Uav-based sorghum growth monitoring: A comparative analysis of lidar and photogrammetry

M. Maimaitijiang, V. Sagan, H. Erkbol, J. Adrian, M. Newcomb, D. Lebauer, D. Pauli, N. Shakoor, T. C. Mockler

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

Canopy height (CH) and leaf area index (LAI) provide key information about crop growth and productivity. A rapid and accurate retrieval of CH and LAI is critical for a variety of agricultural applications. LiDAR and RGB photogrammetry have been increasingly used in plant phenotyping in recent years thanks to the developments in Unmanned Aerial Vehicle (UAV) and sensor technology. The goal of this study is to investigate the potential of UAV LiDAR and RGB photogrammetry in estimating crop CH and LAI. To this end, a high resolution 32 channel LiDAR and RGB cameras mounted on DJI Matrice 600 Pro UAV were employed to collect data at sorghum fields near Maricopa, Arizona, USA. A series of canopy structure metrics were extracted using LiDAR and RGB photogrammetry-based point clouds. Random Forest Regression (RFR) models were established based on the UAV-LiDAR and photogrammetry-derived metrics and field-measured LAI. The results show that both UAV-LiDAR and RGB photogrammetry demonstrated promising accuracies in CH extraction and LAI estimation. Overall, UAV-LiDAR yielded superior performance than RGB photogrammetry in both low and high canopy density sorghum fields. In addition, Pearson's correlation coefficient, as well as RFR-based variable importance analysis demonstrated that height-based metrics from both LiDAR and photogrammetric point clouds were more useful than density-based metrics in LAI estimation. This study proved that UAV-based LiDAR and photogrammetry are important tool in sustainable field management and high-Throughput phenotyping, but LiDAR is more accurate than RGB photogrammetry due to its greater canopy penetration capability.

Original languageEnglish (US)
Pages (from-to)489-496
Number of pages8
JournalISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Volume5
Issue number3
DOIs
StatePublished - Aug 3 2020
Event2020 24th ISPRS Congress on Technical Commission III - Nice, Virtual, France
Duration: Aug 31 2020Sep 2 2020

Keywords

  • canopy height
  • leaf area index (LAI)
  • LiDAR
  • phenotyping
  • photogrammetry
  • Unmanned Aerial Vehicle (UAV)

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Environmental Science (miscellaneous)
  • Instrumentation

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