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Proceedings, XXth congress

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004
photographs have not been used, as it is expected, that these are
the areas of grossest distortion.

i o o
: es © Os sera

T5 RE eh

Figure 2. Point location
2.3. Results
The co-ordinates of 33 geodetically determined points have
been measured from the stereo model. The differences between
geodetical co-ordinates and the ones, defined by
photogrammteric method, have been calculated, as well as the
RMS of photogrammetrically defined co-ordinates (see
Ttable 1).
RMS [cm
along axis X
along axis Z
lane XZ
in debt (along axis Y) +6.1
Table 1. Accuracy assessment
in picture

The co-ordinates, established by photogrammertric method have
been examined for systematic errors, whereas the theoretical
and empirical values of the mean absolte errors and median
Theoretical = 0.80 m (4)
Viheoretical = 0.67 m
where; r is the mean absolte error,
m is the RMS,
V is the median error.
The comparison shows standard distribution of errors of
photogrammetrically defined co-ordinates (see Table 2 and
Table 3).

Mean absolte X [em] Z [em] Y [em]
Empirical +1.0 xi. XS. 1
Theoretical +10 £1.1 t4.9
Table 2. Mean absolte error
Median X [cm] Z [cm] Y [cm]
Empirical +0.8 +0.9 +4.7
Theoretical +0.8 +1.0 +4. 1

Table 3. Median error
The frontage of the building has been vectorised in stereo mode,
the three dimensional model (DTM) of its surface and ortho-
image have been created. The co-ordinates of 30 points have
been recognised from the ortho-image and have been compared
"to the ones, obtained from the geodetic measurements. The
RMS for the location of points from ortho-image has been
calculated to be + 2.2 cm.
e The shortcomings of non-metric camera can be eliminated
by usage of special software.
e In order to make adjustment by means of self-calibrating at
least 5 control points or 9 control distances must be
measured. Having known camera parameters, the number
of control data is reduced.
e The accuracy of the ortho-image directly depends on the
quality of the digital three dimensional model (DTM) of
the object and does not exceed the one of the stereo model.
e The unknown lens distortion and the inconsistency of the
parameters of internal orientation did not render systematic
influence on the results of the experiment.
e The results from the experiment show, that this method
completely meets the requirements of the assigned task and
could successfully be applied, being an inexpensive and
efficient technology for application in various fields, such
as preservation of building frontages of cultural
l. Non-topographic photogrammetry, 2nd edition. 1989,
American Society for Photogrammetry and Remote
Sensing, Falls Church, Virginia.