Degradation of Urban Green Spaces in Lagos, Nigeria: Evidence from Satellite and Demographic Data
| Autor: | Ronald Okwemba, Onyumbe E. Ben Lukongo, Caroline O. Akinrinwoye, Olipa S. Mwakimi, Tomas Ayala-Silva, Edmund C. Merem, Yaw A. Twumasi, Kamran Abdollahi, Kellyn LaCour-Conant, Joshua Tate, John B. Namwamba |
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| Rok vydání: | 2020 |
| Předmět: |
Ground truth
010504 meteorology & atmospheric sciences Contextual image classification business.industry Environmental resource management Decision tree Census 010502 geochemistry & geophysics 01 natural sciences Geography Thematic Mapper Population projection Sustainability General Earth and Planetary Sciences business Risk assessment 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Advances in Remote Sensing. :33-52 |
| ISSN: | 2169-2688 2169-267X |
| DOI: | 10.4236/ars.2020.91003 |
| Popis: | The study aimed to assess the potential of using Remote Sensing (RS) da-ta to evaluate the changes of urban green spaces in Lagos, Nigeria. Land-sat Thematic Mapper and Landsat 8 (Operational Land Imager) data pair of May 4, 1986, December 12, 2002 and January 1, 2019 covering Lagos Government Authority (LGA) were used for this study. Supervised image classification technique using Maximum Likelihood Classifier (MLC) was used to create base map which was then used for ground truthing. Ran-dom Forest (RF) classification technique using RF classifier was utilized in this study to generate the final land use land cover map. RF is an en-semble learning method for classification that operates by constructing a multitude of decision trees at training time and outputting the class that is the mode of the classes (classification). Lagos census population data was also used in this study to model population projection. Extrapolation of the model was used to predict data for the years, 2020 and 2040. Re-sults of the study revealed a reduction of urban green spaces due to agri-culture and settlement. While the remote mapping revealed the gradual dispersion of ecosystem degradation indicators spread across the state, there exists clusters of areas vulnerable to environmental hazards across Lagos. To mitigate these risks, the paper offered recommendations rang-ing from the need for effective policy to green planning education for city managers, developers and risk assessment. These measures will go a long way in helping sustainability and management of land resources in Lagos. |
| Databáze: | OpenAIRE |
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