Spectra-precision Survey Pro v4.6 Ranger User Manual Manual de usuario Pagina 227

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GPS Overview
217
E
l
l
i
p
s
o
i
d
Mapping Plane
K=0.9996
K=1.0 K=1.0
Central Meridian
K>1.0
K>1.0
K<1.0
Distance on Ellipsoid
Distance on Map
Universal Transverse Mercator Projection
The scale factor at the central meridian (CM) is 0.9996. The scale
factor is 1.0 approximately 170-km east and west of the CM. The
scale factor is less than one between the CM and the point of
tangency. The scale factor is greater than one beyond the point of
tangency. Therefore, at the central meridian, a geodetic distance of
100m scales into a mapping plane distance of 99.96m.
Ellipsoid
Terrain
h
Mapping
Plane
Fig. 3: Transverse Mercator Mapping Plane
A side view of the cylinder shows the effect of scale
distortion.
Fig. 4: Localization Stereographic Mapping Plane
A side view of the ellipsoid and stereographic mapping
plane show the scale calculated for ground distances at
the base height.
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