Transcript First experiences with PHOTOMOD at the Lab. of
A. Georgopoulos, Ch. Ioannidis, S. Tapinaki, S. Ioakeim, I. Papageorgaki Laboratory of Photogrammetry School of Rural & Surveying Engineering National Technical University of Athens (NTUA) [email protected]
First experiences with PHOTOMOD ® at the Lab. of Photogrammetry of NTUA
From Imagery to map: digital photogrammetric technologies – Attica October 2009
Overview
Introduction The Photogrammetry Lab of NTUA Educational & Research activities Instrumentation (H/W – S/W) The contribution of Racurs PHOTOMOD ® Close Range application Aerial photogrammetric application Conclusions
The Laboratory of Photogrammetry
Established in 1917 Education in Photogrammetry and Cadastre (and Remote Sensing until 1988) 3 Faculty members in Photogrammetry 3 Supporting staff (2 Surv. Eng – 1 technical) 10 PhD students
Educational Activities
Photogrammetry courses (undergraduate) 2 compulsory (100 students per year) Photogrammetry I & II (5 th & 6 th sem.) 3 electives Photogrammetry III (7 th sem.) Photographic Data Acquisition (8 th sem.) Photogrammetry summer field course (9 th sem.) Contribution in Metrology (8 th sem.) Postgraduate courses
Research Activities
Digital photogrammetric procedures Digital automation Exploitation of innovative acquisition systems (LiDAR, SAR etc.) Close Range Applications Geometric Documentation of Monuments
Instrumentation
Data Acquisition Systems 2 Digital Cameras (8MP, 21MP) Photogrammetric scanner (Z/I PhotoScan ®) Terrestrial Laser Scanner (Leica ScanStation 2 ®) Structured Light Scanner (XYZRGB SL2) Digital Photogrammetric Workstations Z/I SSK ® Leica LPS ® Autometric Softplotter ® RACURS Photomod ®
RACURS PHOTOMOD ® full local suite
PHOTOMOD Core PHOTOMOD AT PHOTOMOD SolverA PHOTOMOD SolverS PHOTOMOD DTM PHOTOMOD Mosaic PHOTOMODStereoDraw PHOTOMOD VectOr
Contribution
Education Demo in class (Photogrammetry I) Laboratory exercise (Photogrammetry II) Extensive use in the practical courses Research Implementation in Diploma Theses Use in related research projects
Implementation Examples
Close Range Geometric Documentation of a Church in Cyprus Aerial Phtoogrammetry Alternative method for measuring the Classical Marathon Course
Geometric Documentation of a Church in Cyprus Photogrammetric station PHOTOMOD ® Interior orientation Exterior orientation DEM collection Orthophoto Exterior orientation DTM Collection Orthophoto Archis ® Image rectification 10
Products
Façades Cross-Sections Horizontal Section
Alternative method for measuring the Classic Marathon Course
Alternative method for measuring the Classic Marathon Course 34 colour aerial photos, 2005 Z/I RMK Top (c = 153.12 mm) Scale 1:15000 Colour diapositives scanned at 21μm 550 MB per frame
Alternative method for measuring the Classic Marathon Course Aerial images distribution
Alternative method for measuring the Classic Marathon Course Relative Orientation: 0,003 – 0,012 mm Absolute Orientation using bundle adjustment 17 GCP’s 2 Iterations RMS 0.09m in X,Y and Z DTM Automatic ~ 25% erroneous (buildings or large homogenous areas) Orthophoto production
Orthophotography
Conclusions
Advantages Easy to learn Accepts many image formats Flexible in pointing during RO and AO Disadvantages Slow in opening images Problematic in displaying stereo vision Suggestion Incorporation of rectification algorithm