GreecePHOTOMOD Lite Project Contest
Nomination: Education with PHOTOMOD Lite
Institute name: Laboratory of Photogrammetry, School of Rural and Surveying Engineer, National Technical University of Athens
Contact Person: Andreas Georgopoulos, Sevasti Tapinaki
e-mail: email@example.com, firstname.lastname@example.org
The Laboratory of Photogrammetry and the staff employed in it are the part of Topography Department
of the Rural & Surveying Engineers School of Athens National Technical University.
Photogrammetry in the Greek Universities is only lectured in the School of RSE of the
NTUA and of Thessaloniki Aristotle University.
NTUA's Laboratory of Photogrammetry assignment is to fully educate and train the students on Photogrammetric issues, encouraging
also relative research. At the same time, the Laboratory's infrastructure is constantly updated
and improved, in order to serve its objectives in the above mentioned sectors.
Research in the Laboratory of Photogrammetry is carried out by the staff of Topography Department
relative to the thematic area of Photogrammetry. It consists of research projects
funded by various sources, independent scientific research and PhD Theses supervision
and elaboration. The results of all that research activity is presented in the publications of the
Laboratory members. The Laboratory of Photogrammetry is aiming to “produce” new
knowledge and to educate new theoretical and practical Photogrammetry researchers through
basic and applied research procedures. More specific research issues are digital cartography
and automations, measurements on simple images, large scale surveying, G.I.S. applications,
According to the UnderGraduate Studies Program of the SRSE — NTUA the Laboratory of
Photogrammetry is responsible for the education and training of the Faculty's students on the
following areas, through courses and Master Theses attendance. The courses being taught by
Laboratory members are:
|Photographic Data Acquisition
|Summer Photogrammetry Practice
|Surveying and Documentation of Monuments
The Laboratory is also involved in the educational procedures of the post-graduate programs:
“ GeoInformatics” (SRSE — NTUA), and “Monuments Protection” (School of Architecture).
The last five (5) years the Laboratory is using PHOTOMOD for educational purposes in mainly
three of these courses: Photogrammetry II, Summer Photogrammetry Practice and Surveying
and Documentation of Monuments. The extensive use of the PHOTOMOD Lite version has given
the opportunity to use a digital photogrammetric system for the practice and training of many
students at the same time. The students have the opportunity to exploit the availability of the
Lite version in order to train at home.
Course Photogrammetry II — 6th semester
This course is being taught at the 6th semester of the school and its aim is to educate and train
the students on the following main areas:
Methods for Aerial Triangulation (independent stereopairs and bundle adjustment)
Digital Terrain Model production
Satellite images and photogrammetry
At the same time the students have to elaborate and deliver exercises based on the theory
where some of them are being elaborated using PHOTOMOD Lite.
The duration of the course is 13 weeks with two two-hour lectures per week. The necessary
lectures for the theory of a certain area are followed by one lecture for the assignment of the
exercise based on this theory. The website of the course
ecourses.dbnet.ntua.gr is being constantly updated during
the semester and contains the course material (lectures slides, exercises), announcements etc.
During the 6th semester of 2012 approximately 100 students attended in total 30 hours of
lectures for theory and 18 hours for the assignment of the following exercises:
|Exercise 2 and 3
||Photogrammetric Orientations (Interior, Relative) using PHOTOMOD Lite
||Accuracies of stereo restitution
||Aerial Triangulation using PHOTOMOD Lite
||Stereoscopic drawing using PHOTOMOD Lite and anaglyph glasses
||Automatic creation of DTM and Orthorectification of images using PHOTOMOD Lite
The delivery date was set two weeks after the assignment of each exercise. For each exercise
the students had to compose a technical report and deliver them, along with the products, to
certain email addresses, that were created especially for this purpose. The exercises were being
corrected and the students received a reply mail with comments and corrections.
One strip flight with five (5) aerial images of the National Technical University Campus.
The calibration certificate of the camera.
A txt file with fifteen (15) ground control points coordinates in GGRS87 / Greek Grid
coordinate system with coordinate accuracy 0.10 m.
A pdf file with the description and the exact position of the control points.
Pdf files with instruction manual in Greek that was especially written for each exercise.
The manual contains all the processing steps and tools of PHOTOMOD Lite that the
students had to use for the exercises and also all the parameters that they had to
define. This material was based on the extensive and comprehensive on-line manual
which comes with both the Lite and the Normal versions.
The .exe file for the installation of PHOTOMOD Lite.
The source aerial images were captured in August 1999 using the RMK TOP 15 with the
parameters shown in and they images were scanned using the Z/I PS1 photogrammetric
scanner with pixel size 14 μm namely 1800 dpi image resolution.
For the exercises 2, 3, 5, 6 and 7 that where elaborated using PHOTOMOD Lite the laboratory
supplied the students with the following materials:
|Scale of source images ≈1:6000
||Calibration date 02/02/1999
|Camera type Film
||X: 0.007 mm
Y: 0.001 mm
|Focal length 152.611 mm
|Point of symmetry (zero distortion)
|| To principal point
The Block Scheme of the Strip
The lectures for the assignment of the exercises were given in the GeoInformatics Center (GC)
that was established in March 1996 and is the focal point on Information Technology at the
School of Rural and Surveying Engineers. The GC provides among others thirty-four (34) Dell
Studio XPS Intel I7 2.8 GHz, RAM 4GB, HD 500GB, VGA 512 MB ΑGP, DVD-RW, Ethernet Gigabit,
18.5’’ TFT monitor and twenty-five (25) Dell GX620 Intel PΙV 3 GHz, RAM 1GB, HD 80GB, VGA
128 MB ΑGP, DVD-ROM, Ethernet Gigabit, 17' CRT monitor.
The hardware used for the elaboration of the exercises was mainly the personal computers of
GC but also some student’s personal computers and laptops with unknown characteristics to
us. The projector of GC was used for the presentation and the explanation of PHOTOMOD Lite.
Course Summer Photogrammetry Practice – 8th Semester
The main objective of the course Summer Photogrammetry Practice is the familiarization of the
students with the application of basic photogrammetric processes.
The specific objectives of the course which are equal to each other are:
I. The acquaintance with an integrated photogrammetric project
II. The consolidation of theoretical knowledge on all subjects of the undergraduate curriculumnot
only on the Photogrammetry — by clarifying any obscure concepts
III. The editing and production of final products
During this course, which lasts 25 full-time days usually in July the students undertake to
complete specific projects on photogrammetric issues, such as development of software for
photogrammetric calculations, production of orthophotomaps, bibliographic research, etc.
Especially for those students who chose to join the team that does part of the course at the
archaeological site of Kimisala in Rhodes Island the practice employs the integrated nature of a
professional work. In this sense the students are invited to experience all stages of a
photogrammetric work, namely:
planning of image acquisition,
selection of place and marking of ground control points,
data collection in the field,
check and controls
photogrammetric processing and
editing of final delivery
Eleven (11) students attended the course that took place on July of 2011. The subject of the
project was the production of the orthophotomap of the road network part of the
destroyed ancient city of Vasilika in the Kimisala archaeological site in 1:50 scale.
The source images were captured using the digital camera CANON MIII and a lens of focal
length 24mm. The stereopairs had 70-80% overlap.
The ground control points were measured with a total station and the coordinates were
calculated in Cartesian Right (Local right Cartesian reference system) only oriented to the North
of GGRS’87, with coordinates’ accuracy 0.01m.
For the needs of the shooting from a height of about 6-7 m a special construction of tripod was used.
In this project PHOTOMOD was used for close range photogrammetry. All the photogrammetric
processing was made in PHOTOMOD Lite and the orthoimages with cell size of 0.005 m were
produced in PHOTOMOD Mosaic module. The necessary stereoscopic processing was made
using anaglyph glasses.
The collection of DTM was made manually with a lot of breaklines and not so many individual
points because of the odd shapes and forms of the stones.
The final orthophotomap was created in AutoCAD.
Course — project Surveying and Documentation of Monuments — 9th Semester
This course-project is being taught at the 9th semester of the curriculum and its aim is to
educate and train students on the Geometric documentation of monuments with
topographic and photogrammetric methods. The goals of this course-project are:
A. Integration of the already gained knowledge (geodesy, Photogrammetry, least squares
B. Supplementation with new knowledge
C. Raising awareness on cultural Heritage issues
D. Practical application
During the semester there are lectures for theory relating to:
History of Architecture
“Reading” of monument
Digitalization of Cultural Heritage
Accuracy networks, Monitoring of deformation and micromovements
Collection of 3D data
Products of Geometric Documentation (specificities, demands, 2D-3D, differentiation from conventional products)
Information Systems of Monuments
At the same time students have to deliver certain products for a certain monument usually in Athens.
During 2012 ten students attended this course and the monument that they documented
was the Temple of Hephaestus. The Temple of Hephaestus (also called Thissio) is one of the
most preserved ancient Greek temples of Space. It was dedicated to the god Hephaestus and
Athena Ergani. Located in the area of Theseus this got its name because of the old now revised
version of the temple to Theseus. The Temple of Hephaestus is accessible to the public as part
of Ancient Agora archaeological site.
The products that the students were asked to deliver were:
one horizontal section at a level of 1.1m above the main floor at a scale 1:50
one vertical section that shows the main entrance at a scale 1:50
and a part of the south façade at a scale 1:50
The two sections were measured with a total station and produced only vector drawings.
The façade had to be a raster and vector drawing so it was decided to use photogrammetric
methods and finally produce orthoimages using the PHOTOMOD Lite. In this project
PHOTOMOD was used for close range photogrammetry.
The students trained on how to:
Plan the image acquisition for the stereopairs,
Mark the ground control points and measure them with a total station,
Calibrate the camera
Perform the photography themselves
Use the PHOTOMOD Lite for the photogrammetric orientations and the production of
The fieldworks lasted two days while the office work lasted four weeks considering the
educational nature of the project till the final delivery of the Temple south facade drawing.
The source images were captured using the digital camera CANON MIII and a lens with focal
length 24mm. The same camera set with the previous mentioned course.
Finally two strips were made with approximately 70% overlap:
one for the upper part of the Temple containing the columns and the top part consisting of 15 images
and one for the stairs of the Temple, consisting of 16 images
The collection of DTM was made manually and because of the strong anaglyph of the object
considering the large scale images strange and wrong triangles were created in the TIN.
The problems with the strange triangles were solved with the decision to create separate TINs
for several elevations. Finally five elevations were defined such as the three elevations of the
stairs one elevation for the columns and one for the wall of the Temple.
DTM for the three elevations of the stairs
The produced orthoimages were imported in AutoCAD were the final drawing was produced.
Photomod software is also extensively used in Diploma theses (i.e. Master’s theses) when they
are concerned with the production of photogrammetric products such as vector drawings or
It is evident that within the curriculum of the School of Rural & Surveying Engineering full
exploitation of the Photomod software is being made. Especially the availability of the Lite
version gives the opportunity to all students to gain real hands-on experience to a Digital
Photogrammetric Workstation. In this way they are fully equipped to confront any
photogrammetric project in their professional life after graduation.
Download a full description of the project (PDF, 2,8 MB)