Study of Foliage Abundance and Laser Incident Angles on Rice Plant Height Estimation using a short-range LiDAR measurement

Shota GOYA; Atsushi RIKIMARU; Kazuyoshi TAKAHASHI

doi:10.4287/jsprs.57.217

Method for estimating rice plant height without ground surface detection using laser scanner measurement

Journal of Applied Remote Sensing ◽

10.1117/1.jrs.10.046018 ◽

2016 ◽

Vol 10 (4) ◽

pp. 046018 ◽

Cited By ~ 4

Author(s):

Anh Thu Thi Phan ◽

Kazuyoshi Takahashi ◽

Atsushi Rikimaru ◽

Yasuhiro Higuchi

Keyword(s):

Plant Height ◽

Rice Plant ◽

Laser Scanner ◽

Ground Surface ◽

Surface Detection

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Analysis of Plant Height Changes of Lodged Maize Using UAV-LiDAR Data

Agriculture ◽

10.3390/agriculture10050146 ◽

2020 ◽

Vol 10 (5) ◽

pp. 146 ◽

Cited By ~ 2

Author(s):

Longfei Zhou ◽

Xiaohe Gu ◽

Shu Cheng ◽

Guijun Yang ◽

Meiyan Shu ◽

...

Keyword(s):

Plant Height ◽

Maize Yield ◽

Canopy Height ◽

Estimation Accuracy ◽

Yield Reduction ◽

Lidar Data ◽

Height Estimation ◽

Aerial Vehicle ◽

Yield Quality ◽

Maize Plants

Lodging stress seriously affects the yield, quality, and mechanical harvesting of maize, and is a major natural disaster causing maize yield reduction. The aim of this study was to obtain light detection and ranging (LiDAR) data of lodged maize using an unmanned aerial vehicle (UAV) equipped with a RIEGL VUX-1UAV sensor to analyze changes in the vertical structure of maize plants with different degrees of lodging, and thus to use plant height to quantitatively study maize lodging. Based on the UAV-LiDAR data, the height of the maize canopy was retrieved using a canopy height model to determine the height of the lodged maize canopy at different times. The profiles were analyzed to assess changes in maize plant height with different degrees of lodging. The differences in plant height growth of maize with different degrees of lodging were evaluated to determine the plant height recovery ability of maize with different degrees of lodging. Furthermore, the correlation between plant heights measured on the ground and LiDAR-estimated plant heights was used to verify the accuracy of plant height estimation. The results show that UAV-LiDAR data can be used to achieve maize canopy height estimation, with plant height estimation accuracy parameters of R2 = 0.964, RMSE = 0.127, and nRMSE = 7.449%. Thus, it can reflect changes of plant height of lodging maize and the recovery ability of plant height of different lodging types. Plant height can be used to quantitatively evaluate the lodging degree of maize. Studies have shown that the use of UAV-LiDAR data can effectively estimate plant heights and confirm the feasibility of LiDAR data in crop lodging monitoring.

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Dissection of genetic architecture of rice plant height and heading date by multiple-strategy-based association studies

Scientific Reports ◽

10.1038/srep29718 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 14

Author(s):

Liyuan Zhou ◽

Shouye Liu ◽

Weixun Wu ◽

Daibo Chen ◽

Xiaodeng Zhan ◽

...

Keyword(s):

Plant Height ◽

Rice Plant ◽

Genetic Architecture ◽

Association Studies ◽

Heading Date ◽

Multiple Strategy

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Demonstration and uncertainty analysis of synchronised scanning lidar measurements of 2-D velocity fields in a boundary-layer wind tunnel

Wind Energy Science ◽

10.5194/wes-2-329-2017 ◽

2017 ◽

Vol 2 (1) ◽

pp. 329-341 ◽

Cited By ~ 7

Author(s):

Marijn Floris van Dooren ◽

Filippo Campagnolo ◽

Mikael Sjöholm ◽

Nikolas Angelou ◽

Torben Mikkelsen ◽

...

Keyword(s):

Wind Tunnel ◽

Uncertainty Analysis ◽

Wind Turbine ◽

Short Range ◽

Goodness Of Fit ◽

Wind Tunnels ◽

Small Scale ◽

Measurement Technology ◽

Lidar Measurement ◽

Hot Wire

Abstract. This paper combines the research methodologies of scaled wind turbine model experiments in wind tunnels with short-range WindScanner lidar measurement technology. The wind tunnel at the Politecnico di Milano was equipped with three wind turbine models and two short-range WindScanner lidars to demonstrate the benefits of synchronised scanning lidars in such experimental surroundings for the first time. The dual-lidar system can provide fully synchronised trajectory scans with sampling timescales ranging from seconds to minutes. First, staring mode measurements were compared to hot-wire probe measurements commonly used in wind tunnels. This yielded goodness of fit coefficients of 0.969 and 0.902 for the 1 Hz averaged u and v components of the wind speed, respectively, validating the 2-D measurement capability of the lidar scanners. Subsequently, the measurement of wake profiles on a line as well as wake area scans were executed to illustrate the applicability of lidar scanning to the measurement of small-scale wind flow effects. An extensive uncertainty analysis was executed to assess the accuracy of the method. The downsides of lidar with respect to the hot-wire probes are the larger measurement probe volume, which compromises the ability to measure turbulence, and the possible loss of a small part of the measurements due to hard target beam reflection. In contrast, the benefits are the high flexibility in conducting both point measurements and area scanning and the fact that remote sensing techniques do not disturb the flow during measuring. The research campaign revealed a high potential for using short-range synchronised scanning lidars to measure the flow around wind turbines in a wind tunnel and increased the knowledge about the corresponding uncertainties.

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Rice Plant Height Monitoring from Space with Bistatic Interferometry

Advances in International Rice Research ◽

10.5772/65868 ◽

2017 ◽

Author(s):

Cristian Rossi

Keyword(s):

Plant Height ◽

Rice Plant

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Studies on mosquitoes (Diptera: Culicidae) and anthropicenvironment: 5- Breeding of Anopheles albitarsis in flooded rice fields in South-Eastern Brazil

Revista de Saúde Pública ◽

10.1590/s0034-89101994000500003 ◽

1994 ◽

Vol 28 (5) ◽

pp. 329-331 ◽

Cited By ~ 6

Author(s):

Oswaldo Paulo Forattini ◽

Iná Kakitani ◽

Eduardo Massad ◽

Daniel Marucci

Keyword(s):

Plant Height ◽

Rice Plant ◽

Early Stage ◽

Inverse Correlation ◽

Rice Fields ◽

Control Measures ◽

Paddy Fields ◽

Flooded Rice ◽

South Eastern ◽

Eastern Brazil

Studies on breeding Anopheles albitarsis and association with rice growth in irrigated paddy fields were carried out during the rice cultivation cycle from December 1993 to March 1994. This period corresponded to the length of time of permanent paddy flooding. Breeding occurred in the early stage up until five weeks after transplantation when rice plant height was small. That inverse correlation may give potential direction to control measures.

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Response of BAR-Transformed Rice (Oryza sativa) and Red Rice (Oryza sativa) to Glufosinate Application Timing

Weed Technology ◽

10.1017/s0890037x00042998 ◽

1997 ◽

Vol 11 (2) ◽

pp. 303-307 ◽

Cited By ~ 12

Author(s):

Sujatha Sankula ◽

Michael P. Braverman ◽

Steven D. Linscombe

Keyword(s):

Oryza Sativa ◽

Grain Yield ◽

Plant Height ◽

Rice Plant ◽

Yield Reduction ◽

Bar Gene ◽

Red Rice ◽

Visible Injury ◽

Application Timing ◽

Boot Stage

Glufosinate at 2.2 kg ai/ha injured rice transformed with the BAR gene more when applied to one- to two-leaf (23 to 26%) than to three- to four-leaf (13 to 19%) plants. Visible injury was least when applications were made at boot stage (3 to 14%). However, applications at boot stage caused an average grain yield reduction of 16%. Most treatments did not influence rice plant height. Among single applications (0.3, 0.4, 0.6, 0.8, and 1.1 kg/ha), 1.1 kg/ha glufosinate at three- to four-leaf stage of red rice resulted in greater control (91%) than at panicle initiation (74%) or at boot stage (77%). Injury to red rice was two to 11 times greater than the injury to BAR-transformed rice depending on glufosinate rate and application timing.

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Estimation of Rice Plant Height from a Low-Cost UAV- Based Lidar Point Clouds

International Journal of Geoinformatics ◽

10.52939/ijg.v17i2.1765 ◽

2021 ◽

pp. 89-98

Author(s):

A.T.T. Phan ◽

K. Takahashi

Keyword(s):

Plant Height ◽

Rice Plant ◽

Field Experiments ◽

Low Cost ◽

Laser Scanner ◽

Ground Surface ◽

Point Clouds ◽

Small Root ◽

Small Uav ◽

The Difference

UAV systems are considered effective tools to collect information regarding crops. In this study, the rice growth was observed by a small UAV-based LiDAR system from above. For developing the system, DJI S800 was chosen as a platform on which a non- survey-grade laser scanner HOKUYO UTM30LX-EW was mounted. Field experiments were carried out from late June to late early August 2017 in Nagaoka city, Niigata Prefecture, Japan. Percentile analysis is applied to locate the top and bottom positions of rice plants in three targeted areas. LIDAR-derived plant height is computed by taking the difference between the bottom and the rice plant's top. As a result, the LiDAR-derived canopy height well correlates to rice plant height (R2≥0.86; RMSE <6.0 cm). The small root means square error (RMSE =4.9 cm) is achieved with area 3. In the general case, the RMSE is 5.5 cm (R2=0.88). These results illustrate the capability of estimate plant height before the heading stage from UAV- based LiDAR point clouds without ground surface detection.

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Demonstration and uncertainty analysis of synchronised scanning lidar measurements of 2D velocity fields in a boundary-layer wind tunnel

10.5194/wes-2016-59 ◽

2017 ◽

Cited By ~ 1

Author(s):

Marijn F. van Dooren ◽

Filippo Campagnolo ◽

Mikael Sjöholm ◽

Nikolas Angelou ◽

Torben Mikkelsen ◽

...

Keyword(s):

Remote Sensing ◽

Wind Tunnel ◽

Uncertainty Analysis ◽

Wind Turbine ◽

Short Range ◽

Goodness Of Fit ◽

Wind Tunnels ◽

Small Scale ◽

Lidar Measurement ◽

Hot Wire

Abstract. This paper combines the currently relevant research methodologies of scaled wind turbine model experiments in wind tunnels with remote-sensing short-range WindScanner lidar measurement technology. The wind tunnel of the Politecnico di Milano was equipped with three wind turbine models and two short-range WindScanner lidars to demonstrate the benefits of synchronised scanning lidars in such experimental surroundings for the first time. The dual-lidar system can provide fully synchronised trajectory scans with sampling time scales ranging from seconds to minutes. First, staring mode measurements were compared to hot-wire probe measurements commonly used in wind tunnels. This yielded goodness of fit coefficients of 0.969 and 0.902 for the 1 Hz averaged u- and v-components of the wind speed, respectively, validating the 2D measurement capability of the lidar scanners. Subsequently, the measurement of wake profiles on a line as well as wake area scans were executed to illustrate the applicability of lidar scanning to measuring small scale wind flow effects. An extensive uncertainty analysis was executed to assess the accuracy of the method. The downsides of lidar with respect to the hot-wire probes are the larger measurement probe volume and the loss of some measurements due to moving blades. In contrast, the benefits are the high flexibility in conducting both point measurements and area scanning, and the fact that remote sensing techniques do not disturb the flow while measuring. The research campaign revealed a high potential for using short-range synchronised scanning lidars to accurately measure small scale flow structures in a wind tunnel, and increased the knowledge about the corresponding uncertainties.

Download Full-text