ICS 65.020 CCS B 07 DB42 湖北省 地方 标准 DB42/T 2073—2023 机载激光雷达森林蓄积量建模技术规程 Code of practice for modeling forest growing stock volume based on airborne lidar 2023 - 07 - 27发布 2023 - 09 - 27实施 湖北省市场监督管理局 发布 DB42/T 2073 —2023 I 目次 前言 ................................ ................................ ................ III 引言 ................................ ................................ .................. V 1 范围 ................................ ................................ ............... 1 2 规范性引用文件 ................................ ................................ ..... 1 3 术语和定义 ................................ ................................ ......... 1 4 总体技术要求 ................................ ................................ ....... 2 点云数据要求 ................................ ................................ ... 2 点云密度要求 ................................ ................................ ... 2 采集时间要求 ................................ ................................ ... 2 工作流程图 ................................ ................................ ..... 3 5 准备工作 ................................ ................................ ........... 4 资料收集 ................................ ................................ ....... 4 仪器设备 ................................ ................................ ....... 4 6 样地数据获取 ................................ ................................ ....... 4 样地布设与定位 ................................ ................................ . 4 6.1.1 样地预选原则 ................................ ............................... 4 6.1.2 样地预选方法 ................................ ............................... 4 6.1.3 样地定位 ................................ ................................ ... 4 样地设置 ................................ ................................ ....... 5 6.2.1 样地大小与形状 ................................ ............................. 5 6.2.2 样地数量 ................................ ................................ ... 5 样地调查 ................................ ................................ ....... 5 7 数据处理 ................................ ................................ ........... 5 样地数据处理 ................................ ................................ ... 5 点云数据预处理 ................................ ................................ . 5 8 森林蓄积量建模 ................................ ................................ ..... 6 点云特征提取 ................................ ................................ ... 6 点云特征筛选 ................................ ................................ ... 6 最优模型与超参数确定 ................................ ........................... 6 9 模型精度评价 ................................ ................................ ....... 6 模型评价方法 ................................ ................................ ... 6 9.1.1 决定系数 R2 ................................ ................................ . 6 9.1.2 平均绝对误差 MAE ................................ ............................ 6 9.1.3 均方根误差 RMSE ................................ ............................. 7 9.1.4 相对均方根误差 rRMSE ................................ ........................ 7 精度要求 ................................ ................................ ....... 7 DB42/T 2073 —2023 II 10 森林蓄积量空间分布统计 ................................ ............................. 7 点云特征格网化 ................................ ................................ . 7 森林蓄积量计算 ................................ ................................ . 7 森林蓄积量空间分布统计 ................................ ......................... 7 森林蓄积量空 间分布图 ................................ ........................... 8 11 成果资料 ................................ ................................ ........... 8 附录A（资料性） 树高及郁闭度等级划分标准 ................................ .............. 9 附录B（资料性） 预设样地属性结构表 ................................ ..........