Abstract

Aquatic vegetation has important ecological and regulatory functions and should be monitored in order to detect ecosystem changes. Field data collection is often costly and time-consuming; remote sensing with unmanned aircraft systems (UASs) provides aerial images with sub-decimetre resolution and offers a potential data source for vegetation mapping. In a manual mapping approach, UAS true-colour images with 5-cm-resolution pixels allowed for the identification of non-submerged aquatic vegetation at the species level. However, manual mapping is labour-intensive, and while automated classification methods are available, they have rarely been evaluated for aquatic vegetation, particularly at the scale of individual vegetation stands. We evaluated classification accuracy and time-efficiency for mapping non-submerged aquatic vegetation at three levels of detail at five test sites (100 m 100 m) differing in vegetation complexity. We used object-based image analysis and tested two classification methods (threshold classification and Random Forest) using eCognition®. The automated classification results were compared to results from manual mapping. Using threshold classification, overall accuracy at the five test sites ranged from 93% to 99% for the water-versus-vegetation level and from 62% to 90% for the growth-form level. Using Random Forest classification, overall accuracy ranged from 56% to 94% for the growth-form level and from 52% to 75% for the dominant-taxon level. Overall classification accuracy decreased with increasing vegetation complexity. In test sites with more complex vegetation, automated classification was more time-efficient than manual mapping. This study demonstrated that automated classification of non-submerged aquatic vegetation from true-colour UAS images was feasible, indicating good potential for operative mapping of aquatic vegetation. When choosing the preferred mapping method (manual versus automated) the desired level of thematic detail and the required accuracy for the mapping task needs to be considered.

Keywords

aquatic vegetation; drone; growth form; object-based image analysis (OBIA); random forest; remotely piloted aircraft system (RPAS); species identification; sub-decimetre spatial resolution; unmanned aerial vehicle (UAV); unmanned aircraft system (UAS)

Published in

Remote Sensing
2016, Volume: 8, number: 9, article number: 724

SLU Authors

• Husson, Eva

  • Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
    

• Ecke, Frauke

  • Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
    
  • Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
    

• Reese, Heather

  • Department of Forest Resource Management, Swedish University of Agricultural Sciences
    

Associated SLU-program

Lakes and watercourses


Sustainable Development Goals

Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss
Conserve and sustainably use the oceans, seas and marine resources for sustainable development


UKÄ Subject classification

Environmental Sciences
Remote Sensing


Publication identifier

DOI: https://doi.org/10.3390/rs8090724

Permanent link to this page (URI)

https://res.slu.se/id/publ/77396