Spectroscopy and Spectral Analysis, Volume. 41, Issue 8, 2578(2021)
Analysis of Influencing Factors in Wheat/Maize Canopy RVI and NDVI Acquisition Using Ground-Based Remote Sensing System
Figures & Tables(13)
Fig. 1. Observation system and equipment
(a): Observation site; (b): SRS-NDVI sensor;(c): CR300 data collector
Fig. 3. Daily trend of canopy red light and near infrared reflectance
(a): Wheat; (b): Maize
Fig. 4. Distribution of canopy red light and near infrared reflectance under different view azimuth angles
(a): Wheat; (b): Maize
Fig. 5. Distribution of canopy red light and near infrared reflectance under different view zenith angles
(a): Wheat; (b): Maize
Fig. 7. Distribution of canopy RVI and NDVI under different view azimuth angles
(a): Wheat; (b): Maize
Fig. 8. Distribution of canopy RVI and NDVI under different view zenith angles
(a): Wheat; (b): Maize
Table 1. Experimental parameters
View tableView in ArticleTable 1. Experimental parameters
Parameters θ/(°) φ/(°) H/m t f/min v/(m·min-1) θ -60~60 0 1.0 12:00—14:00 60 2 φ 45 0~180 1.0 12:00—14:00 60 2 H 45 0 0.5~2.5 12:00—14:00 60 2 t 45 0 1.0 8:00—18:00 60 2 f 45 0 1.0 12:00—14:00 2~60 2 v 45 0 1.0 12:00—14:00 60 0~4
Table 2. LAI of wheat and maize in each growth stage
View tableView in ArticleTable 2. LAI of wheat and maize in each growth stage
Wheat growth stage Maize growth stage Regreening 1.04 V7 0.85 Jointing 2.08 V9 1.95 Heading 2.82 V11 3.09 Flowering 3.60 V12 3.81 Filling 2.33 V14 4.87
Table 3. Correlation coefficient of canopy spectral information and observation conditions
View tableView in ArticleTable 3. Correlation coefficient of canopy spectral information and observation conditions
Parameters Crop H f v t φ θ RRED Wheat 0.041 0.216 0.091 0.938** 0.941** -0.894** Maize 0.053 0.105 0.033 0.973** 0.964** -0.970** RNIR Wheat 0.083 0.111 0.138 0.905** 0.980** -0.944** Maize 0.057 0.284 0.142 0.902** 0.897** -0.961**
Table 4.
CV of canopy spectral information under different observation conditionsView tableView in ArticleTable 4.
CV of canopy spectral information under different observation conditionsCrop Growth stage LAI RVI NDVI t φ θ t φ θ Regreening 1.04 15% 28% 44% 12% 27% 50% Jointing 2.08 24% 27% 39% 12% 15% 17% Wheat Heading 2.82 37% 34% 27% 12% 11% 7% Flowering 3.60 50% 30% 18% 10% 6% 2% Filling 2.33 31% 26% 43% 15% 12% 14% V7 0.85 10% 11% 11% 32% 34% 39% V9 1.95 19% 15% 19% 36% 25% 31% Maize V11 3.09 18% 16% 17% 23% 21% 21% V12 3.81 26% 31% 27% 22% 26% 23% V14 4.87 33% 32% 29% 22% 20% 18%
Table 5. Influence weight
W of different observation conditions on canopy spectral informationView tableView in ArticleTable 5. Influence weight
W of different observation conditions on canopy spectral informationCrop Growth stage LAI RVI NDVI t φ θ t φ θ Regreening 1.04 0.17 0.51 0.32 0.14 0.56 0.30 Jointing 2.08 0.27 0.43 0.30 0.28 0.39 0.33 Wheat Heading 2.82 0.38 0.28 0.34 0.39 0.25 0.36 Flowering 3.60 0.51 0.18 0.31 0.57 0.12 0.31 Filling 2.33 0.31 0.43 0.26 0.37 0.34 0.29 V7 0.85 0.31 0.35 0.34 0.31 0.37 0.32 V9 1.95 0.36 0.36 0.28 0.39 0.34 0.27 Maize V11 3.09 0.34 0.34 0.32 0.35 0.33 0.32 V12 3.81 0.31 0.32 0.37 0.32 0.32 0.36 V14 4.87 0.35 0.31 0.34 0.36 0.31 0.33
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Yu-dong ZHENG, Yun-cheng XU, Hai-jun YAN, Yong-jun ZHENG. Analysis of Influencing Factors in Wheat/Maize Canopy RVI and NDVI Acquisition Using Ground-Based Remote Sensing System[J]. Spectroscopy and Spectral Analysis, 2021, 41(8): 2578
Paper Information
Category: Research Articles
Received: Jun. 25, 2020
Accepted: --
Published Online: Sep. 8, 2021
The Author Email: ZHENG Yu-dong (15612771262@163.com)
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