Ngaoundéré, Cameroon

The city of Ngaoundéré is facing recurring challenges related to urban floods, which are increasing as its uncontrolled urbanization continues. Urbanization has been largely spontaneous, resulting from the increasing occupation of many flood or wetlands and mountain slopes without adequate land management. To improve the management of its territory, the Urban Community of Ngaoundéré (UCN), in collaboration with the Inclusive and Resilient Cities Development Project (IRCDP) financed by the World Bank via the Ministry of Housing and Urban Development (MINHUD), must update their open access spatial data to capture built space and critical infrastructure located in areas at risk of floods on the major beds of the main rivers. These areas are; the Bini Stream and its tributaries whose floods often affect parts of Malang, Dang and Bini neighborhoods; the Mabanga stream and its tributaries crossing Djalingo, Gadamabaga, Joli Soir, Baladji 1, Baladji 2, Bibakala, Madagascar, Gare voyageurs, Gare marchandises, Bidjoro, Manwi and Calme neighborhoods; the Soumsoum watercourse and its tributaries affecting Sabongari 3 and Sabongari Norvegien neighborhoods; and the Mardock Watercourse and its tributaries affecting a good part of the neighborhood of the same name, and the airport neighborhoods. Landslide risk often accompanies flooding, specifically on the slopes of the Ngaoundéré, Ngaouday, Ngaousay rivers which may affect neighborhoods such as Onaref, Socaret and Burkina.
The data generated through Open Cities Ngaoundéré will enable municipal and local authorities to better plan urban growth, land use, urban development and the various interventions in the city in the event of floods and landslides. The city dwellers of Ngaoundéré will then live in a protected and better environment. In the long term, Ngaoundéré will be able to serve as an example of success, for its neighboring localities, in urban planning and computer-aided management of natural resources.

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Mapping Progress to Date

This section provides an overview of mapping activities in the selected city geographic extent. The Before/After widget below allows comparing current density and distribution of map features with snapshots from previous years. The time chart of OSM editing activity over time offers insights on how many features have been contributed to the map over a specified period.

Data Quality

While OSM coverage keeps increasing, it's important to also understand quality of the data created. The tools available in this section allow for comparing OSM data with other "reference" datasets. These could be, for example, official datasets from government agencies showing distribution of features with those available OSM. The "Gap Detection" widget provides a visual representation of potential gaps in data, by comparing the latest OSM buildings with built-up areas automatically detected from satellite imagery.

OSM Community Dynamics

Understanding mapping progress and data quality also requires looking at the local OSM community and how mappers have contributed over time. Embedded widgets in this sections allow e.g. exploring the list of top mappers who contributed to features within the city extent, with links to their OSM user profile page. A time chart of number of user contributions over pre-defined time periods (daily, weekly, monthly), also provides a picture of how consistent the mapping activity in the area is.

Date Range

users made contributions