Quantifying the spatio-temporal patterns of settlement growth in a metropolitan region of Ghana

This is the final version of the article. It first appeared from Springer via http://dx.doi.org/10.1007/s10708-016-9719-xRetrospective understanding of the magnitude and pace of urban expansion is necessary for effective growth management in metropolitan regions. The objective of this paper is to quantify the spatial– temporal patterns of urban expansion in the Greater Kumasi Sub-Region (GKSR)—a functional region comprising eight administrative districts in Ghana, West Africa. The analysis is based on Landsat remote sensing images from 1986, 2001 and 2014 which were classified using supervised maximum likelihood algorithm in ERDAS IMAGINE. We computed three complementary growth indexes namely; Average Annual Urban Expansion Rate, Urban Expansion Intensity Index (UEII) and Urban Expansion Differentiation Index to estimate the amount and intensity of expansion over the 28-year period. Overall, urban expansion in the GKSR has been occurring at an average annual rate of 5.6 %. Consequently, the sub-region’s built-up land increased by 313 km^2 from 88 km^2 in 1986 to 400 km^2 in 2014. The analysis further show that about 72 % of the total built-up land increase occurred in the last 13 years alone, with UEII value of 0.605 indicating a moderate intensity of urban expansion. Moreover, the metropolitan-core of the sub-region, being the focal point of urban development and the historical origins of expansion, accounted for more than half of the total built-up land increase over the 28-year period. Over the last decade and half however, urban expansion has spilled into the neighbouring peripheral districts, with the highest intensity and fastest rate of expansion occurring in districts located north and north east of the sub-regional core. We recommend a comprehensive regional growth management strategy grounded in effective strategic partnerships among the respective administrative districts to curb unsustainable urban expansion

Defining the Peri-Urban: A Multidimensional Characterization of Spatio-Temporal Land Use along an Urban−Rural Gradient in Dar es Salaam, Tanzania

Highly dynamic peri-urban areas, particularly in the Global South, face many challenges including a lack of infrastructure, ownership conflicts, land degradation, and sustainable food production. This study aims to assess spatial land use characteristics and processes in peri-urban areas using the case of Dar es Salaam, Tanzania. A mixed-method approach was applied, consisting of expert interviews and spatial data analysis, on a local scale along an urban–rural gradient. Expert interviews were conducted during a field study and analyzed regarding the characteristics and processes of peri-urban land development. A GIS-based analysis of land use patterns was applied using satellite imagery and Open Street Map data to identify a number of variables, such as building density and proximity to environmental features. Results show specific patterns of land use indicators, which can be decreasing (e.g., house density), increasing (e.g., tree coverage), static (e.g., house size), or randomly distributed (e.g., distance to river), along a peri-urban gradient. Key findings identify lack of service structures and access to public transport as major challenges for the population of peri-urban areas. The combination of qualitative expert interviews and metrics-based quantitative spatial pattern analysis contributes to improved understanding of the patterns and processes in peri-urban land use changes.Peer Reviewe

Simulating farm income under the current soil management regime in the mid-hills of Nepal

Farmers in the mid-hills of Nepal follow diverse farming systems. The peri-urban area of this region, where population density is higher, faces several problems in farming. While hills suffer from erosion because they are erodible, the peri-urban areas face the problem of decline in factor productivity, particularly in intensively cultivated farmlands. The present study is concerned with simulating farm income on a regional scale based on soil management practices. Spatial explicit simulation shows that the loss of farm income due to degradation is substantially higher in hills while it is lower in valley bottoms. Strategy formulation and testing in the spatial environment indicates that Geographic Information System is an appropriate methodological tool for simulating the consequences of particular interventions

Adapting Land Administration to the Institutional Framework of Customary Tenure:

Historical experience in many Sub-Saharan African countries demonstrates that an alternative approach to conventional land administration methods is required to appropriately secure tenure and administer land rights in customary areas. This book is about dealing with the dynamics of customary tenure and with land governance and institutional capacity issues necessary to implement land administration at the local level. Methods for implementing land administration systems at the local level have been presented in a three-phased tenure model. The author concludes that customary tenure institutions have their own mechanisms for adapting to societal change, and a desirable solution would therefore be to adapt land administration to the institutional framework of customary tenure. The information in this book will be essential for academic work in land administration in developing countries. It will prove a useful reference for policy makers and practitioners in the land administration field

Compliance with Residential Building Standards in the Context of Customary Land Tenure System in Ghana

Zoning regulation is considered as a tool used by government to control developments to ensure sustainability. In Ghana where about 80% of lands are held under customary land tenure systems, implementation of residential standards, which is a government function may conflict with customary norms of holding land. This paper uses case study to examine the implementation of residential policies and enforcement of residential standards in areas under customary land tenure in Ghana and if these policies and standards affect the enjoyment of land rights in the context of customary land tenure. Results showed that non-compliance to residential standards and non-conformity to the local plan has minimal interference on enjoyment of land rights. Residents are ignorant of the details of the residential standards and have never seen a zoning regulations document. There is also low level of monitoring and enforcement. Spatial analysis reveals four main types of non-conformity between orthophoto and local plans i) discrepancies in the orientation of the parcel boundaries, ii) discrepancies in the shapes of plot boundaries, iii) houses constructed on the plot boundary or straddle parcel boundaries, and iii) differences in plot sizes. Results suggest the need for planning authority to use efficient approaches such as GIS and UAV’s to communicate, monitor and enforce the residential standards. It is concluded that collaboration between customary land authorities and the Municipality during the allocation and development of plots may improve spatial conformity between orthophoto and the local plans

Modeling of soil erosion risk in a typical tropical savannah landscape

Tropical savannah landscapes are faced with high soil degradation due to climate change and variability coupled with anthropogenic factors. However, the spatiotemporal dynamics of this is not sufficiently understood particularly, in the tropical savannah contexts. Using the Wa municipality of Ghana as a case, we applied the Revised Universal Soil Loss Equation (RUSLE) model to predict the potential and actual soil erosion risk for 1990 and 2020. Rainfall, soil, topography and land cover data were used as the input parameters. The rate of predicted potential erosion was in the range of 0–111 t ha−1yr−1 and 0–83 t ha−1yr−1 for the years 1990 and 2020, respectively. The prediction for the rate of potential soil erosion risk was generally higher than the actual estimated soil erosion risk which ranges from 0 to 59 t ha−1yr−1 in 1990 and 0 to 58 t ha−1yr−1 in 2020. The open savannah areas accounted for 75.8 % and 73.2 % of the total soil loss in 1990 and 2020, respectively. The validity of the result was tested using in situ data from a 2 km2 each of closed savannah, open savannah and settlement area. By statistical correlation, the predicted soil erosion risk by the model corresponds to the spatial extent of erosion damages measured in the selected area for the validation. Primarily, areas with steep slopes, particularly within settlement, were identified to have the highest erosion risk. These findings underscore the importance of vegetation cover and effective management practices in preventing soil erosion. The results are useful for inferences towards the development and implementation of sustainable soil conservation practice in landscapes with similar attributes

GIS and participatory approaches in natural resources research

Geographical information systems (GIS) have an important role to play in natural resources (NR) research to support rural livelihoods, in particular, and pro-poor development more generally. In this Guide we do not attempt to address the whole range of issues associated with applications of GIS in development, but address specific questions relating to: stakeholder and beneficiary participation in the data collection process; participation in the planning process: assessment of planning and management options, conflicts and development scenarios; integration of social and natural science information using spatial databases in natural resources research and development. A rationale is presented for the integration of GIS and participatory approaches, highlighting the needs for close interdisciplinary collaboration and the application of GIS to development processes through interaction with local stakeholders. The issues involved are illustrated by examples of participatory GIS applications, and by practical case studies in Brazil, Tanzania and Uganda, and Ghana (found at the end of the Guide), and literature-based' examples from South Africa. The basic requirements for making effective use of GIS are discussed along with, in an interdisciplinary, participatory context, the methodological issues involved in data collection, integration of biophysical and socio-economic data, data management, and data feedback and availability to stakeholders. Areas for further research and development are considered and overall recommendations on best practice are made. A glossary of terms used in GIS and participatory approaches in NR research is provided at the end of this Guide along with a list of further reading and a contact list. Guidance is also provided on suitability and cost-effective choice of hardware and software for GIS and participatory approaches

An Assessment of Land Use/Cover Suitable for Peri-urban Green Space Development: an Example of an Integration of GIS with the Multi-Criteria Analysis (MCA) Approach

Land allocation priorities to urban green cover are usually neglected particularly in the countries of developing economies such as Turkey. Lack of urban green space can cause many social and physical problems among the residents. Therefore, urban planning and policy should incorporate suitable green land in the urban planning of cities to optimise the benefits obtained from urban green spaces. Land suitability analysis is a commonly used methodology which provides a framework for developing strategies in the planning of green land development. Two different approaches will be utilised for the assessment of suitability of land uses for urban agriculture, forest and natural vegetation in the Pendik district of Istanbul. Standardisation of values in criteria maps was done using the deterministic approach in the first case whereas fuzzy membership was utilised as an alternative in the second case. Analytical Hierarchical Process (AHP) was used for the weighting of sub-criteria and map layers were overlaid using the weighted linear combination using the GIS software. Geophysical factors, transport and services accessibility, land cover/use, blue and green amenities, soil properties, geology and erosion susceptibility are the main criteria selected for the assessment of urban green land suitability. The provision of suitable land for urban agriculture, forest and natural vegetation uses will provide a framework to the land use planning and decision support aimed at contributing to urban sustainable development

SOCIO-ECONOMIC AND ENVIRONMENTAL ASPECTS OF FARMING PRACTICES IN THE PERI-URBAN HINTERLANDS OF NEPAL

Spatial location of the farm households shapes farming practices and livelihoods of the farmers. Many socio-economic variables have strong spatial relations that would otherwise be missed by data aggregation at household level. Geographic Information System (GIS)provides display and analysis of socio-economic data that may be fundamental for many social scientists to understand socio-economic reality influenced by geographical position of the farm households. Present article aims at integrating socio-economic data into GIS environment to examine spatial relation in the resource availability and use employing spatial and random sampling techniques. Result demonstrates the variation in the socioeconomic attributes along the spatial gradient which is mainly related to the infrastructures such as road, market and improved agro-inputs. While households with better access to these infrastructures have tendency to use more agro-chemicals, have larger family, land holding and livestock units, better off-farm opportunities, commercial farming orientation and hence higher family income; opposite is true for the households with poor access to these infrastructures. Peri-urban farmlands, wherever agro-chemicals are applied imprudently, faces the problems of agro-ecological degradation while rural subsistence farming faces the problem of spatial poverty