The actual. character of a specific control point with respect to its
absolute, partial or relative value is of no concern in setting up the corre-
sponding observational equations. In case any control coordinates are given,
it is only necessary to eliminate the corresponding parameter corrections in
TS Absolute terms
Gs
=
the By- matrix. Therefore, no coordinate corrections appear for the absolute
il
Jd
7
control points Nos. l, 7 and 9, the partial control point 3 appears only with
one, and the partial control point 8 with only two coordinate corrections.
The system of corresponding normal equations formed according to formula
(51) is presented in Figure T. |
V. A REFERENCE FOR AN AUXILIARY
COORDINATE TRANSFORMATION
The subject of & specific coordinate transformation is not necessarily
connected with the subject of this report. However, the application of photo-
grammetry, especially for geodetic purposes, unavoidably confronts the user
with the problem of converting geodetic ellipsoidal coordinates (latitude 9,
:
I
L
longitude A, and elevation H, as referred to an ellipsoid of revolution) into
a system of arbitrarily orlented Cartesian coordinates and vice versa.
A solution for this problem is given in [7] under the title "Some Remarks
on the Problem of Transforming Geodetic Ellipsoidal Coordinates into Cartesian
Coordinates with the Help of the Reduced Latitude". Obviously, such a solution
includes the establishment of a geocentric Cartesian system, which is but &
special. case of the general coordinate transformation problem.
VI. DETERMINATION OF RADIAL DISTORTION
Distortion A is positive if the image point is displaced away from the
prineipal point.
tX1
E v y nn R
| ax
Dmm nde en o elt
Ay
b
X X
yp P N m
X :
P |
Figure. 8 Ig Figure 9