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Programs
Leica TPS800-4.0.0en
Basic Terms - Elements of a Road Project
Road projects consist in general of a horizontal and
a vertical alignment.
Any project point P1 has E, N and H coordinates in
a determined coordinate system and has three posi-
tions.
P1 '
Position on natural surface
P1 "
Position on vertical alignment
P1 '"
Position on horizontal alignment
With a second point P2 the alignment is defined.
P1 ' P2 '
Projection of the alignment onto the
natural surface
P1 '' P2 ''
Vertical alignment
P1 ''' P2 ''' Horizontal alignment
a
Grade, angle between the vertical and
horizontal alignment.
a
Natural Surface
b
Horizontal Alignment
c
Vertical Alignment
TPS800_Z104
P1’
P1’’’
P2’
P2’’
a b c
P2’’’
P1’’
