art BS. Istanbul 2004
de/Kogge/kogge.htm A METHODOLOGICAL PROPOSAL FOR IMPROVEMENT OF DIGITAL SURFACE MODELS
GENERATED BY AUTOMATIC STEREO MATCHING OF CONVERGENT IMAGE NETWORKS
Die Konservierung
MA/konserve.htm J. García-León* *, A. M. Felicísimo, J. J. Martínez ?
* Expresión Gráfica Arquitectónica, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain — (josefina.leon,
Eos Systems Inc., pp. juanjo.martinez)@upct.es
mé neizegeben“ b Ingeniería Cartográfica, Geodesia y Fotogrametría, Escuela Politécnica, Universidad de Extremadura, 10071 Cáceres,
o-dk00021 L.shtml Spain - amfeli@unex.es
Session code PS, WG V/1
ation of the Bremen ;
67.4: pp.372-373. KEY WORDS: Cultural Heritage, Architecture, Statistics, Reliability, Method.
- Anmerkungen zum
alterlicher — Schiffs-
für Unterwasser-
ABSTRACT:
A Digital Surface Model (DSM) generated by automatic stereo matching of convergent image networks includes a great number of
3D-points that come from diverse combinations of stereo-pairs. This points can have a very different accuracy and reliability, in
addition to a great and nondesirable spatial redundancy.
s, The International We analized ditferent methods to generate several synthesis DSM whose points are the result of a statistic process. The aim is to
Sensing and Spatial obtain a regular mesh of points whose Z coordinates are estimated from the whole set of data over the interpolating function. We
istria, Vol. XXXIV choose the best of them using a random mesh of points whose coordinates were measuredby multiple direct intersection.
Xf digital consumer
NTS
; 1. INTRODUCTION
seolnformation (IPI)
unschweig for the The purpose of photogrametric methods basing on automatic
ei D7 metric” for the correlation is to generate massive clouds of points (figure 3).
lera was very stable, García-León et al. 2003 is an example of the use of a
is very high and the convergent geometry (figure 2), from which a great deal of
vas uncomplicated. information has been drawn. This paper also demonstrates that
these data can undergo selection regarding the value of the
correlation coefficient. Selection eliminates bad quality data
and simplifies matters, in spite of which, the amount of
resulting points is still huge. In this paper, a method to filtrate
these points is introduced, in order to achieve a model of
synthesis surface without appreciable loss in accuracy.
Several methods have been used; for example, Kriging, broadly
used in other disciplines and based upon sound statistical
principles, since it ensures an optimal interpolating function.
The aim is to obtaim a regular mesh of points whose Z
coordinates are estimated from the whole set of data over the
interpolating function.
2. DATA
Figure 1. Southern facade of San Mateo Church.
This work was carried out on one of the churches of the
historical centre: San Mateo Church, sited in Cáceres (Western
Spain, city declared World Heritage by UNESCO in 1986). The
Southern facade has a complex design due to the presence of
one tower and some relieves that frame the main gate. All these
elements make this church ideal for our study (Figure 1).
* Corresponding author.
