Abstract

In flag leaf and flowering stages of winter wheat, unmanned aerial vehicle (UAV)-based and ground-measured hyperspectral data were collected simultaneously, and leaf nitrogen content (LNC) data were then measured in a laboratory. First, the accuracy of UAV-based hyperspectral data was analyzed using ground-measured hyperspectral data, and the analysis showed that the effectiveness and spectrum sampling precision of the UAV-based hyperspectral data are reliable. Hyperspectral characteristic analysis of winter wheat canopies of different LNCs was also conducted. Second, representative spectrum bands that are sensitive to the LNC of winter wheat were extracted through first-order differential spectral, continuum-removed reflectance, and band correlation prediction threshold methods. The optimal band combination that is sensitive to the LNC of winter wheat was obtained by comparing and analyzing the representative spectrum band results. Thus, several LNC spectral indices (LNCSI) were established through ratio, difference, and normalization methods, and linear regression statistical models for quantitatively simulating LNCs were established using the LNCSIs. Finally, comprehensive and comparative analyses of the LNCSIs and the inversion values of the LNC using the LNCSIs confirmed that the LNCSIs are effective in quantitatively inversing the LNC of winter wheat.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Potential of spectral ratio indices derived from hyperspectral LiDAR and laser-induced chlorophyll fluorescence spectra on estimating rice leaf nitrogen contents

Lin Du, Shuo Shi, Jian Yang, Wei Wang, Jia Sun, Biwu Cheng, Zhenbing Zhang, and Wei Gong
Opt. Express 25(6) 6539-6549 (2017)

Analyzing the performance of the first-derivative fluorescence spectrum for estimating leaf nitrogen concentration

Jian Yang, Lin Du, Wei Gong, Shuo Shi, Jia Sun, and Biwu Chen
Opt. Express 27(4) 3978-3990 (2019)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (8)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription