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Open AccessArticle

Combined Use of Optical and Synthetic Aperture Radar Data for REDD+ Applications in Malawi

Joanneum Research, Institute for Information and Communication Technologies, Steyrergasse 17, 8010 Graz, Austria
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Land 2018, 7(4), 116; https://doi.org/10.3390/land7040116
Received: 13 August 2018 / Revised: 18 September 2018 / Accepted: 4 October 2018 / Published: 10 October 2018
(This article belongs to the Special Issue Monitoring Land Cover Change: Towards Sustainability)
Recent developments in satellite data availability allow tropical forest monitoring to expand in two ways: (1) dense time series foster the development of new methods for mapping and monitoring dry tropical forests and (2) the combination of optical data and synthetic aperture radar (SAR) data reduces the problems resulting from frequent cloud cover and yields additional information. This paper covers both issues by analyzing the possibilities of using optical (Sentinel-2) and SAR (Sentinel-1) time series data for forest and land cover mapping for REDD+ (Reducing Emissions from Deforestation and Forest Degradation) applications in Malawi. The challenge is to combine these different data sources in order to make optimal use of their complementary information content. We compare the results of using different input data sets as well as of two methods for data combination. Results show that time-series of optical data lead to better results than mono-temporal optical data (+8% overall accuracy for forest mapping). Combination of optical and SAR data leads to further improvements: +5% in overall accuracy for land cover and +1.5% for forest mapping. With respect to the tested combination methods, the data-based combination performs slightly better (+1% overall accuracy) than the result-based Bayesian combination. View Full-Text
Keywords: dry forest; land cover; REDD+; Sentinel; time series data; optical; SAR; data combination dry forest; land cover; REDD+; Sentinel; time series data; optical; SAR; data combination
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Hirschmugl, M.; Sobe, C.; Deutscher, J.; Schardt, M. Combined Use of Optical and Synthetic Aperture Radar Data for REDD+ Applications in Malawi. Land 2018, 7, 116.

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