Junction is a necessary operation when vector-data entering into database to be stored.The current widespread use of junction is based on map.But the algori
Libo county,the Southern China Karst World Nature Heritage,covers the areas of Maolan National Nature Reserve and Zhangjiang National Key Scenery Park.By th
With the widespread application of GIS,an increasing number of industries involved in GIS result in the appearance of multi-source heterogeneous data source