EDM trigonometric leveling
Infrared trigonometric leveling
ordinary trigonometric leveling
river-crossing trigonometric leveling
the ETS trigonometric leveling
the ordinary trigonometric leveling
trigonometric leveling method
Trigonometric Leveling Network
Underground Trigonometric Leveling
inverse trigonometric function
inversion formula of trigonometric sums
method of trigonometric inter- polation
method of trigonometric interpolation
mixed trigonometric polynomial systems
orthogonal trigonometric function basis
table of trigonometric function
trigonometric control point