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Naprocházku.cz - Web Service for Neighbour Walks
Špaček, Jiří ; Herout, Adam (referee) ; Szőke, Igor (advisor)
Nowadays the sharing of the experiences by the internet is very popular and that was the reason for establishment of service that aims to facilitate visitors to share their favorite walks. This work describes the design and implementation of application that will be able to offer this. As a major element of the display is used the Google Maps. The implementation is an own open application interface to communicate with mobile applications. To view tips for the walks is used an actual geographic location of the visitor. The work deals with the monitoring behavior of visitors working with this applivation as well. It is achieved interesting reresults. In the future there is a plan to expansion the application to keep the existing users and gaining new.
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Geolocation in Internet using latency measurements
Harth, Petr ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This diploma thesis is concerned with practical realization of CBG (Constraint-based Geolocation) algorithm, which is one of the IP (Internet Protocol) geolocation technique. IP geolocation determines the localization of a computer workstation location on the basis of on its IP address. The factors causing delays in data transfer are discussed first, followed by discussion of the issue of measuring these delays. The detailed explanation of IP geolocation follows where its contexts as well as the active geolocation techniques (techniques based on delay measurement mentioned above) are described. After that a brief description of PlanetLab experimental network, which was used for geolocation techniques measuring, is presented followed by a section explaining the creation of reference points and targets, which are another necessary prerequisite for practical realization of the method. Then the practical realization is explained in the form of CBGfinder program and its verification on the basis of artificial input data along with an actual example of IP geolocation of a point in the Internet are provided. Last but not least the measurement results of CBG algorithm are introduced, based on the analysis of Bestline parameters of one of the PlanetLab nodes measured in the period of one month, followed by a discussion of the inaccuracy of geological position and the computation speed. The cumulative distribution function as well as the kernel density estimation are also described. Final part of the thesis consists of discussion on measured results compared to results of other geological techniques results implemented by colleagues of the author of this diploma thesis. The results are compared on the basis of average inaccuracy of geological position estimations and its median, computation time, cumulative distribution function and kernel density estimation are also taken into regard.
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Visual Geolocation of a Stationary Camera
Šimurda, Pavel ; Španěl, Michal (referee) ; Herout, Adam (advisor)
Tato práce se zabývá a analyzuje možnosti, kterými je možno zjistit geografickou polohu ze snímků nebo videa pouze za použití vizuální informace z obrazu. Výsledkem práce jsou dvě rozdílné metody geo-lokalizace. První z nich pracuje na principu hledání časů východu a západu Slunce. Hlavní výhodou této metody je její univerzálnost. Funguje s jakoukoliv kamerou umístěnou v externích prostorech a nevyžaduje přítomnost žádných specifických objektů ve scéně. Pro správný výsledek je třeba alespoň celodenní záznam z kamery. Výsledky jsou uspokojivé za každého počasí. Druhá metoda pracuje na základě analýzy stínů ve scéně. Správnou pozici je možno určit, s poměrně velkou přesností, pouze na základě dvou snímků pořízených v různém čase. Tato metoda vyžaduje přítomnost dvou objektů v obraze, které vrhají stín. Přesnosti výsledků navržených metod jsou vyhodnoceny a porovnány. Z výsledků vyplývá, že obě metody lze úspěšně použít pro odhad geografické polohy. Dále byla v rámci práce pořízena rozsáhlá datová sada obrazových sekvencí z volně přístupných webových kamer.
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Estimation of the IP station location based on the parameters of network traffic
Ripper, David ; Komosný, Dan (referee) ; Verner, Lukáš (advisor)
This bachelor’s thesis covers the topic of evaluation of the geographical location of stations on the Internet with the help of measurements of the delay and implementation of the CBG method, which embodies both theoretical and practical parts of the bachelor’s thesis. The first part of this thesis is dedicated to passive geolocation methods, types of delays in data network, and their subsequent measurement. The second part pursues active geolocation methods, specifically the CBG method. Aim was to program a localization algorithm in the programming language PHP, subsequently evaluate accuracy of the method and compare with available methods IP geolocation.
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Multi-platform development of geolocation application
Pinkava, Marek ; Komosný, Dan (referee) ; Pospíšil, Aleš (advisor)
This thesis deals with development possibilities of multi-platform geolocation applications using modern web technologies. The introduction is offered a summary of available mobile platforms development opportunities for them. Follows the description of web technologies suitable for application development. Another chapter is devoted with methods of geolocation and their possibilities and limitations. After is described the implementation a specific application of selected technologies. The outcome of this thesis is fully working multiplatform application developed in order to help students to easy navigation between important places of faculty.
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Localization of IP stations based on model of probability delay measurement
Tropp, Peter ; Komosný, Dan (referee) ; Verner, Lukáš (advisor)
The master thesis is dealing with Internet host localization methods, more exactly with determining geographical position of the unknown Internet host connected to the network using RTT delay measuring. The first part is dealing with description of RTT delays that may occur in the network and tools for their measurement. The next is part of thesis is devoted to description of two kinds of localization methods. Ones that are using existing data to determine the position of Internet host also called passive methods, and others that are using RTT delay measurement, also called active methods. The main part is focused on GeoWeight method which is based on geographical localization estimation of Internet host. It is based on RTT delay measurement using the principles of CBG method, enhanced by introduction of the theory of weights according to the probability of the target Internet host. The last part is describing the application that was made to determine the geographic localization of the target Internet host using GeoWeight method. The application was afterwards tested by measuring RTT delay in PlanetLab experimental network. At the end the final measured results were compared with other localization methods (CBG, Octant, SOI, GeoIP).
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Naprocházku.cz - Web Service for Neighbour Walks
Kluska, Martin ; Glembek, Ondřej (referee) ; Szőke, Igor (advisor)
In this bachelor thesis we are going to describe the process of creation of a new web portal for sharing of tips for walks. The website is written in PHP using Nette framework. The goal of this application is to create user friendly interface for adding new walks and upgrade it with automatic retrieval of information about the walk surroundings from publicly accessible databases.
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Geolocation of Internet nodes based on communication latency
Horák, Michael ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This thesis covers the topic of determination of geographical location of a host in internet network while utilizing measurement of the end to end delay and implementation of Constraint-Based Geolocation. Gradually I go through issue of the delay in computer networks and ways how to measure it. Next chapter describes a few ways to geolocate host in internet network with emphasis on the CBG method. Another chapter is dedicated to describing a way to project spherical coordinates to the two dimensional space, which has been used in implementation of geolocation method. Chapter about implementation builds upon the facts given in previous chapters while functions of the program written in the JAVA programing language are being explained. Two similar geolocation methods were implemented. By comparing the results gained by implementation, new method of geolocation is proposed and devised. It combines properities of both previous methods. There are results of the implemented methods and their comparation to the one of the source documents used in creation of this thesis in summary section.
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Location of Internet nodes
Janoušek, Jiří ; Křupka, Aleš (referee) ; Komosný, Dan (advisor)
The aim of this thesis is to determine the geographical position of the stations on the internet using publicly available geolocation databases. The theoretical part describes different methods and aplications used for the geolocation. The next part is dedicated to the describtion of the applied databases in more details. The practical part includes the process of developing of the functions necessary to locate the stations. The conclusion consist of the evaluation of the database‘s accuracy and the comparison of applied databases.
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Extraction of information from web pages
Caha, Tomáš ; Burget, Radim (referee) ; Komosný, Dan (advisor)
This thesis deals with the separation of information from websites of selected geolocation services. Methods of geographical location of network devices and amount of available data provided by chosen freely accessible geolocation databases. The data are summarized with focus on methods of obtaining information about IP addresses from APIs of particular databases. In the paper there are also presented ways used to develop the system for automatic estimation of geographic location of IP addresses specified in source file and process of comparing retrieved data with reference data. The system is created in Python and provides a simple way for verifying information about given IP addresses in five freely accessible databases. Furthermore, accuracy of the retrieved data is evaluated and five geolocation databases is compared.
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