Study on the simplified model of wind farm in the ridge;

Further,give the mathematical definition of basic lardform shape as the slope,mountain,ridge,depression,groge,saddle,etc.

Derivation of valley line and ridge line by segmental cubic polynomials;

A ridge line extraction algorithm is proposed based on DEM according to the characteristic of the terrain,firstly,the algorithm fills depressions and smoothes the terrain efficiently,then extracts the ridge line and thins it,lastly,the main ridge line is extracted to meet the requirement of the occlusion culling.

The usual method for extracting ridge line and valley line is based on geometric and physical character which is difficult to use the information hiding in the digital data.

Automatic extraction for ridge and valley by vertical sectional method;

Extraction of ridge and valley from DEM based on conjugate terrain;

The authors put forwards a new method which select the terrain profile perpendicular to falling line (opposite direction of gradient) to determine the candidate points on ridge and valley.

Characteristics and significance of the metamorphic minerals glaucophane-lawsonite assemblage in the Hongjishan area, north-central Qiangtang, northern Tibet, China.;

Characteristics and Tectonic Affinity of Lajishan Paleo-Mantle in Qilian Orogenic Belt: A Geochemical Study of Basalts;

Metamorphic Core Complex Structure and Uplifting Mechanism in Lajishan-Hualong Area;

Entering Construction Scheme of Lajishan Tunnel Exit;