METHOD FOR GENERATING DEM IN PARALLEL ON BASIS OF PSEUDO-DISTRIBUTED CONTOUR LINES

The present invention relates to the technical field of digital elevation models, and disclosed is a method for generating a digital elevation model (DEM) in parallel on 5 basis of pseudo-distributed contour lines. The method includes: extracting contour line layers: extracting the contour line layer of each terrain file; obtaining contour line vector data: obtaining the contour line vector data of each contour line layer; creating triangular irregular networks: creating the triangular irregular networks by using the plurality of contour line vector data respectively in a plurality of hard disks of a same 10 apparatus; generating DEMs: converting and writing the obtained triangular irregular networks into the DEMs in the plurality of hard disks respectively; and generating a global DEM: splicing the obtained DBMS; and generating and obtaining the global DEM. The method in the present invention can solve the problems that an existing processing method needs to spend a large amount of time to carry out data extraction; 15 splicing and conversion; and the entire process has extremely high requirements on performance of a central processing unit (CPU) of a computer and a read-write speed of a hard disk.