Scenarios of Urban Growth in Kenya Using Regionalised Cellular Automata Based on Multi Temporal Landsat Satellite Data

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Scenarios of Urban Growth in Kenya Using Regionalised Cellular Automata Based on Multi Temporal Landsat Satellite Data Scenarios of Urban Growth in Kenya Using Regionalised Cellular Automata based on Multi temporal Landsat Satellite Data Dissertation Zur Erlangung des Doktorgrades (Dr. rer. nat.) der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn Vorgelegt von Kenneth Wagia MUBEA Aus Nairobi, Kenia Bonn, 2014 Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn 1. Referent: Prof. Dr. Gunter Menz 2. Referent: Prof. Dr. Klaus Greve Tag der Promotion: 15 April 2014 Erscheinungsjahr: 2014 Diese Dissertation ist auf dem Hochschulschriftenserver der ULB Bonn http://hss.ulb.uni-bonn.de/diss_online elektronisch publiziert ii TABLE OF CONTENTS ACKNOWLEDGEMENTS ................................................................................................... VI ABSTRACT ...................................................................................................................... VIII ZUSAMMENFASSUNG ....................................................................................................... X ACRONYMS ...................................................................................................................... XII LIST OF FIGURES ............................................................................................................. XIII LIST OF TABLES ............................................................................................................... XV LIST OF PAPERS .............................................................................................................. XVI 1 INTRODUCTION .................................................................................................. 1 1.1 Purpose of the Research .................................................................................... 1 1.2 Statement of the problem ................................................................................. 4 1.3 Research Questions ............................................................................................ 5 1.4 Research objectives ............................................................................................ 5 1.5 Outline of the research ...................................................................................... 6 2 URBAN GROWTH MODELLING AND CELLULAR AUTOMATA ............................. 9 2.1 Introduction........................................................................................................ 9 2.2 Urban modelling ............................................................................................... 10 2.2.1 Models .............................................................................................................. 10 2.2.2 Types of Models ............................................................................................... 11 2.2.3 Challenges ........................................................................................................ 12 2.2.4 Model uncertainty ............................................................................................ 15 2.3 Modelling urban growth .................................................................................. 18 2.3.1 Background ....................................................................................................... 18 2.3.2 Modelling approaches ...................................................................................... 19 2.3.3 Current practices in urban land-use modelling ................................................ 22 2.3.4 Complexity of Urban Growth ........................................................................... 24 2.3.5 Role of GIS and remote sensing in urban growth modelling ........................... 26 2.4 Cellular automata modelling ............................................................................ 28 2.4.1 Introduction...................................................................................................... 28 2.4.2 Elements of Cellular Automata ........................................................................ 30 2.4.3 Cellular automata models ................................................................................ 34 2.4.4 Advantages of CA urban models ...................................................................... 38 2.4.5 Limitations of CA urban models ....................................................................... 38 2.4.6 Developments in CA models ............................................................................ 39 2.4.7 Cellular automata in urban growth modelling ................................................. 41 iii 3 URBAN GROWTH IN AFRICAN CITIES ............................................................... 43 3.1 Introduction...................................................................................................... 43 3.2 Sustainable growth and characteristics of African cities ................................. 45 3.3 Prosperity of cities ............................................................................................ 47 3.4 Factors influencing urban growth .................................................................... 49 3.5 Nairobi .............................................................................................................. 51 3.5.1 Research area ................................................................................................... 51 3.5.2 Background ....................................................................................................... 53 3.5.3 Physical characteristics..................................................................................... 55 3.5.4 Urban growth in Nairobi .................................................................................. 56 3.6 Nakuru .............................................................................................................. 58 3.6.1 Research area ................................................................................................... 58 3.6.2 Background ....................................................................................................... 59 3.6.3 Physical characteristics..................................................................................... 62 3.6.4 Urban growth in Nakuru .................................................................................. 63 4 MONITORING LAND-USE CHANGES ................................................................. 64 4.1 Introduction...................................................................................................... 64 4.2 Utility of multi-sensor satellite data ................................................................ 66 4.3 Land-use change analysis in Nakuru ................................................................ 70 4.3.1 Data .................................................................................................................. 70 4.3.2 Land-use classification ..................................................................................... 71 4.3.3 Results and Discussion ..................................................................................... 75 4.3.4 Factors influencing land-use changes and urban growth ................................ 86 4.3.5 Consequences of Nakuru’s urban growth ........................................................ 89 4.4 Land-use change analysis in Nairobi ................................................................ 90 4.4.1 Data .................................................................................................................. 90 4.4.2 Land-use classification ..................................................................................... 91 4.4.3 Results and discussion ...................................................................................... 92 4.4.4 Factors influencing land-use changes and urban growth ................................ 95 4.4.5 Consequences of Nairobi’s urban growth ........................................................ 98 5 MODELLING URBAN GROWTH ....................................................................... 100 5.1 Introduction.................................................................................................... 100 5.2 The modelling framework (XULU) .................................................................. 103 5.3 Model Parameters and Growth Types ........................................................... 105 5.4 Model calibration ........................................................................................... 109 5.5 Model validation ............................................................................................ 109 5.6 Scenarios of urban growth ............................................................................. 112 iv 5.7 Scenarios of urban growth in Nakuru ............................................................ 114 5.7.1 Data ................................................................................................................ 114 5.7.2 Modelling of urban growth in Nakuru ........................................................... 117 5.8 Scenarios of urban process in Nairobi ........................................................... 130 5.8.1 Data ................................................................................................................ 130 5.8.2 Modelling of urban growth in Nairobi ..........................................................
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