Sustainable urban expansion is key to Africa’s growth

27 August 2021Technology used to map Lusaka, Zambia is replicable in other African cities to upgrade informal settlements and achieve sustainable urban expansion. Sustainable urban expansion is key to Africa’s growth.

International organisations Ordnance Survey (OS), the International Growth Centre (IGC) and the Commonwealth Association of Architects (CAA) have created an automated digital base map of Lusaka, the capital in Zambia. The base map makes it easier for authorities to respond to the challenges associated with urban growth, and the availability of accurate and up-to-date data for creating well-planned and managed cities. Sustainable urban expansion is key to Africa’s growth.

In its efforts to ensure resilient towns and cities, the Zambian Ministry of Local Government expressed the need to better understand Lusaka’s informal settlements.

Using aerial imagery provided by the Zambia Survey Department in the Ministry of Lands and Natural Resources, OS created a new base map covering 420km2 across Lusaka, using Artificial Intelligence (AI).

Joseph Minango, Surveyor General, Zambia Ministry of Lands says that the creation of a detailed map of Lusaka will assist government to deliver better outcomes for informal settlements and other critical uses including land auditing and titling and effective land management.

Digital map has a multitude of uses

According to Andy Wilson, Region Director, Africa OS this technique is rapid, accurate and cost-effective. “The digital map has a multitude of uses, including the design and management of critical infrastructure services, land use planning, transport planning, land tenure, ownership and administration together with the integration of future census data,” says Wilson.

To create the map, computers are taught what to look for in images using training data; the technology then automatically creates mapping quickly and accurately.

“The rapid delivery of a scalable and replicable national digital base map is not only relevant to cities such as Lusaka, but also has far reaching benefits at national and regional scale. OS data will provide the evidence and information to support critical decisions when upgrading existing informal settlements and planning future infrastructure to promote economic prosperity,” says Wilson.

Base map opens a wealth of opportunities

According to Victoria Delbridge, Head of Cities that Work, International Growth Centre Zambia’s policymakers need up-to-date evidence and tools to make critical decisions on urban investments. “The base map created through this collaboration opens up a wealth of opportunities to better target and deliver the infrastructure and services that citizens need to prosper in cities, particularly the most vulnerable residents in informal settlements who are often absent from formal data sources,” says Delbridge.

The world is rapidly urbanising with over 55% of the global population now living in urban areas and by 2050, it is projected to expand by an additional 2.5 billion urban dwellers. Sub-Saharan Africa in particular, is urbanising twice as fast as Europe with urban populations expected to triple by 2050.

The World Bank estimate that 54% of Sub Saharan African urban dwellers are living in informal settlements and between 50% and 80% rely on informal jobs. These dwellings are overcrowded, often polluted, with inadequate housing, and limited access to water and sanitation facilities. Furthermore, these informal sites lack the infrastructure required to support sustainable, liveable, and productive urban environments.

OS mapping data will help identify informal settlements, population and density, the number of built structures, the location of transport infrastructure surrounding the formal and informal neighbourhoods, as well as access to electricity, sanitation facilities and clean water. A sister project, led by Patrick Lamson-Hall of New York University’s Marron Institute, is contributing to this analysis by creating a typology of the various informal settlements and tracking their expansion over time.

Together this will enable the Ministry to better target investment in critical infrastructure and services, upgrading informal settlements to provide for the most vulnerable residents. It will also assist in better planning for urban expansion, which reduces the overall cost of infrastructure investment, limits informality, and enables more resilient and sustainable urban futures.

Solutions to meet the challenge of unplanned settlements

Peter Oborn, Senior Vice President, Commonwealth Association of Architects says that rapid urbanisation and unplanned settlements present an increasingly serious challenge in terms of social, economic and environmental well-being.

“The provision of accurate digital base maps creates a vitally important resource for use by policy makers and planners in the development of evidence-based solutions that will help deliver greater impact and at speed,” says Osborn.

By 2025, roughly 440 cities in emerging economies will contribute to nearly half of global economic growth. Sprawling urban areas limit access to job opportunities and social and commercial services while also being disconnected. If well-managed and planned, urbanisation in rapidly developing cities can be transformative, creating jobs, reducing poverty, and improving residents’ quality of life with better access to healthcare and cleaner water.

With two-thirds of African cities yet to be built, and retro-fitting infrastructure being three times more expensive, sustainable urbanisation is one of the solutions to our ever-growing global population and can increase prosperity, while alleviating high levels of urban poverty. Sustainable urban expansion is key to Africa’s growth.

For more information visit http://www.os.uk/theysee

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