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Fig. 2 The result of stereoplotting
S.EXEMPLARY ELABORATION
Test data. delivered to the research groups which participate in the
KARLSPLATZ test, by the CIPA, were used for the needs of
experimental works.
A block of 13 non-metric, medium-format photographs
(approximate scale of 1:400) taken with Hasselblad camera was
measured by means of the Stecometer and then its geometric features
were determined with the use of TERRANET and ORIENT package
( elements of external and internal orientation and parameters of
distortion polynomial). Obtained results were entered to the MODEL
SP package. It was stated as a result of analysis of deviations. that
the model was properly constructed and the maximum deviation on
control points equalled to 20 mm (identified points) and the residual
parallax did not disturb observation.
The same data (elements of internal and cxternal orientation and
parameters of Torlegard model of distortion) were utilised for the
model reconstruction on the precise Stecometer with the use of
MODEL ST package. Obtained results prove the proper functioning
of software procedures. The residual parallax has not been observed
for the constructed model and deviations on control points did not
exceed 25mm.
Exemplary continuous elaboration in the discussed technology has
been prepared with the use of the Planicomp P3 analytical stereo
plotter. A file of data conversion to the MicroStation system has
been created by means of the MODEL SP package, in the standard
format. The initial data (resolution, stream type line parameters etc.)
have been selected for the needs of presentation of a facade at the
scale of 1:50 and details at the scale of 120. 15 objects have been
distinguished in the data base (as, for example, an outline of a
building, skeleton lines. details. advertisements, electric installations
dc), each of them has been recorded in a separate layer. Other
attributes have been also assigned to each object (colour. style and
thickness of lines). The effect of stereodigitizing is presented in
Figure 2. A separate designing file has been created for cach façade
of an elaborated object; it is considered as a reference file during the
process of stereo digitising of neighbouring walls of the building.
Thus, as a result of editorial works, it was possible to create a body
of an object with characteristic sections.
441
6.CLOSING REMARKS
Proposed technology of numerical inventory of architectural objects
ensures the high accuracy and quality and limitation of field works,
as well as it allows to utilize non-metric cameras for the needs of data
registration.
Geometric features of particular models are determined in the
process of network solution (terra-triangulation). The inventory
process itself is performed with the use of the stereoscopic effect,
with the use of photogrammetric instruments, which are supported
by specialised software packages. Implementation of the stereo
digitising process in the spatial model ensured the proper spatial
measurement of all elements, independently from the characteristic
features of an elaborated obj ect.
Numerical technology allows to change the form of registration of
results, simplifies and shortens the process of production of
photogrammetric documentation, simplifies archiving procedures,
data management and distribution and allows to automaticallv feed
data bases of the systems of computer-assisted designing.
The way of performed inventory allows to create - by means of
editorial activities - a wide range of presentation possibilities, what
increases the number of customers of photogrammetric
documentation.
Utilisation of non-metric cameras, elaboration of own software used
for the aqustment and modified software which can be used with
modified. precision Stecometers. creates the possibility to promote
the elaborated technology in Poland.
REFERENCES
Georgopoulos, A.. 1992. FotoCAD: A simple photogrammetric
Package for non-photogrammetrists. International Archives of
Photogrammetry and Remote Sensing v. XXIX p.B5 commission
V. XVIIth, Congress of ISPRS, Washington.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996
