Official road classification is used for general purposes but for deep traffic analysis this classification is not sufficient. Today there are efficient ways to collect large amounts of data from multiple sources that can be used for different causes. These large amounts of data cannot be analysed with traditional methods and new state-of-the-art algorithms should be used.
The paper presents the methodology for urban road classification based on GPS (Global Positioning System) vehicle tracks and data on infrastructural characteristics of road subsegments. The process of defining road categories includes data collection and analysis, data cleansing and fusion, multiple regression, principal component analysis (PCA) as well as cross-validation and k-nearest neighbour (kNN) classification procedure. Results of such continuum can be used as base for further traffic analysis as travel time prediction, optimal route detection etc.
Automatic Identification System (AIS) is used for security of ships and ports, their identification and protection of marine environment. Correct installation of AIS device and integration with navigation equipment is of great importance for the correct functioning of the system. To increase system accuracy correct input of data to the system is significant. Correct data interpretation depends on seafarer’s ability to recognize errors. In order for the seafarer to get acquainted with the system as well as its advantages and disadvantages high-quality seafarer’s training in the use of AIS is of utmost importance. AIS is not a navigation aid, nevertheless it can be used as a device to facilitate navigation. In this paper the authors are analysing AIS errors and proposing measures for improvement of its functioning.
Universal service providers have an obligation to provide a minimum required set of postal services – known as universal service obligation. To ensure universal service obligation, regulatory measures (criteria) which service providers must fulfil are often set up. In this paper, a geographical analysis of these criteria is conducted using current regulatory framework in the Republic of Croatia as an example. Based on the framework of the gravity model, accessibility of postal service is presented. The goal of the proposed research is to investigate the application of the gravity model for determining postal service accessibility, with special emphasis on rural areas. To our knowledge, this method has not been used in previous studies to determine accessibility of postal services. The results of the applied model could be used in future planning of access density criteria with various transportation modes.
The efficiency of the public urban transportation system depends on the identification of relevant parameters and their weights, which directly or indirectly influence the quality of urban traffic. Based on the preferences of decision-makers, it is necessary to consistently determine the significance of criteria, compare the strategies, and determine the one used in decision-making. This paper presents a model of multiple criteria decision-making based on the analytical hierarchical model with the aim of improving the efficiency of the public urban transportation system.
Accessibility of postal access points is an important part that service providers, as
well as regulatory bodies should consider when planning postal network capacities.
This is important for the provision of the universal postal service. In this
paper, accessibility of post offices is determined by the application of the Two
Step Floating Catchment Area method (2SFCA). Geographic Information System
(GIS) was used for spatial analysis of postal network, locations, calculation of
distances, application of the method and presentation of the results. The current
regulatory framework is validated by using catchment area derived from the regulatory
criterion.
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