연초의 엽위 분포형태에 따른 지상 원격센서의 유효 탐사거리와 측정 효율성 평가 (Evaluation of Effective Sensing Distance and Measurement Efficiency for Ground-Based Remote Sensors with Different Leaf Distribution in Tobacco Plant)

서지정보

· 발행기관 : 한국토양비료학회
· 수록지 정보 : 한국토양비료학회지(Korean Journal of Soil Science and Fertilizer) / 41권 / 2호 / 126 ~ 136페이지
· 저자명 : 홍순달, 정현철

초록

Tobacco plants grown in pots by sand culture for 70 days after transplanting were used to evaluate the
sensing distance and measurement efficiency of ground-based remote sensors. The leaf distribution of
tobacco plant and sensing distance from the sensors to the target leaves were controlled by two removal
methods of leaves, top-down and bottom-up removal. In the case of top-down removal, the canopy
reflectance was measured by the sensor located at a fixed position having an optimum distance from the
detector to the uppermost leaf of tobacco every time that the higher leaves were one at a time. The
measurement of bottom-up removal, a the other hand, was conducted in the same manner as that of the
top-down removal except that the lower leaves were removed one by one. Canopy reflectance
measurements were made with hand held spectral sensors including the active sensors such as
GreenSeekerTM red and green, Crop Circle ACS-210TM red and amber, the passive sensors of Crop
CircleTM, and spectroradiometer SD2000TM. The reflectance indices by all sensors were generally affected
by the upper canopy condition rather than lower canopy condition of tobacco regardless of sensor type,
passive or active. The reflectance measurement by GreenSeekerTM was affected sensitively at measurement
distance longer than 120 cm, the upper limit of effective sensing distance, beyond which measurement
errors are appreciable. In case of the passive sensors that has no upper limit of effective distance and Crop
CircleTM(ACS210) that has the upper limit of effective sensing distance specified with 213 cm, longer than
that of estimated distance, the measurement efficiency affected by the sensing distance showed no
difference. This result suggests that it is necessary to use the sensor specified optimum distance. The result
revealed that active sensors are more superior than their passive counterparts in establishing between the
relative ratio of reflectance index and the dry weight of tobacco treated by top-down removal, and in the
evaluation of biomass. The Crop Circle ACS-210TM red was proved to have the highest efficiency of
measurement, followed by Crop Circle ACS-210TM amber and GreenSeekerTM red, Crop CircleTM passive,
GreenSeekerTM green, and spectroradiometer, in descending order.

영어초록

Tobacco plants grown in pots by sand culture for 70 days after transplanting were used to evaluate the
sensing distance and measurement efficiency of ground-based remote sensors. The leaf distribution of
tobacco plant and sensing distance from the sensors to the target leaves were controlled by two removal
methods of leaves, top-down and bottom-up removal. In the case of top-down removal, the canopy
reflectance was measured by the sensor located at a fixed position having an optimum distance from the
detector to the uppermost leaf of tobacco every time that the higher leaves were one at a time. The
measurement of bottom-up removal, a the other hand, was conducted in the same manner as that of the
top-down removal except that the lower leaves were removed one by one. Canopy reflectance
measurements were made with hand held spectral sensors including the active sensors such as
GreenSeekerTM red and green, Crop Circle ACS-210TM red and amber, the passive sensors of Crop
CircleTM, and spectroradiometer SD2000TM. The reflectance indices by all sensors were generally affected
by the upper canopy condition rather than lower canopy condition of tobacco regardless of sensor type,
passive or active. The reflectance measurement by GreenSeekerTM was affected sensitively at measurement
distance longer than 120 cm, the upper limit of effective sensing distance, beyond which measurement
errors are appreciable. In case of the passive sensors that has no upper limit of effective distance and Crop
CircleTM(ACS210) that has the upper limit of effective sensing distance specified with 213 cm, longer than
that of estimated distance, the measurement efficiency affected by the sensing distance showed no
difference. This result suggests that it is necessary to use the sensor specified optimum distance. The result
revealed that active sensors are more superior than their passive counterparts in establishing between the
relative ratio of reflectance index and the dry weight of tobacco treated by top-down removal, and in the
evaluation of biomass. The Crop Circle ACS-210TM red was proved to have the highest efficiency of
measurement, followed by Crop Circle ACS-210TM amber and GreenSeekerTM red, Crop CircleTM passive,
GreenSeekerTM green, and spectroradiometer, in descending order.

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