Wyniki wyszukiwania - BazTech

1

Wykorzystanie oprogramowania ArcGIS w analizie widoczności kamer projektowanego monitoringu osiedlowego

Dębińska E., Zaleski S.

Roczniki Geomatyki

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2016

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T. 14, z. 3(73)

287--294

PL

Monitoring wizyjny (ang. CCTV - Closed Circuit Television) stosowany jest w Polsce od lat 70. XX wieku. Początkowo wykorzystywany był w obiektach, charakteryzujących się wysokim współczynnikiem drobnej przestępczości tj. kradzieże, pobicia. Obecnie trudno znaleźć miejsce w przestrzeni publicznej, które nie jest monitorowane. Z monitoringu korzystają instytucje publiczne, zarządy dróg, wspólnoty mieszkaniowe, prywatni właściciele. Jednak by monitoring był efektywny, konieczna jest wnikliwa analiza lokalizacji kamer już na etapie projektu. Wykorzystując zaawansowane narzędzie GIS oraz mając do dyspozycji urządzenie w postaci kamery o ustalonych parametrach w zakresie: wysokości kamery nad powierzchnią ziemi, nachylenia górnej osi granicy widoczności, nachylenia dolnej osi granicy widoczności oraz maksymalnego zasięgu widoczności kamery, jesteśmy w stanie wyznaczyć obszary, które znajdą się w zasięgu jej pracy. W artykule przedstawiono możliwości wykorzystania oprogramowania ArcGIS w analizie widoczności kamer projektowanego monitoringu. Prace wykonano dwutorowo: na danych rastrowych w środowisku 2D oraz na danych wektorowych w środowisku 3D. Zaprezentowano zbudowane narzędzie służące do automatyzacji wyznaczania obszarów widoczności z projektowanych kamer. Omówiono wady i zalety każdego z rozwiązań oraz zaprezentowano wyniki końcowe z dwóch metod. Zaproponowano model hybrydowy ze schematem działania do rozwiązania problemu projektowania monitoringu osiedlowego.

EN

The Closed Circuit Television (CCTV) have been used in Poland for over 40 years. Initially it was used in places with the high rate of petty crime. Currently, it is difficult to find a spot in public space, which is not monitored. Monitoring is used by public institutions, road administrations, residential communities or private landlords. However, if monitoring is to be effective, a thorough analysis of camera locations at the design stage is required. Using advanced GIS tools, and a camera of specified parameters such as the height above the ground, the slope of the upper and bottom limits of visibility axes, the camera maximum visibility range, we are able to determine areas visible for the device. The paper presents the possibility of using ArcGIS software to analyze visibility of industrial cameras for the planned monitoring system. The work was performed in two ways: for 2D raster data and for 3D vector data. A tool, constructed for the needs of automatic determination of visible areas was presented. Advantages and disadvantages of each solution, as well as the final results for both methods were presented. A hybrid model, including an operational scheme for designing a housing estate monitoring system was also proposed.

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The methods of performing the viewshed analyses on inland waters for complex objects

Łubczonek J.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2013

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nr 35 (107)

97--102

EN

Observational sensors, such as CCTV cameras and radars, are part of the RIS system. These sensors should provide information about the current situation on the waterway and to a greater extent – aquatory. Barriers for the observational sensor, in the sense of reducing the view field, are various objects in the aquatory. This is one of the main factors that make it difficult to determine the proper location of the sensor. Currently, in order to increase the efficiency of determining the locations of the observational sensors are used different tools for performing spatial analysis. This applies to both the initial geographical identification as well as detailed analysis. Analysis efficiency, in turn, depends on the model of the environment, represented in the form of the Digital Surface Model. Given the complexity of some geographic features, it should be used the appropriate methodology for the visibility analysis, as well as the preparation of the input material. The following work includes the theme of visibility analysis on inland waters, with special emphasis on the complex objects. They include bridges, cranes, buildings, high vegetation and other engineering structures.

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The accuracy of determination of radar shadows

Łubczonek J.

Annual of Navigation

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2012

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No. 19, part 2

41--52

EN

Currently, the GIS software is often used to perform various tasks related to spatial planning. Exemplary use of GIS techniques is determination of marine radar shadows. Such analysis can be helpful during creating surveillance systems, which generally consist of several radar stations. But the use of standard analysis tools with the default functionality may not always yield satisfactory results. The reason for this, in the case of radar sensors, is the image distortion caused by the characteristics of the radar beam. This paper presents a modified method for the visibility analysis, which includes two basic radar image distortions - angular and radial distortion. Such improvement gives much more accurate results during determination of radar shadows then application of standard methods of viewshed analysis. Presented method was verified in the aspect of accuracy by using real radar image and radiolocation target. Further accuracy study took into consideration different DSM models used to perform viewshed analyses.