Weighted multi-visibility analysis on directional paths

Download

index.pdf

Date

2010

Author

Şeker, Çağıl

Metadata

Show full item record

Item Usage Stats

230
views

126
downloads

Visibility analysis is an important GIS tool that is used in a diverse array of disciplines ranging from earth sciences to telecommunications. Multi-visibility, as a cumulative type of visibility, combines many point-to-point results into a multi-value array. Points, lines, or areas can be used as sources or targets; and the combined values can be calculated in both ways. Through multi-visibility, a special 2.5D visibility value surface can be constructed over a digital elevation model. The effectiveness of multi-visibility can be increased with weighted target zones. Other types of weighting criteria can be defined, such as distance and angle. Open source GIS tools offer a limited amount of support for that type of multivisibility analysis. In this study, a weighted multi-visibility methodology has been developed which accepts a path as the source. The path can have a specific direction to account for moving subjects that have a specific view angle based on their direction. A software tool has been developed to apply the methodology in a practical and automated way. The tool was written in Python programming language and can be run as a plugin to the open source Quantum GIS software. The proposed weighted multi-analysis methodology and its software tool can be used to assess the quality of visibility through the generation of value surfaces and calculation of a combined quantitative visibility value for the full path.

Subject Keywords

Geographic information systems.

URI

http://etd.lib.metu.edu.tr/upload/12612843/index.pdf
https://hdl.handle.net/11511/20219

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Development of GIS-based national hydrography dataset, sub-basin boundaries, and water quality/quantity data analysis system for Turkey Girgin, Serkan; Usul, Nurünnisa; Akyürek, Zuhal; Department of Geodetic and Geographical Information Technologies (2003) Computerized data visualization and analysis tools, especially Geographic Information Systems (GIS), constitute an important part of today̕s water resources development and management studies. In order to obtain satisfactory results from such tools, accurate and comprehensive hydrography datasets are needed that include both spatial and hydrologic information on surface water resources and watersheds. If present, such datasets may support many applications, such as hydrologic and environmental modeling, imp...
A topological system for codification of river basins in Turkey Ulucan, İbrahim; Akyürek, Sevda Zuhal; Department of Geodetic and Geographical Information Technologies (2021-6-23) Recently, owing to incredible development in Geographic Information Systems (GIS) and software fields, besides effectively using the network and topology instruments, great advances have been made in the field of hydrologic coding through robust interaction among multidisciplinary sciences. If all hydrological properties can be combined in a network that has its own sui generis situation and topological properties, meaningful and holistic analyses can be formed more easily. Additionally, GIS topology is an ...
Development of free/libre and open source spatial data analysis system fully coupled with geographic information system Kepoğlu, Volkan Osman; Düzgün, H. Şebnem; Department of Geodetic and Geographical Information Technologies (2011) Spatial Data Analysis (SDA) is relatively narrower and constitutes one of the areas of Spatial Analysis. Geographic Information System (GIS) offers a potentially valuable platform for supporting SDA techniques. Integration of SDA with GIS helps SDA to benefit from the data input, storage, retrieval, data manipulation and display capabilities of GIS. Also, GIS can benefit from SDA techniques in which the integration of these techniques can increase the analysis capabilities of GIS. This integration serves fo...
Process based information systems evaluation: Towards the attributes of "pRISE" Özkan Yıldırım, Sevgi; Bilgen, Semih (2007-10-31) Purpose The purpose of this paper is to demonstrate the importance of undertaking a systemic view of information systems evaluation that augments the frequently reported prescriptive (cost/benefit) analysis approaches. Design/methodology/approach The paper adopts a qualitative case perspective and derives a framework for substantive information systems evaluation factors (PRISE). Three empirical formulations are considered and a comparison made to determine the content and context of the findings. Finding...
Improved viewshed analysis algorithms for avionics applications Özkıdık, Mustafa; Koçyiğit, Altan; Department of Information Systems (2019) Viewshed analysis is a common GIS capability used in various domains with various requirements. In avionics, viewshed analysis is a part of accuracy critical applications and the real time operating systems in embedded devices use preemptive scheduling algorithms to satisfy performance requirements. Therefore, to effectively benefit from the viewshed analysis, a method should be both fast and accurate. Although R3 algorithm is accepted as an accuracy benchmark, R2 algorithm with lower accuracy is preferred ...

Citation Formats

Ç. Şeker, “Weighted multi-visibility analysis on directional paths,” M.S. - Master of Science, Middle East Technical University, 2010.