Journal Article

Assessment of Multi-Sensor Approach to Savanna Landscape Mapping in Ghana

Kenneth Aidoo, INRA's research fellow, writes on Land use Land Cover maps(LULC)and their important role in continuous mapping and land management.

Publication Date
29 Sep 2025
Authors
Kenneth Aidoo Prof. Fatima Denton Ferdinand Tornyie Ursula Gressner Alex Barimah Owusu
Journal
Taylor & Francis Online
Article Number
2555444
Read Kenneth's Article here:

Land Use Land Cover (LULC) maps play an important role in land cover change assessment. In this study existing LULC maps of 2006 and 2015 were used to develop a standardized LULC classification procedure for continuous mapping and land management. The same procedure was used to produce 2023 LULC map for the study area. Landsat 8, Sentinel-1, and Sentinel-2 were used in combination with a Random Forest algorithm to assess the potential of multi-sensor Earth observations in mapping savanna ecological zones in the Google Earth Engine (GEE). The classification results yielded an overall accuracy of 73.32% and kappa coefficient of 0.6342 when integrating Landsat 8 and Sentinel-2 data. In addition, an overall accuracy of 80.21% and kappa coefficient of 0.7225 were obtained for the combined Landsat 8, Sentinel-2, and Sentinel-1 data. The results demonstrated that using Sentinel-1 data in addition to multispectral data improved the classification accuracy by almost 7%.

Land is an essential natural resource. However, with anthropogenic activities on the savanna landscape being scattered resulting in landscape degradation. It has become imperative to monitor these variable disturbances for a complete understanding of their impact on the savanna landscape. With increasing demands to keep abreast with changing Land Use Land Cover (LULC) in savanna landscapes, therefore, there is the need to model an approach to accurately take inventory of savanna landscapes as a whole for easy and quick understanding of changing trends in vegetation cover.

Our researcher, Kenneth Aidoo’s article on “Assessment of multi-sensor approach to savanna landscape mapping in Ghana” focuses on combining optical and radar data in land cover mapping, using Random Forest and Support Vector Machine in Google Earth Engine (GEE) and examined the accuracies of LULC maps, produced by combined optical sensors alone and both optical and radar sensors.

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