Abstract
The development of a web-based Geographic Information System for mass property valuation was the main focus of this research. The developed web GIS allows effective dissemination, extraction and analysis of mass land valuation information over the Internet. It also allows for automation of the mass property valuation process by compiling a centralized mass valuation roll database. The Westlands Constituency, one of the administrative regions of the Nairobi City County was used as a case study. The research focused on automation of the mass property valuation roll by creating a centralized database that is accessible by all users on the web-based GIS portal. This was done by customizing and integrating a web-based GIS system based on open source QuantumGIS, GeoServer and PostgreSQL/PostGIS as a relational database. Leaflets APIs were used for the development of an interactive and friendly geographic user interface. The developed system enables users to view and interact with the spatial data. This improves the efficiency and effectiveness of the decision making process and data sharing for mass property valuation and optimal property taxation purposes.
Highlights
Open Source Centralized Spatial Database Establishment of centralized mass property valuation database shown by section of the database in Table 3 improves reliability and update speed of the mass valuation roll
The study led to the development of a Web-based Geographical Information system for mass property valuation roll database
The system offers a streamlined flow of land valuation information by having centralized database system accessible to all ensuring there is well structured process of collecting, storing and disseminating property valuation related information
Summary
Availability of a central sales register and confidentiality of land information facilitates property valuation by the county authority for the purposes of property taxation based on their property values It is a constitutional requirement in the Kenyan constitution valuation for rating Act Cap-266 laws of Kenya that allows the preparation of the mass valuation roll after every 10 years so as to generate the significant revenue from these properties [4]. This has not been the case for Nairobi City County which continues to rely on a mass valuation roll that was last prepared and updated in 1980. Efficient and effective preparation of the mass valuation roll and subsequent optimal land taxation depends upon the availability of quality and correct land attributes information [5]
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