Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)

Multispectral data acquisition using UAV in the Jizerka catchment (Jizerské hory Mts.)

 

Lucie Koucká, Jan Jelének, Vojtěch Zástěra

Geoscience Research Reports 53, 2020, pages 59–64
Map sheets: Harrachov (03-23)

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Published online: 13 July 2020

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Abstract

The use of Unmanned Aerial Vehicles (UAVs) in research is currently a new and rapidly developing field that offers a range of options. The method provides recording of high spatial resolution data. The advantage over other methods is its affordability, fast acquisition of data and the possibility of recording at hard-to-reach or unsafe locations. Due to these attributes and the ability of UAVs to carry other accessories (multispectral, thermal sensors, etc.), this method of data collection has also become widely used in remote sensing (Everaerts 2008). Multidimensional models created by photogrammetric techniques and orthomosaic maps generated from the models offer new possibilities to identify and analyze phenomena related to geological exploration and mapping, geotechnical exploration or research using methods of remote sensing.
This study is focused on the variety of work using UAVs. It describes the characteristics of the DJI Phantom 4 quadcopter drone including the installation of a multispectral camera Parrot Sequoia (Figs 1, 2), further the UAVs aerial work methodology including preparations prior to data acquisition (Fig. 3), processing the recorded data in the 3D software Agisoft Metashape (Fig. 6) and subsequent analysis of multispectral data using remote sensing methods - PCA and Decorrelation stretch (Fig. 7). In combination with the analysis of the digital terrain model (Fig. 8), historical and recent sapphire mining was identified on the banks of the Jizerka creek above the confluence with the Sapphire brook (The Jizerské hory Mountains Protected Landscape Area). The data presented in this article were acquired in July 2019. The aim of the continuous research, which has been carried out in cooperation with the North Bohemian Museum in Liberec since 2018, is to identify the extent of historical and current mining areas of sapphires and iserines in order to increase protection of these sites. More about the issue of sapphire mining in the Jizera Meadow is described in Koucká et al. (2018).