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Tian, Qingjiu
- Comparison of Spectral Characteristics between EO-1 ALI and IRS-P6 LISS-III Imagery
Abstract Views :226 |
PDF Views:98
Authors
Affiliations
1 School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, CN
2 International Institute for Earth System Science, Nanjing University, Nanjing 210093, CN
1 School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, CN
2 International Institute for Earth System Science, Nanjing University, Nanjing 210093, CN
Source
Current Science, Vol 108, No 5 (2015), Pagination: 954-960Abstract
Data from the Indian Remote Sensing Satellite (IRS) P6 have been widely used for integrated land and water resources management. To complement and substitute data measured from other similar satellites and obtain constant measurements of the Earth's surface features, we evaluated the spectral characteristics between IRS-P6 LISS-III, a sensor of IRS P6, and EO- 1 ALI by comparing their top-of-atmosphere (TOA) reflectance and normalized difference vegetation index (NDVI) of three nearly simultaneous image pairs. In particular, due to the difference in NIR band design between LISS-III and ALI, the spectral characteristics of NIR band of LISS-III were compared with the two NIR bands of ALI. The results demonstrate that a distinct linear correlation exists between the spectral characteristics of LISS-III and ALI, with R2 values ranging from 0.976 to 0.995 for TOA reflectance and from 0.992 to 0.997 for NDVI. Therefore, a mutual complementation and substitution of the TOA reflectance and NDVI between LISS-III and ALI images is feasible. Moreover, both TOA reflectance and NDVI of LISS-III are more similar to those of ALI at band 4 than to those of ALI at band 4P due to the difference in the two NIR bands of ALI.Keywords
Normalized Difference Vegetation Index, Remote Sensing Satellite, Spectral Characteristics, Top-ofatmosphere Reflectance.Full Text
- Mechanisms Underlying Diurnal Variations in the Canopy Spectral Reflectance of Winter Wheat in the Jointing Stage
Abstract Views :251 |
PDF Views:84
Authors
Affiliations
1 International Institute for Earth System Science, School of Geographic and Oceanographic Sciences, Nanjing University, No.163, Xianlin Avenue, Qixia District, Nanjing, CN
2 School of Urban and Rural Planning and Landscape Architecture, Xuchang University, No. 88, Bayi Road, Weidu District, Xuchang, CN
3 Aerospace Information Research Institute, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 20, Datun Road, Chaoyang District, Beijing, CN
4 Henan Key Laboratory of Big Data Analysis and Processing, School of Computer and Information Engineering, Henan University, Jinming Avenue, Longting District, Kaifeng, CN
1 International Institute for Earth System Science, School of Geographic and Oceanographic Sciences, Nanjing University, No.163, Xianlin Avenue, Qixia District, Nanjing, CN
2 School of Urban and Rural Planning and Landscape Architecture, Xuchang University, No. 88, Bayi Road, Weidu District, Xuchang, CN
3 Aerospace Information Research Institute, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 20, Datun Road, Chaoyang District, Beijing, CN
4 Henan Key Laboratory of Big Data Analysis and Processing, School of Computer and Information Engineering, Henan University, Jinming Avenue, Longting District, Kaifeng, CN
Source
Current Science, Vol 118, No 9 (2020), Pagination: 1401-1406Abstract
Information regarding diurnal variations in vegetation canopy spectra and vegetation indices (VIs) is necessary for plant growth modelling. We analysed the diurnal change characteristics of canopy spectral reflectance and VIs of winter wheat in the jointing stage based on field-measured and simulated spectral data. The visible–near infrared reflectance showed a double peak followed by a deep trough. The double-peak period occurred from 11:00 to 13:00 h (UTC + 8), and reflectance fluctuated greatly during this period. This change was attributed to midday depression of photosynthesis caused by stomatal closure induced by strong solar radiation. We found that the vegetation canopy reflectance was mainly affected by photosynthesis rate, solar irradiation intensity and surplus leaf water content. All selected VIs (normalized difference vegetationindex (NDVI), photochemical reflectance index (PRI), water band index (WBI) and mSR705) exhibited distinct intraday variations, and VIs during the double-peak period tended to fluctuate strongly or decrease (NDVI, WBI and mSR705). Thus, field measurements during the double-peak period are not recommended for winter wheat in the jointing stage, with the exception of carotenoid content monitoring. A comparison of VIs showed that SVNIR, NDVI and mSR705 were more sensitive to canopy structure in comparison with PRI and WBI.Keywords
Canopy Reflectance, Diurnal Variation, Jointing Stage, Photosynthesis Rate, Winter Wheat.Full Text
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