Evaluating urban land-use demarcation and implementation for various urban functions using GIS and survey-based data: The case of Abuja City, Nigeria oleh Evidence Enoguanbhor, Gladys Chukwurah, Eveline Enoguanbhor, Chioma John-Nsa, Matthew Isimah, Iwebuke Edo, Robert Achenui B, Saheed Matemilola, Chefor Fotang, Uche Ijioma, Esther Ibrahim Humboldt