Abstract
The Kenyan coast is constantly under persistent cloud cover which hinders mapping using optical images. Up-to-date land-cover information in such areas is sometimes missing from national mapping initiatives. This study uses a computed composite image based on a mean of cloud and shadow free Function of Mask masked multi-temporal Landsat 8 images acquired during long-dry season in a pilot area. We test the effectiveness of the composite to map mangrove forest using random forest (RF) and support vector machines (SVM) machine learning algorithms integrated with context from Markov random fields (MRF(s)). MRFs was chosen because it is computationally efficient hence can be scaled out nationally. The MRF frameworks are compared to pixel-based classification using threefold independent validation samples. SVM–MRFs and RF–MRFs methods have the highest overall accuracy compared to pixel-based classification. However, visual assessment of predicted land-cover using aerial photograghs established that SVM–MRFs framework corresponded well to land-cover in the study area. This framework also managed to map classes with limited ground reference data better than RF–MRFs. Generally, context in both techniques played a discriminative role especially in heterogeneous regions. Therefore, scaling out this approaches would go a long way in generating mangrove forest map inventory in persistent cloud cover regions which is useful for land-based emission estimation.
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Acknowledgements
We wish to thank SLEEK under the Department of Resource Surveys and Remote Sensing (DRSRS) for aerial imagery and Forest2020 under Kenya Forest Service (KFS) for ground reference data. This research was funded by the Australian government through the SLEEK programme facilitated by the Clinton Change Initiative(CCI).
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Kenduiywo, B.K., Mutua, F.N., Ngigi, T.G. et al. Mapping mangrove forest using Landsat 8 to support estimation of land-based emissions in Kenya. Model. Earth Syst. Environ. 6, 1619–1632 (2020). https://doi.org/10.1007/s40808-020-00778-x
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DOI: https://doi.org/10.1007/s40808-020-00778-x