Retrospective adaptive prefetching for interactive Web GIS applications

2012-07-01
Yesilmurat, Serdar
İşler, Veysi
A major task of a Web GIS (Geographic Information Systems) system is to transfer map data to client applications over the Internet, which may be too costly. To improve this inefficient process, various solutions are available. Caching the responses of the requests on the client side is the most commonly implemented solution. However, this method may not be adequate by itself. Besides caching the responses, predicting the next possible requests from a client and updating the cache with responses for those requests together provide a remarkable performance improvement. This procedure is called "prefetching" and makes caching mechanisms more effective and efficient. This paper proposes an efficient prefetching algorithm called Retrospective Adaptive Prefetch (RAP), which is constructed over a heuristic method that considers the former actions of a given user. The algorithm reduces the user-perceived response time and improves user navigation efficiency. Additionally, it adjusts the cache size automatically, based on the memory size of the client's machine. RAP is compared with four other prefetching algorithms. The experiments show that RAP provides better performance enhancements than the other methods.
GEOINFORMATICA

Suggestions

Real-time 2D/3D display of dted maps and evaluation of interpolation algorithms
Demir, Ali; Coşar, Ahmet; Department of Geodetic and Geographical Information Technologies (2010)
In Geographic Information System (GIS) applications, aster data constitutes one of the major data types. The displaying of the raster data has an important part in GIS applications. Digital Terrain Elevation Data (DTED) is one of the raster data types, which is used as the main data source in this thesis. The DTED data is displayed on the screen as digital images as a pixel value, which is represented in gray scale, corresponding to an elevation (texel). To draw the images, the texel values are mostly inter...
Developing a geographical information system for the gallipoli campaign
Sağlam, Ayhan; Düzgün, H. Şebnem; Department of Geodetic and Geographical Information Technologies (2005)
Geographical Information System (GIS) is a very powerful technique which is used in solving different problems in various fields dealing with spatial information. It can also be used for analyzing wars and campaign. Today̕s modern armies use GIS effectively for different purposes such as determining strategic points and planning attack and defense. GIS can also be used for past wars, and historical GIS includes these kinds of applications. In this study, GIS have been used for analyzing Gallipoli Campaign i...
Design of a web based interface and database structure for structural engineering experimental data /
Kurt, Tolga; Kurç, Özgür; Department of Civil Engineering (2014)
This study is conducted in order to design and implement a web-based database application which stores structural and earthquake engineering experimental data and related documents in a main server in a standardized manner and makes it possible for researchers and engineers to add and share experimental data easily. The system is developed in accordance with the standards defined in the scope of the SERIES project which is a project operated by a consortium consisting of related university laboratories and ...
A prefetching method for interactive WEB GIS applications
Yeşilmurat, Serdar; İşler, Veysi; Department of Computer Engineering (2010)
A Web GIS system has a major issue of serving the map data to the client applications. Since most of the GIS services provide their geospatial data as basic image formats like PNG and JPEG, constructing those images and transferring them over the internet are costly operations. To enhance this inefficient process, various approaches are offered. Caching the responses of the requests on the client side is the most commonly implemented solution. However, this method is not adequate by itself. Besides caching ...
Integration of geophysical - geological data using geographic information systems
Şirinyıldız, Tunç; Toprak, Vedat; Department of Geodetic and Geographical Information Technologies (2003)
This study attempts to integrate geophysical data with other spatial data using Geographic Information Systems (GIS). The study is carried out in a part of Galatean Volcanic Province, north of Ankara. Gravity, magnetic, topographic, rock type and volcanic eruption center data are the data layers used in the study. All data layers are converted to raster format with a grid spacing of 100 m. The first step in the analysis is the pair-wise analyses of all data layers. For the geophysical data, different layers...
Citation Formats
S. Yesilmurat and V. İşler, “Retrospective adaptive prefetching for interactive Web GIS applications,” GEOINFORMATICA, pp. 435–466, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57579.