Chehreghan, A. R.
Faculty of Mining Engineering Sahand University of Technology
[ 1 ] - Improvement of the Effective Components in the PDR Positioning Method Based on Detecting the User’s Movement Mode Using Smartphone Sensors
The purpose of this paper is to evaluate and improve the accuracy of indoor positioning using smartphone sensors based on Pedestrian Dead Reckoning (PDR) method. In some specific situations, such as fires or power outages that disable infrastructure-based positioning techniques, using PDR method based on smartphone sensors that perform positioning continuously is a good solution.This paper focu...
[ 2 ] - Analytical Comparison of Methods for Calculating the Completeness of VGI
Spatial data, which is one of the main needs of human societies from business organizations to the general users today, cannot meet the needs of a wide range of users without changing the structure of conventional methods of data registration and updating on a metropolitan scale. Open Street Map, as one of the most successful implementations of the crowdsourcing approach to spatial data with th...
[ 3 ] - An Evaluation of Infrastructure-free and Infrastructure-based Indoor Positioning Methods with the Focus on Pedestrian Dead Reckoning
The expansion of location-based services (LBS) and their applications has led to a growing interest in localization, which can be done on the smartphone platform. Various positioning techniques can be used for indoor or outdoor positioning. Indoor positioning systems have been one of the most challenging technologies in location-based services over the past decade. Considering the increase of p...
[ 4 ] - Assessment of the completeness of Volunteered Geographic Information focusing on building blocks data (Case Study: Tehran metropolis)
Open Street Map (OSM) is currently the largest collection of volunteered geographic data, widely used in many projects as an alternative to or integrated with authoritative data. However, the quality of these data has been one of the obstacles to the widely use of it. In this article, from among the elements related to the quality of volunteered geographic data, we have tried to examine the com...
[ 5 ] - Matching of Polygon Objects by Optimizing Geometric Criteria
Despite the semantic criteria, geometric criteria have different performances on polygon feature matching in different vector datasets. By using these criteria for measuring the similarity of two polygons in all matchings, the same results would not have been obtained. To achieve the best matching results, the determination of optimal geometric criteria for each dataset is considered necessary....
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