Leica tps1100, Руководство пользователя, Страница: 357 / 1154

GeoB
ASIC
Reference Manual 5.Standard Functions
TPS1100-Version 1.30 5-35
5.6.4 GM_CalcAreaOfMeas
Description Calculation of area result from measurement.
Declaration
GM_CalcAreaOfMeas_Start( StartPt AS
GM_Measurements_Type )
GM_CalcAreaOfMeas_Add(
CurrPt AS GM_Measurements_Type,
byVal dRadius AS Double,
dArea AS Double,
iReturnCode AS Integer )
Remarks With the first function the calculation of the area of an arbitrary
polygon can be started by defining the start-point (
startPt
,
polar coordinates). The second function allows to extend the
polygon by adding new points. When
currPt equates the start-
point, the area of the now closed polygon will be calculated.
Note The computation is done the plane, i.e. the horizontal
distance is computed and the height is ignored. For the
used formula see Appendix, Geodesy Math. Formulas.
Parameters
StartPt in
start - point of the polygon in polar
coordinates
CurrPt in
current point to be added to the
polygon in polar coordinates
dRadius in
if
dRadius>0
, the connection
between the last point added and the
current point (current edge) is assumed
to be an arc. The area for the arc
segment will be calculated as follows:
( )
( )
F dRadius d d
= × × −
1
2
2
sin
,
where d is the angle change of the arc.
dArea out
Superficies of the closed polygon [m
²
]