STRATEGY FOR EXTRACTION OF FOURSQUARE’S SOCIAL MEDIA GEOGRAPHIC INFORMATION THROUGH DATA MINING

This aim of this paper is the acquisition of geographic data from the Foursquare application, using data mining to perform exploratory and spatial analyses of the distribution of tourist attraction and their density distribution in Rio de Janeiro city. Thus, in accordance with the Extraction, Transformation, and Load methodology, three research algorithms were developed using a tree hierarchical structure to collect information for the categories of Museums, Monuments and Landmarks, Historic Sites, Scenic Lookouts, and Trails, in the foursquare database. Quantitative analysis was performed of check-ins per neighborhood of Rio de Janeiro city, and kernel density (hot spot) maps were generated The results presented in this paper show the need for the data filtering process — less than 50% of the mined data were used, and a large part of the density of the Museums, Historic Sites, and Monuments and Landmarks categories is in the center of the city; while the Scenic Lookouts and Trails categories predominate in the south zone. This kind of analysis was shown to be a tool to support the city's tourist management in relation to the spatial localization of these categories, the tourists’ evaluations of the places, and the frequency of the target public

A Integração dos Módulos de Geração do Modelo Digital de Elevações e de Restituição Digital no Projeto E-FOTO

This paper presents the improvement and integration of Stereoplotter and Digital Elevation Model Generation (DEM) modules from E-FOTO project, which are responsible for the 3D reconstruction part in the photogrammetric process. The Stereoplotter module was developed aiming at digitizing 3D cartographic features from aerial stereopairs. In this module, the student can create, edit and save points, lines or polygons which will be used later in DEM module as break-lines. Some significant improvements were made in this module, like directly image zooming, maximizing the screen and the possibility of editing end fixing points. Moreover, several bugs were found and fixed. The DEM module was designed to generate the digital terrain model or digital surface model which can be performed by measuring points in a user pre-defined GRID or by the interpolation of 3D points measured previously in the Stereoplotter module. An additional image showing the 3D extracting results was added, therefore no 3D viewing engine was developed. Nevertheless, the results of 3D extraction can be exported to Octagon or Matlab for 3D viewing. In order to analyze the accuracy of E-FOTO 3D measuring, we performed a comparison between two sets of 3D points generated from 2D corresponding points from E-FOTO and from Erdas LPS 9.3. The results shown, at 99% of confidence level, that are no significant differences between both software platforms.Pages: 2422-242