海量多文件存储模式的CNSDTF-DEM数据转换方法研究

Study on Transformation Method of Mass CNSDTF-DEM Data Stored by Multi-file Storage Mode

区域高精度CNSDTF-DEM数据的多文件存储模式方便了数据的管理与共享,增加了数据使用的灵活性,但同时也增加了DEM数据使用时数据转换与合并的开销.针对西南某地区应用多文件模式存储的海量CNSDTF-DEM数据作为水库塌岸预测与评价时所带来的格式转换与数据合并的问题展开研究,分析CNSDTFDEM数据与USGS-DEM数据的存储结构,采用C#程序设计语言实现了海量CNSDTF-DEM数据向USGSDEM数据的自动批量转换,并在ArcGIS软件平台下采用VBA宏语言将USGS-DEM数据批量转换为可直接读取的img格式的数据,为区域高分辨率DEM数据的应用提供了便利.

The multi-file storage mode of regional high-resolution CNSDTF-DEM facilitated data management and sharing, and in- creased the flexibility of application, but it also increased the cost of data transformation and mosaic. In a certain project in southwest China, there were mass CNSDTF-DEM data stored with multi-file storage mode which applied to the prediction and assessment of reser- voir bank collapse, so there existed an issue about the file format conversion and data merging. To solve the issue, on the basis of the analysis of storage structures of CNSDTF-DEM data and USGS-DEM data, a batch conversion program using C# language was designed to transform CNSDTF-DEM data to USGS-DEM data, and another batch conversion program using VBA macro language was also de- signed to transform USGS-DEM to . img format which could be directly read and display on the ArcGIS software platform, which facilita- ted the application of regional high-resolution DEM.