Full text: Proceedings, XXth congress (Part 3)

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geodesy. 
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Irveyor, 
AUTOMATIC AERIAL TRIANGULATION - REPORT OF A LARGE PROJECT 
UNDER DIFFICULT CONDITIONS 
S. Dunkel *, F. Guzzetti ^, G. Otepka * : 
" INPHO GmbH, D-70174 Stuttgart, stilla.dunkel@inpho.de 
“ Politechnico di Milano, I-20132 Milano, franco.guzzetti@polimi.it 
© Ingenieurgemeinschaft Vermessung AVT-ZT GesmbH, A-6460 Imst, otepka@avt.at 
PS WG HV8, Reliability and Performance of Algorithms 
KEY WORDS: Photogrammetry, Triangulation, Block, Large, Project 
ABSTRACT: 
The Provincia Autonoma di Bolzano — Alto Adige commissioned the bidding group GEOSIGMA s.r.L., GEOMATICA s.r.l. and 
Ingenieurgemeinschaft Vermessung AVT-ZT GesmbH to produce a GIS-data base of parts of their province. It was demanded to 
create topographic data for technical base map in the scales 1:5.000 and 1:10.000. For the data acquisition an existing photo flight of 
about 2.500 images was used. 
Following, the most critical parameters of the specific block adjustment are given: 
- An alpine and topographically very challenging region with height differences up to 2.000 m within one image. 
- The photo flight mission was carried out over a period of about 4 months. 4 different aerial cameras have been used for 
taking the images. 
- . The whole area is covered by East-West-flight lines, which are divided in several sub-strips. Additional strips were flown 
along the valleys in lager scales. Thus a very inhomogeneous image pattern exists. 
- . Geometric problems appeared in some of the scanned images. 
This paper presents the realisation of the automatic aerial triangulation using INPHO-software, the gained results and the 
corresponding quality control. 
KURZFASSUNG: 
Die Autonome Provinz | Bozen - Südtirol beauftragte die Bietergemeinschaft GEOSIGMA s.r.., GEOMATICA sır.l. und 
Ingenieurgemeinschafi Vermessung AVT-ZT GesmbH mit der Erstellung eines GIS-Datensatzes von Teilen der Provinz. Dabei sind 
Daten für eine technische Grundkarte in den Mafistüben 1:5.000 und 1:10.000 zu erstellen. Für die Datengewinnung war ein bereits 
vorhandener Bildflug mit rund 2.500 Luftbildern zu verwenden. 
Nachfolgend werden jene Parameter angeführt, die die auszuführende Aerotriangulation besonders erschwerten: 
- A Alpines und topographisch sehr anspruchsvollem Gelünde mit Hóhendifferenzen von bis zu 2.000 m innerhalb eines 
Luftbildes. 
- Die Befliegung erfolgte in einem Zeitraum von 4 Monaten. Dabei wurden 4 verschiede Luftbildkameras eingesetzt. 
- Das gesamte Gebiet wurde mit West-Ost-Flugstreifen beflogen. Wegen der topographischen Gegebenheiten wurden die 
Flugstreifen in Teilstreifen unterteilt. Zusátzlich Streifen wurden entlang der Táler mit gróBerem Bildmafstab erflogen. 
Damit ergibt sich eine sehr inhomogene Anordnung der Luftbilder. 
-  Beieinzelnen Bildern gab es geometrische Probleme in den Scandaten. 
In diesem Beitrag wird über folgende Punkte bei der Durchführung der automatischen Aerotriangulation berichtet: Einsatz der dabei 
verwendeten Software der Firma INPHO, die erzielten Ergebnisse und die ausgeführten Qualitátskontrollen. 
villages. The responsibility of these data sets belongs to the 
community-government boards. The necessary object 
By order of the Provincia Autonoma di Bolzano — Alto Adige catalogues and instructions for the topographic data base exist. 
(PAB) a GIS-dataset will be produced for the whole province ^ For data acquisition photogrammetric methods including 
Alto Adige. These data are used as digital technical base maps additional terrestrial surveys as well as image recognition are 
1. INTRODUCTION 
for the different governmental activities and duties, which were used. 
produced in 4 different map scales. The used scale depends on 
the economic and topographic situations within the area. The In summer 2002 the PAB was tendering the photogrammetric 
map scale 1: 5.000 is used for the settlement regions up to a mapping and dataset production of the central region of the 
height of about 1.500m above sea-level. For the rest of the province with mapping scales 1:5.000 and 10.000. The bidding 
province - these are wooded and mountain areas and pasture- group | GEOSIGMA srl, GEOMATICA srl and 
land - the mapping scale 1:10.000 is used. The responsibility for Ingenieurgemeinschafl Vermessung AVT-ZT GesmbH (A.T.I.) 
these two map scales belong to the PAB. The scales of 1:1.000 ^ won this tender. 
and 1:2.000 are used for the centre-regions of cities and 
ET 
Corresponding author 
633 
 
	        
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