Spatial filters implementation for Geo2Tag LBS platform

Location-based services became more and more widespread because of popularity mobile phones with positioning functions. Today support of 3d objects became main trend in such services development. Navigation systems and search services for huge buildings is only one example of using this feature. This article describes 3d objects and filters support implementation in Geo2Tag platform

"Accessibility Map" and "Social navigator" services for persons with disabilities

The paper describes development process of information environment for persons with disabilities. Introduction describes the aim and objectives of development, the results of evaluation of typical demands and user scenarios for persons with disabilities. The first section of the main part describes common applications architecture and utilized technologies. Both services use the same data model, which includes description of route parts and roads, as well as information about accessibility of objects stored in the database of “Accessibility Passports” service developed previously. The next section contains description of the development process. The user scenarios, service functions, the use of Geo2Tag platform and Open Street Map with its libraries are presented. In “Social navigator” service the routes are described as a graph with weighted edges, where the weight is the rate of accessibility of the path parts. The mathematical method for estimation of accessibility according to various types of ability restrictions was developed and implemented in the service. The method is based on graph theory and provides an approach to formal ranging of the routes according to the accessibility level of persons with limited mobility

Geo2Tag performance evaluation

Today volume of the Internet traffic growths very fast. This trend affects Web-application, with the number of users and amount of traffic also increasing their workload. That's why developers need to achieve maximum performance on existing hardware. Software optimization allows solving this problem. Geo2Tag is an open source platform for location-based services (LBS), which provide web interfaces for them. Initially, it was developed as an educational project which goal was to give students experience in open source projects development. But now number of supported functions and number of users (users of LBS and developers) for platform is increasing, and in this situation platform performance is not enough. This paper describes Geo2Tag platform performance evaluation and optimization

"Accessibility passports" service in information environment for persons with disabilities

The paper describes development process of information environment for persons with disabilities. Introduction gives a base understanding of the project idea. The first section of the main part describes common infrastructure architecture. Services are divided on government and public. The public part is presented by various services, based on the information collected by government service. Government service is presented by information system “Accessibility passports”, which in details is described in second section of main part. The “Accessibility passports” is a service for initial collection of data about accessibility of the social infrastructure facilities for people with disabilities. In the last section of the main part presented a mathematical method for measuring level of accessibility of the social infrastructure facilities for people with disabilities. Method is based on probability theory and provide possibility for formal ranging of the social infrastructure facilities according to the level of accessibility for persons with limited mobility

Geocontext extraction methods analysis for determining the new approach to automatic semantic places recognition

Goal of this paper is to determine actual trends in geocontext extraction methods and to understand which types of geocontext information are the most interesting for users. For this purposes comparison of recent researches about geocontext analysis was done. Researches were compared by the type of achieved result, used formalism, source data and limitations. As the main result of comparison new approach for automatic semantic places recognition was proposed. This approach is based on geotags markup with semantic user-defined tags. The solution allows extracting information (coordinates and a set of corresponding semantic tags on the natural language) about locations which are interesting for the location-based services users. The main advantage of the approach is its simplicity - the method does not rely on any syntax analysis algorithms during the semantic labeling stage. For illustrating the approach an example of the general purpose accidents monitoring service for the Geo2Tag platform was described