Toward Operational Mapping of Woody Canopy Cover in Tropical Savannas Using Google Earth Engine
| Autor: | S. Kumar, J. Anchang, C. Wade Ross, Abdoul Aziz Diouf, L. Prihodko, Niall P. Hanan, Wenjie Ji, Qiuyan Yu, Mamadou A. Sarr, B. M. Lind |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Canopy
lcsh:GE1-350 Biomass (ecology) Earth observation 010504 meteorology & atmospheric sciences Copernicus Sentinel data earth observation 010501 environmental sciences Seasonality medicine.disease 01 natural sciences Random forest machine learning cloud-computing Dry season medicine Environmental science vegetation structure Water content lcsh:Environmental sciences 0105 earth and related environmental sciences General Environmental Science Remote sensing Woody plant |
| Zdroj: | Frontiers in Environmental Science, Vol 8 (2020) |
| DOI: | 10.3389/fenvs.2020.00004/full |
| Popis: | Savanna woody plants can store significant amounts of carbon while also providing numerous other ecological and socio-economic benefits. However, they are significantly under-represented in widely used tree cover datasets, due to mapping challenges presented by their complex landscapes, and the underestimation of woody plants by methods that exclude short stature trees and shrubs. In this study, we describe a Google Earth Engine (GEE) application and present test case results for mapping percent woody canopy cover (%WCC) over a large savanna area. Relevant predictors of %WCC include information derived from radar backscatter (Sentinel-1) and optical reflectance (Sentinel-2), which are used in conjunction with plot level %WCC measurements to train and evaluate random forest models. We can predict %WCC at 40 m pixel resolution for the full extent of Senegal with a root mean square error of ∼8% (based on independent sample evaluation). Further examination of model results provides insights into method stability and potential generalizability. Annual median radar backscatter intensity is determined to be the most important satellite-based predictor of %WCC in savannas, likely due to its relatively strong response to non-leaf structural components of small woody plants which remain mostly constant across the wet and dry season. However, the best performing model combines radar backscatter metrics with optical reflectance indices that serve as proxies for greenness, dry biomass, burn incidence, plant water content, chlorophyll content, and seasonality. The primary use of GEE in the methodology makes it scalable and replicable by end-users with limited infrastructure for processing large remote sensing data. |
| Databáze: | OpenAIRE |
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