UNIVERSITY OF NAIROBI

Transcription

1 UNIVERSITY OF NAIROBI SITE SUITABILITY ANALYSIS FOR RESIDENTIAL DEVELOPMENTS A case study of Langata Constituency, Nairobi Kenya Presented By Kevin Otiego Supervisor: Mr. Samuel Nthuni Department of Geospatial Engineering and Space Technology April 30 th 2015 otiegokevin@gmail.com

2 TABLE OF CONTENTS Introduction Problem Statement Objectives Methodology Results and Analysis Conclusion and Recommendations

3 INTRODUCTION Identification of potential sites for residential developments is one of the critical issues of planning. Selecting suitable sites for residential development is a complex process which may result to conflicting objectives. These complexities necessitate the simultaneous use of several decision support tools such as GIS and MCE technique using AHP. Selecting suitable sites for residential development is a complex process which may result to conflicting objectives. Spatial Multicriteria Evaluation Techniques can be used to identify suitable sites for residential developments.

4 PROBLEM STATEMENT Identification of suitable sites for residential developments is fundamental for urban development to overcome undesirable urban growth The main problem is to establish locations that can support residential developments depending on a number of factors that have conventionally been identified. This will be solved by considering the affecting factors as criteria and carrying out multi criteria analysis using GIS tools in order to arrive at a result showing suitable sites for residential developments.

5 Main Objective OBJECTIVES To Identify potential sites suitable for residential developments in Langata constituency using spatial multi criteria techniques. Specific Objectives To Develop a Matlab program to compute criterion weights based on the principles of Analytical Hierarchy Process To Produce a suitability map for each evaluation criterion To Carry out spatial multicriteria analysis resulting in the determination of suitable sites for residential developments

6 METHODOLOGY

7 ANALYSIS CRITERIA

8 OVERLAY FORMULAE IMPLEMENTED: WEIGHTING

9 SUITABILITY MODEL

10 AREA OF STUDY Constituency Number Attribute Profile 277 Population 176,314 Area County Member of Parliament Number of County Assembly sq.km Nairobi Joshua Olum 5 Source: KNBS

11 CRITERION MAP FOR LAND SUITABILITY

12 PROXIMITY TO PRIMARY SCHOOLS SUITABILITY MAP

13 PROXIMITY TO SECONDARY SCHOOLS SUITABILITY MAP

14 PROXIMITY TO HEALTH FACILITIES SUITABILITY MAP

15 ASPECT SUITABILITY MAP

16 ROAD PROXIMITY SUITABILITY MAP

17 SECURITY SUITABILITY MAP

18 FINAL SUITABILITY MAP

19 EXTREMELY SUITABLE AREAS

20 LESS SUITABLE AREAS

21 CONCLUSION The framework developed in this study successfully identified areas in Langata Constituency that were suitable for residential development based on the selected criteria. This indicates that Langata Constituency has the ability to fulfill future demands for residential needs.

22 RECOMMENDATIONS Further analysis should be carried out to evaluate the economic costs, benefits and risks associated with developing the identified sites. The Getis-Ord G-Statistic is recommended to help shed more insight and perhaps provide a conclusive reason why 45.8% (27.02km²) of the area considered suitable for analysis, was not found suitable for residential development. Web-based mapping application should be developed showing suitable sites for residential development. This will have greater impact on the public through interactive, web-based maps by improving information dissemination. Another recommendation, which is of personal interest, would be to implement the developed AHP computation program into GIS learning module as an example of spatial problem solving using GIS and in particular the Multi Criteria Decision Making.

23 Thank You