅ¯ a pÅÃspÄvku z 20. kartografickÃ© konference