自动快速获取林分郁闭度参数是林业信息现代化建设的需求。为快速低成本地计算郁闭度,设计了一种郁闭度自动测定系统。系统利用树莓派及算法编程进行开发,具备野外数据采集和远程信息管理的功能。采用同心圆环切割和二值化相结合的图像处理技术实现郁闭度值提取,避免复杂的鱼眼镜头畸变校正过程。系统提供可视化界面,集成树莓派、鱼眼镜头、电池和无线路由器等,操作简便。以三明市金丝湾森林公园的米槠林为研究案例,使用自动郁闭度测量系统获取林分郁闭度值与抬头望法测定的郁闭度值进行对比分析,得出系统测定的郁闭度值与抬头望法的R²为0.699。系统有助于郁闭度的快速测定。

The requirement of forestry information modernization is to obtain the forest canopy closure automatically and quickly.In order to calculate canopy closure quickly and cheaply,an automatic measurement system was designed.The system was developed by raspberry pie and algorithm programming,which had the function of field data collection and remote information management.Canopy closure value was extracted using ring-cutting and binarization image processing technology.It avoided the complex fisheye lens distortion correction process.The system provides a visual interface,integrated raspberry pie,fisheye lens,battery and wireless router and so on,which makes it easy to operate.This study took Jinsiwan Forest Park,Sanming city as the study case.Canopy closure values determined using the automatic measurement system and look-up method,respectively.It showed that R² was 0.699 between the automatic measurement system and look-up method.The system is helpful for the rapid measurement of canopy closure and provides reference for the application and promotion.