investigation point meaning in Chinese

调查要点

The paper has made detailed observation by the existing apparatus and the field observation stations . based on the image and the vector database of the yutian oasis , the study has obtained the precise coordinates of investigation points by gps technique , and overlapped them with the images . after classifying the images with the maximum likelihood supervised classification method , we import the result into cis software , and analyze the yutian oasis changes about land cover " s quantity , quality and spatial position from 1976 to 2001
本文利用现有仪器设备和野外观测网站进行详细观测，在建立于田绿洲图像库和矢量数据库的基础上，运用gps技术取得野外考察样点的精确坐标并与研究区各时期影像叠加，对影像进行了最大似然法监督分类，并将分类结果转入gis软件处理，全面分析了1976年至2001年该绿洲的土地覆盖类型数量、质量与空间上的变化。