Niamey, Niger

For thousands of years, the Niger River has been the lifeblood for not only Niger, but also its neighboring countries in the Niger River Basin. Yet, even as many Nigeriens depend on the mighty waterway for food, water, and livelihoods, the Niger River also poses a severe flood risk to the West African country during the rainy season. In the third quarter of 2017, widespread flooding due to heavy rains claimed the lives of over 50 people and displaced nearly 200,000. Lying on the banks of the Niger River, the Nigerien capital Niamey is especially vulnerable to flood risk. Poorly planned development in the city, which has contributed to land degradation and soil erosion, has only exacerbated the risk. To make matters even worse, many parts of Niamey, which has seen its population balloon to over one million people, lack proper drainage infrastructure. Against this backdrop, the government of Niger, in partnership with the World Bank and the Global Facility for Disaster Reduction and Recovery (GFDRR), has been stepping up its efforts to systematically gather data and information on Niamey’s exposure and vulnerability to flood risk. The hope here is that this will pave the way for the government of Niger to better plan and prioritize investments in the capital’s flood preparedness.

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.