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| GEOG0271-2 | Special issues on spatial data acquisition
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| Duration : | 15h Th, 15h Pr |
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| Number of credits : |
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| Lecturer : | Roland Billen, Yves Cornet |
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| Coordinator : | Yves Cornet |
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Language(s) of instruction :
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| French language |
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Organisation and examination :
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| Teaching in the first semester, examination in June |
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Course contents :
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| This course is divided into several sections.
The classes in one section are given by Roland Billen, and deals with lasergrammetric techniques.
The classes in the other section are given by Yves Cornet and deal with the following subjects:
- satellite photogrammetry: model for geometric acquisition using a "pushbroom" scanner (e.g. SPOT 5 HRS)
- calibration of a short base line for mobile stereo-photogrammetric shooting (relative position and orientation of both cameras)
- terrestrial photogrammetry
- aerotriangulation
- use of MicMac, an open photogrammetry software application (http://logiciels.ign.fr/?-Micmac,3-]http://logiciels.ign.fr/?-Micmac,3) |
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Learning outcomes of the course :
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| The first section, dedicated to lasergrammetry, provides information; its objective is to introduce students to modern techniques used to capture 3D spatial data and make them aware of the many different perspectives that were not tackled in class during their previous years of study.
This first section and the next one, dedicated to special topics related to photogrammetry, also aim at helping students understand the need to constantly broaden their technical knowledge during their professional or scientific career, as academic courses are only the first step in a lifelong evolution.
In satellite photogrammetry - one of the subjects studied in the course's second section -, an explanation will be given of the strict geometric model used by "pushbroom" capture systems (SPOT 5 HRS) and the differences with the geometric model studied during the photogrammetry course in the 1st year of the master programme will be identified. Students will carry out a full calculation of the three-dimensional coordinates of several points observed on a pair of images of the Liège region. In mobile photogrammetry - another subject studied in the second section -, students will be introduced to calibrating a photogrammetric acquisition system. Terrestrial photogrammetry - the third subject - will enable them to understand why it is important to have a good approximation of the camera's position in a photogrammetric process. The fourth subject, aerial triangulation, is a method that was not studied during the 1st year of the master programme and is essential to any operational project on aerial photogrammetric survey. The last subject - use of open photogrammetry software application MicMac - will allow students to test their ability to independently develop new professional skills from the basic knowledge acquired throughout their education. |
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Prerequisites and co-requisites/ Recommended optional programme components :
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| Students must have a good understanding of the photogrammetry and applied topography courses from the 1st year of the master programme.
Of course, as with any technical course, this course relies on the students' proficiency in many concepts in the fields of mathematics and physics (geometry, trigonometry, statistics, numerical methods, least squares, etc.). Experience in programming is required, as some exercises will involve MATLAB implementations. It may also be helpful for students to have experience with using various software tools, either self-taught or used during technical and scientific courses in the previous years.
In addition, the mindset that students will have acquired during technical and scientific courses in their academic studies and - if possible - their secondary education is also essential. |
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Planned learning activities and teaching methods :
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| The section dedicated to lasergrammetry provides information, and consists in a presentation and a demonstration of acquisition and processing using the equipment and software of the Geomatics unit.
The learning activities in the photogrammetry section consist in a brief lecture on processing methods for each topic, followed by a practical application of these methods. This exercise is carried out under supervision, from a given data set and using the software tools available. As the exercises involve calculations, we encourage students to use programming languages such as MATLAB, for which the ULg has licenses, or Octave and Python, which are free. For less complex calculations, Excel can also be used.
Students are free to use the university's Idrisi license as well as other software applications through the ULg's VPN. For information on how to access these applications, students can visit the following web page: http://www.gitan.ulg.ac.be/cms, which also features the timetable of the computer room (B5a/4/18). Students can also use other rooms (B5a/2/35), and may contact the Geomatics unit if they wish to practise or advance in their practical assignment. |
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Mode of delivery (face-to-face ; distance-learning) :
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| For the lasergrammetry section, students will sit through a brief lecture and take part in a full demonstration of a capture and processing operation. Attendance is mandatory.
For the photogrammetry section, the learning activities consist in a brief lecture followed by a practical exercise on a topic of the students' choosing. The goal is for students to learn how to work independently in order to solve new technical problems that are specific to photogrammetry: this skill is essential in a professional context, and calls upon this method of data collection. Some of the exercises in this section on photogrammetry will be done outside class. |
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Recommended or required readings :
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| Digital copies of technical reference documents, technical/scientific articles and book chapters are made available to students. Of course, we also encourage students to carry out personal research on technical and scientific documentation on the topics studied in class, in order to develop their knowledge. |
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Assessment methods and criteria :
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| An ongoing non-certifying self-evaluation is carried out during demonstrations and exercise sessions, through close interaction between students and teachers.
The certifying evaluation only concerns the photogrammetry section, and will be based on a presentation by each student of the methods of calculation, their implementation and the results obtained. Two supports will be used: digital slides explaining the solution adopted, and the source code of the programmes developed by the student as well as a demonstration of their execution.
The assessment criteria are as follows: Clarity, coherence, logic, meticulousness, precision, completeness, brevity, relevance, cross-cutting nature (within the course and between courses), quality of mathematical (mathematical meaning of the different coefficients of the equation, e.g.), physics (dimensions and units, order of magnitude - scaling, e.g.) and geographical (single and multivariate spacial and temporal interaction - type- and meaning of the variables e.g.) interpretations. Critical thinking with respect to the data used (qualification, nature, meaning, representativeness, standardization ...) and methodological choices (justification of the choice of methods, appropriate thresholds, ...) will also be taken into consideration in the evaluation. Furthermore, answers will also be evaluated based on the quality and the originality of the graphic illustration since graphic expression is the scientist's specificity. It further allows demonstrating a good understanding of the phenomenon. Finally, enriching an answer with a rich personal scientific culture will also be considered a factor of excellence in the assessment. |
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Work placement(s) :
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Organizational remarks :
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| The schedule for each year will be provided by the secretariat of the Geography department. If needed, dates can be changed depending on the students' wishes and the availability of teachers or equipment. However, the course must be completed by the end of the first term, although reports can be handed in during the second term by a deadline that will be discussed with the students. The evaluation be carried out after the reports are handed in. |
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Contacts :
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| Roland BILLEN, Professor
Geomatics unit, 17 (B5a), Allée du 6 Août, 4000 Liège
Phone #: +32 4 366 36 37
E-mail: rbillen@ulg.ac.be
Web: http://139.165.44.35/cms/index.php
Yves CORNET, Professor
Geomatics unit, 17 (B5a), Allée du 6 Août, 4000 Liège
Phone #: +32 4 366 53 71
E-mail: ycornet@ulg.ac.be
Web : http://139.165.44.35/cms/index.php |
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| Items online : |
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| Course notes |
| Course materials can be downloaded on the ULg's eCampus platform. |
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