Built-up expansion in Kitengela, Kenya, 2005-2025: classified maps, reference points and code

Data and code for: Passiany, M., Kiema, J.B.K. & Mbathi, M. (2026). Urban expansion on peri-urban land in Kitengela, Kenya: a GeoAI and legal assessment, 2005-2025. African Journal on Land Policy and Geospatial Sciences (submitted). Contents: built-up/non-built maps of Kitengela for 2005, 2010, 2015, 2020 and 2025 (30 m GeoTIFF, Random Forest classification of Landsat and Sentinel-2 composites in Google Earth Engine, raw and temporally consistent versions); 500 stratified reference points with labels, confidence ratings and notes (labels drafted with AI assistance and reviewed point by point by the first author in Google Earth Pro); the planning-area boundary and land-use zones digitised from the Kitengela Integrated Strategic Urban Development Plan 2020-2030; all statistics reported in the paper; and the Google Earth Engine and Python scripts. See README.md. The maps overstate built-up land (user's accuracy 21-67%); use the error-adjusted areas in the paper for area estimates. Data licensed CC BY 4.0; code MIT.