RESEARCH ON THE OPTIMAL EXPOSURE TIME OF DIGITAL HEMISPHERIC PHOTOGRAPHY METHOD BASED ON LIGHT INTENSITY

被引：0

作者：

Jiao, Shuaifeng ^{[1
]}

Chen, Yunping ^{[1
]}

Wei, Haichang ^{[1
]}

Cheng, Yuanlei ^{[1
]}

Chen, Yan ^{[1
]}

Luo, Chaoming ^{[2
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Automat Engn, Chengdu 611731, Peoples R China

[2] Sichuan Basic Geog Informat Ctr, Chengdu 610093, Sichuan, Peoples R China

来源：

2022 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2022) | 2022年

关键词：

digital hemispheric photography; leaf area index; light intensity; exposure time; AREA INDEX; LEAF;

D O I：

10.1109/IGARSS46834.2022.9884675

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Optimal exposure time is essential for accurate measurement of LAI (leaf area index) by DHP (digital hemispheric photography) method, The results showed that LAI was underestimated in different degrees under automatic exposure mode. To address this problem, in this paper we constructed a model of light intensity and optimal exposure time by studying the quantitative relationship between light intensity under the canopy and exposure time. The result shows that using the exposure based on this model rather than the automatic exposure, the comparison of LAI from the LAI-2200 and digital photographs is greatly improved, with R-2 increasing from 0.398 to 0.845, and RMSE decreasing from 1.298 to 0.293. The method helps to solve the uncertainty of optimal exposure time in DHP method and improve the accuracy of DHP method in LAI measurement.

引用

页码：6236 / 6239

页数：4

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