The invention provides a three-dimensional
terrain model real-time smooth drawing method with combination of a GPU technology, and belongs to the technical field of
image processing. The objective of the invention is to provide the three-dimensional
terrain model real-time smooth drawing method with combination of the GPU technology so that cache reuse in multiple times of drawing can be realized based on the current popular programmable GPU technology with a global
digital elevation model acting as a
data source, and load of computation space is effectively reduced. The method comprises the steps of construction of a multi-resolution
pyramid model,
elimination of
image noise points, filtering of images, partitioning of
planar projection of the earth according to equal
latitude and
longitude, and construction of different hierarchical levels of
pyramid layers according to a mode from the top to the bottom. Acceleration and enhancement of
terrain rendering are realized based on the programmable GPU technology, i.e. all phases of a graphical drawing pipeline are controlled by using
shader languages, two and textures are respectively generated by vertex information and index information of
elevation data to be stored in
video memory for scheduling of whole terrain drawing; and vertex interpolation and migration are performed in the
geometric phase by utilizing a curved surface
subdivision and fractal technology so that procedural details are generated and the phenomenon of edges and corners of the terrain mesh when resolution is insufficient can be compensated.