Py 
EN 
Á 
200 um 
m 
models, 
500 um 
- 11 = 
(x-Xg, y-y99 corresponding image coordinates referred to the 
principal point (X9; Yo)» 
(XS, YS, ZS) coordinates of the projection centre in the 
terrain system, 
e principal distance, 
as... rotation parameters, given in functions of three 
9 
rotation elements o9, «o, x, which define the 
rotation of the image system with respect to the 
terrain system, 
0145035 coefficients of the polynomial to correct for 
the systematic image deformation. 
A proper formulae must be chosen in advance to describe the 
Systematic errors in the photogram. In the subsequent Bundle 
adjustment, one of the two following adjustment principles is 
used: 
Yvv—min 
Evv + m 07 + Qp Ep, ,)*—min 
When using the latter function, an a-priori knowledge is 
required about the weights Qa or Q,, which symbolize the relation 
between the magnitudes of random and systematic image errors. 
After the adjustment it is necessary to test whether the a-priori 
asgumptions regarding the presence and magnitude of systematic 
image errors were appropriate, If this is not the case, the 
adjustment is repeated with more appropriate assumptions. 
The solution to the above problem may also be obtained by the 
repetitive execution of the foilowing two stages (Masson 
d'Autume 1971): In stage one a conventional least square 
adjustment is performed; in stage two the mean image deformations 
are estimated from the residuals v after adjustment by the 
method outiinea in section 4.1 and the original measurements 
are corrected for this deformation. For an Anblock adjustment 
the results of a numerical example are shown in table 12. 
The gaps between adjacent models in the adjusted block, which 
are due to systematic image errors, can also be eliminated by 
local interpolation (Kraus 1971). In this manner a unique 
mapping of the area is guaranteed.