Funding for this research was provided by:
Japan Society for the Promotion of Science (JP15K13568)
Received: 24 January 2017
Accepted: 8 June 2017
First Online: 17 July 2017
Change Date: 5 September 2018
Change Type: Correction
Change Details: An error in computing the spectral level from time series data from UAV-borne sensors was discovered after this article (Kantha et al. 2017) was published.