MAPGIS技术在1∶5万水系沉积物测量中的应用

Application of MAPGIS on the 1∶50 000 stream sediment survey

传统的地球化学测量提交的成果 ,图件与分析数据表是分离的 ,综合异常专题图是感官上的色块表达 ,而在GIS中 ,地球化学专题资料既可以是利用区图元实体表达的综合异常专题图 ,也可以是原始分析数据或网格化数据 ,不仅可以输出需要的图形 ,还可以进行信息检索、统计和空间分析。将地球化学测量的采样点信息建成MicrosoftExcel数据表 ,与点位空间图形链接 ,形成GIS数据 ,以全区和各类地层为统计单元 ,统计Au含量平均值、均方差、变化系数、分布的样品数量以及可按Au含量对数 0 1为间隔的分组频数 ;据此建立DTM模型 ,可分析金异常分布特征 ,实现 1∶5万水系沉积物测量图形和数据库的微机化制作。

In the result given by the traditional geochemistry survey, maps and analytical data sheets are separated, the composite anomaly thematic maps are just the expression of color block on sense. But in GIS, the geochemistry thematic information could be taken as the composite anomaly thematic map,original analyses data or grid data. It can output the images, retrieve information, statistics information and do some space analysis.Build the data sheets of Microsoft Excel based on the sampling point information of the geochemistry survey and link them with the point space images,and the GIS data was built.Taking whole area and all types of strata as statistics unite, the average value of Au content, errors of mean square,coefficient of variation, amount of distributed samples and grouped frequency are countted.By this method the DTM model was built and it helped to make analysis of the characteristics of gold anomlies,and made it possible to make 1∶50 000 stream sediment survey maps and data base on computer.