摘要
以凉水林场1:8 000大比例尺航片上的树冠影像为基础,通过栅格矢量转换、转换算法调整及图层矢量编辑生成了红松(Pinus koraiensis)树冠多边形图层。在ArcGIS中对该图层通过VBA(Visual Basic For Applica-tions)编程调用多边形属性算法,提取红松树冠多边形的重心作为红松立木的坐标,并与实地实时动态差分法RTK(Real-Time Kinematic)精确定位面积为9 hm2的阔叶红松林样地内红松立木坐标数据进行了检验与分析。结果表明,对于胸径(HDB)达到30 cm以上的红松,其坐标提取精度达到90%以上,且径阶越高,提取精度越高。
A crown polygon layer for Korean pine（Pinus koraiensis） was generated by converting raster to vector,adjusting conversion algorithm and editing vector layer based on tree crown images in large-scale（1∶8 000） aerial photographs of Liangshui National Nature Reserve.The center coordinates of Korean pine crown polygons were extracted by polygon attribute algorithm through VBA（Visual Basic for Applications） programming in ArcGIS software,which were regarded as coordinates of Korean pine stumpages.The extracted coordinate data were compared with those of Korean pine stumpages accurately located in a 9-hectare plot of broadleaved Korean pine forest using RTK（Real-Time Kinematic） in the field.Results show that the coordinate extraction accuracy for Korean pines with diameters at breast height（DBH） greater than 30 cm reached more than 90%.The extraction accuracy increased with the increase of diameter class.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2010年第12期31-34,共4页
Journal of Northeast Forestry University
基金
国家教育部本科生创新项目(091022503)
关键词
单立木树冠
红松
栅格转矢量
多边形中心点
坐标提取
Individual tree crown
Korean pines
Raster to vector conversion
Polygon center point
Coordinate extraction
