Area Summarization in Establishing the National Resources and Environmental Database
国家基本资源与环境遥感数据库集成中的面积汇总技术

The paper describes the techniques of error minimiz at ion. In the paper, the error is divided into three types: theoretical error such as errors created in the projection from the earth's surface to a plane coordin ate system and in digitizing maps, errors in the procedure of creating thematic d ata from TM images and errors due to the spatial resolution of TM images. Three different methods are adopted in respect to the three types of error mentioned above. To minimize error created due to the TM image's spatial resolution, a ser ies of sampling methods are applied and discussed in detail in the paper. Accord ing to the analysis on the effects of the error minimization methods, especially the sampling methods, there is about 30% cut off from the gross area of farmlan d, and the net area of each land use type is much more close to the actual data.