Czasopismo | PRZEGLĄD TELEKOMUNIKACYJNY - WIADOMOŚCI TELEKOMUNIKACYJNE | Rocznik 2016 - zeszyt 7

Cache service for maps presentation in distributed information data exchange system

10.15199/59.2016.7.2

nr katalogowy: 99673
10.15199/59.2016.7.2

The paper presents the proposition of caches implementation for map presentation in distributed information data exchange system. The concept of cache service is described in the context of distributed information data exchange system elements which control and present on maps positions and other identification data of vessels and other suspicious objects on the territorial sea, sea-coast and the internal sea-waters. The proposed cache service is implemented to decrease response time of the MapServer (a part of the system) to console (mobile or stationary) queries for map data. Since cache service limits the number of SQL queries processed by the databases that store data used in the system, the presented solution improves their performance. The paper presents the general architecture of the data exchange system and the cache concept. The cache service implementation is briefly presented on the basis of information flow diagrams in distributed information system architecture. Moreover, results of main functional tests of cache service are described. Key words: cache service; distributed database; map presentation; identification data presentation.1. Introduction The land and blue border surveillance is essential for safety of each country. For this reason very helpful are systems which develops and distributes complex surface image covering of the territorial sea and the internal sea-waters (for example [1]). Using such a system authorized services can observe the usage of sea-waters, controls the suspicious vessels, detects undefined surface objects, participates in Search and Rescue operations. Such a system also improves protection against illegal immigration, goods smuggling. In the paper we consider a system composed of centers: Main Control Centre (CON), Reserve Control Centre (ZCON), Division Control Centers (DONs), Local Control Centers (LONs) and Observation Posts (OPs) distributed along the coastline. Additional par[...]

Bibliografia

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[5] Czaplewski Bartosz, Sylwester Kaczmarek. 2015. "Data visualization on maps (MapControl)". Report of project DOBR/0022/R/ID1/2013/03. PG WETI, Gdańsk, Poland (in Polish).
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