基于3S的林场二类调查技术的探讨

讨论了国营林场森林资源二类调查的技术框架,应用3S技术对小(细)班区划调查和分层抽样的各技术环节进行了探讨与研究。在GIS中采用唯一值渲染、等级渲染的方法对树种、单位蓄积量等进行着色,并以此作为分层抽样点布设依据;运用RS结合林班、等高线、特征高程点等矢量数据进行小(细)班区划室内预判;应用GIS对RS数据、等高线、特征高程点、地名标注、系统样点、分层样点、小(细)班区划叠加出图;应用GPS结合罗盘仪引点,减少了野外调查工作量,提高了调查速度和精度。

Discussion on Forest Farm Subcompartment Division Based on 3S Technology

Basd on the research and experiments on division and measurement of subcompartments and stratified sampling with 3S technology,this paper discussed the technical framework of the Forest Management Inventory of the State-owned forest farms,and presented the following aspects: 1)stratified sampling location based on images with the unique value rendering,graduated color rendering in species or unit cumulated volume with Arc GIS; 2)RS data used with forest compartment,contour line,characteristic elevation-noted points and other vector data, and the indoor pre-judgment of subcompartment division; 3)use of GIS for overlap map making with RS data,contour line,characteristic elevation-noted points,place name labeling,systematic sample making,stratified sampling,and sub compartment division; 4)GPS used with compasses and other integrated technological stages of 3S and field forest measurement. The results showed that all these mentioned above not only reduced the outdoor workload but also improved the forest investigation speed and precision.