Based on classification and information extraction sub-basin of IDL and Mapinfo

The present invention discloses a method of extracting division information and sub-basin Mapinfo IDL based geophysical scientific fields belonging hydrological science. The present invention is a method of dividing IDL language program using the sub-basin DEM data with high accuracy of a basin by upscaling, good use of the matrix for IDL, high operation efficiency. Through the analysis of the DEM to obtain the sub-division structure basin, geology, geomorphology topological relationship between the sub-basin, sub-basin control point, control of the catchment area, the length of the channel between the sub-basin, slope, etc., to provide support for the runoff simulation. At the same time, using powerful GIS software MapInfo sub-basin division results displayed. IDL is generated based on the topology sub-basin, sub-basin topology display MapBasic programming language sub-basin control point location, use of MapInfo.