Accra, Ghana

Greater Accra is subject to chronic flooding, the impacts of which are increasing due to climate change and population increase. About 60% of Accra’s population lives within the Odaw basin; where frequent and severe urban flooding is a major issue. The World Bank is working to support resilient, clean, and inclusive development in the Greater Accra Region under its Greater Accra Resilience and Integrated Development (GARID) Project.

Open Cities Accra will support the GARID project through the creation of map data to inform participatory solid waste management, and informal settlement upgrading, in these flood prone areas. The Open Cities Accra Project will focus on the neighborhood of Alogboshie and its environs. The project will also involve the remote mapping of Nima, Akweteman and Alajo. Alogboshie is a community that is plagued by perennial flooding, with peaks during the rainy season during June and July. The effects of flooding on human life here is significant; with regular displacement and loss of property. The community is also prone to disease outbreaks.

Open Cities Accra will create a detailed and accurate map of these areas, as well as build the capacity of stakeholders within government institutions. These stakeholders include the Accra Metropolitan Assembly, the Ghana Statistical Services, the Metropolitan and Municipal District Assemblies, the Ministry of Inner Cities Development and Zongos, and the National Disaster Management Organization. This project will help government stakeholders to make data-driven decisions to improve the lives of local populations. This will include informed planning decisions, and improved disaster response capabilities.

Download Accra data

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