Volume XLII-2/W6
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W6, 209-215, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W6-209-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W6, 209-215, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W6-209-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Aug 2017

23 Aug 2017

ASSESSING THE UTILITY OF UAV-BORNE HYPERSPECTRAL IMAGE AND PHOTOGRAMMETRY DERIVED 3D DATA FOR WETLAND SPECIES DISTRIBUTION QUICK MAPPING

Q. S. Li, F. K. K. Wong, and T. Fung Q. S. Li et al.
  • Department of Geography and Resource Management, The Chinese University of Hong Kong, HKSAR

Keywords: DSM, Feature Reduction, Hyperspectral, Photogrammetric Point Cloud, Species Mapping, UAV

Abstract. Lightweight unmanned aerial vehicle (UAV) loaded with novel sensors offers a low cost and minimum risk solution for data acquisition in complex environment. This study assessed the performance of UAV-based hyperspectral image and digital surface model (DSM) derived from photogrammetric point clouds for 13 species classification in wetland area of Hong Kong. Multiple feature reduction methods and different classifiers were compared. The best result was obtained when transformed components from minimum noise fraction (MNF) and DSM were combined in support vector machine (SVM) classifier. Wavelength regions at chlorophyll absorption green peak, red, red edge and Oxygen absorption at near infrared were identified for better species discrimination. In addition, input of DSM data reduces overestimation of low plant species and misclassification due to the shadow effect and inter-species morphological variation. This study establishes a framework for quick survey and update on wetland environment using UAV system. The findings indicate that the utility of UAV-borne hyperspectral and derived tree height information provides a solid foundation for further researches such as biological invasion monitoring and bio-parameters modelling in wetland.