Bing Maps is releasing open building footprints Nigeria and Kenya. We have detected 50.5 million buildings from Maxar imagery collected between 2020 and 2021. The data is freely available for download and use under applicable license.
This data is licensed by Microsoft under the Open Data Commons Open Database License (ODbL).
50,516,194 building footprint polygon geometries located in Kenya and Nigeria in line-delimited GeoJSON format. You may download the data in GeoJSON format here:
| Location | Building Count | Link | Size (Compressed) |
|---|---|---|---|
| Nigeria | 35,767,509 | Nigeria.geojsonl.zip | 2.3GB |
| Kenya | 14,748,685 | Kenya.geojsonl.zip | 984MB |
GeoJSON is a format for encoding a variety of geographic data structures. For intensive documentation and tutorials, refer to GeoJson blog.
Microsoft has a continued interest in supporting a thriving OpenStreetMap ecosystem.
Maybe. Never overwrite the hard work of other contributors or blindly import data into OSM without first checking the local quality. While our metrics show that this data meets or exceeds the quality of hand-drawn building footprints, the data does vary in quality from place to place, between rural and urban, mountains and plains, and so on. Inspect quality locally and discuss an import plan with the community. Always follow the OSM import community guidelines.
Yes. Currently Microsoft Open Buildings dataset is used in ml-enabler for task creation. You can try it out at AI assisted Tasking Manager. The data will also be made available in Facebook RapiD.
The building extraction is done in two stages:
- Semantic Segmentation – Recognizing building pixels on an aerial image using deep neural networks (DNNs)
- Polygonization – Converting building pixel detections into polygons
There were no changes in the model training process over previous releases.
The evaluation metrics are computed on the set of 2,500 building labels for Nigeria and 2,000 for Kenya.
Building match metrics on the evaluation set:
| Country | Precision | Recall |
|---|---|---|
| Kenya | 97.5% | 69.1% |
| Nigeria | 95.3% | 69.% |
We track following metrics to measure the quality of matched buildings in the evaluation set:
- Intersection over Union – This is a standard metric measuring the overlap quality against the labels
- Dominant angle rotation error – This measures the polygon rotation deviation
| Country | IoU | Rotation error [deg] |
|---|---|---|
| Kenya | 65.9% | 3.9 |
| Nigeria | 64.8% | 1.9 |
We estimate 1.3-1.9% false positive ratio in 1,000 randomly sampled buildings from the entire output corpus.
Vintage of extracted building footprints depends on vintage of the underlying imagery. Underlying imagery is from Maxar between 2020 and 2021.
Our metrics show that in the vast majority of cases the quality is at least as good as hand digitized buildings in OpenStreetMap. It is not perfect, particularly in dense urban areas but it provides good recall in rural areas.
EPSG: 4326
Maybe. This is a work in progress. Also, check out our other building releases!
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