Sources and methods
Every base layer in Kubinu Reach, where it comes from, its licence and its date, then how reach is worked out and what it cannot tell you.
Layers
| Layer | Source | Licence | Date of the data | Rows | Loaded |
|---|---|---|---|---|---|
| Cells | WorldPop modelled gridded population estimates for Nigeria 2025, version 3.0Nnanatu C.C., Gadiaga A., Abbott T.J., Chamberlain H., Lazar A.N., Tatem A.J. (2025). Modelled gridded population estimates for Nigeria 2025 version 3.0. WorldPop, University of Southampton. https://dx.doi.org/10.5258/SOTON/WP00782 | CC BY 4.0 | 2025 | 433,238 | 13 Oct 2026 |
| Travel graph | OpenStreetMap, Geofabrik Nigeria extractOpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. | ODbL 1.0 | 2026-10-11 | 529,736 | 13 Oct 2026 |
| LGAs | OCHA COD-AB Nigeria administrative boundariesOCHA Nigeria, Common Operational Dataset: Subnational Administrative Boundaries (states and LGAs), source OSGoF and eHealth Africa. Humanitarian Data Exchange. | CC BY-IGO | 2019 | 84 | 13 Oct 2026 |
| Markets | GRID3 NGA - MarketsGRID3 Nigeria. GRID3 NGA - Markets: Nigeria country-wide market locations and names. Released September 2020. | GRID3 terms of use (attribution) | 2020-09 | 1,060 | 13 Oct 2026 |
| Places | OpenStreetMap, Geofabrik Nigeria extractOpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. | ODbL 1.0 | 2026-10-11 | 3,048 | 13 Oct 2026 |
| Public points | OpenStreetMap, Geofabrik Nigeria extractOpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. | ODbL 1.0 | 2026-10-11 | 2,704 | 13 Oct 2026 |
| Regions | OCHA COD-AB Nigeria administrative boundariesOCHA Nigeria, Common Operational Dataset: Subnational Administrative Boundaries (states and LGAs), source OSGoF and eHealth Africa. Humanitarian Data Exchange. | CC BY-IGO | 2019 | 3 | 13 Oct 2026 |
| Roads | OpenStreetMap, Geofabrik Nigeria extractOpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. | ODbL 1.0 | 2026-10-11 | 294,614 | 13 Oct 2026 |
| Water | OpenStreetMap, Geofabrik Nigeria extractOpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. | ODbL 1.0 | 2026-10-11 | 595 | 13 Oct 2026 |
How reach is worked out
The ground is cut into hexagonal cells of about 0.1 km², with centres about 350 m apart. Each cell holds the people WorldPop places in it.
An outlet is active in a month when its status is active and it was billed in that month. A workspace can widen that to the last few months. Until a first sales file is uploaded, every outlet with status active counts.
A cell is in reach when an active outlet lies within the reach distance of the cell's centre, measured in a straight line. The distance is 500 m unless the workspace sets another.
Cells that hold people and are not in reach are joined to their neighbours into white-space zones. A zone is listed when it holds at least 2,000 people, or the number the workspace sets. A stretch of white space larger than 40 km² is cut into zones a team can visit, each listed when it holds that many people.
A distributor's territory is the list of LGAs you give us. Its service index is its share of your sales divided by its territory's share of the population.
Checks run on the loaded data
| Check | Result | Figures |
|---|---|---|
| Population | Passed | Tolerance pct 0.5 |
| Population: By state: Kano | Passed | Diff pct -0.003Cells pop 18,785,572Raster pop 18,786,097Cells adults 10,233,694Raster adults 10,233,941Diff adults pct -0.002 |
| Population: By state: Lagos | Passed | Diff pct -0.03Cells pop 12,657,788Raster pop 12,661,604Cells adults 8,272,094Raster adults 8,274,722Diff adults pct -0.032 |
| Population: By state: Ogun | Passed | Diff pct 0.037Cells pop 12,839,056Raster pop 12,834,297Cells adults 7,843,358Raster adults 7,840,182Diff adults pct 0.041 |
| Water | Passed | – |
| Water: Bodies: Lagos Lagoon | Passed | Cells inside 4,188Osm polygons 1Mostly water pct 97.4Flagged water pct 95 |
Licences and exports
Maps, screens and PDF reports may show any of these layers together, with the attribution below.
No file you export from Kubinu Reach holds a column derived from OpenStreetMap. Reach is a straight-line distance, and population and boundaries carry no share-alike duty, so they sit beside your own columns in one file, with WorldPop credited in it.
Attribution
- Nnanatu C.C., Gadiaga A., Abbott T.J., Chamberlain H., Lazar A.N., Tatem A.J. (2025). Modelled gridded population estimates for Nigeria 2025 version 3.0. WorldPop, University of Southampton. https://dx.doi.org/10.5258/SOTON/WP00782 CC BY 4.0.
- OpenStreetMap contributors. Nigeria extract by Geofabrik GmbH. ODbL 1.0.
- OCHA Nigeria, Common Operational Dataset: Subnational Administrative Boundaries (states and LGAs), source OSGoF and eHealth Africa. Humanitarian Data Exchange. CC BY-IGO.
- GRID3 Nigeria. GRID3 NGA - Markets: Nigeria country-wide market locations and names. Released September 2020. GRID3 terms of use (attribution).