A. GeorgopoulosA. Georgopoulos, Ch. Ioannidis, S. Tapinaki, S. Ioakeim, I. Papageorgaki, Ch. Ioannidis, S. Tapinaki, S. Ioakeim, I. PapageorgakiLaboratory of Photogrammetry

School of Rural & Surveying EngineeringNational Technical University of Athens (NTUA)

drag@central.ntua.gr

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 (5th & 6th sem.)

3 electives Photogrammetry III (7th sem.) Photographic Data Acquisition (8th sem.) Photogrammetry summer field course (9th sem.)

Contribution in Metrology (8th 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

Photogrammetric station PHOTOMOD ® Interior orientation Exterior orientation DEM collection Orthophoto

Exterior orientation DTM Collection Orthophoto

Archis ® Image rectification

10

Geometric Documentation of a Church in Cyprus

Products

Façades

Horizontal SectionCross-Sections

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