OPALS workshop (Feb 23+24, 2011)
TU Vienna, Inst. of Photogrammetry and Remote Sensing
Gusshausstr. 27-29
1040 Vienna
Seminar room 122
Date:
Feb 23, 2011 (9:00-17:00) Workshop Day 1
Feb 24, 2011 (9:00-17:00) Workshop Day
Audience:
The workshop addresses customers, students and/or collaborators from abroad, as well as PhD students from the I.P.F. Whereas 10 seats are reserved for I.P.F. staff, approximately 10 more places are offered in a first-come first-serve principle. Some familiarity with laser scanning is required for profiting from the workshop. The course will be held in English.
Goals:
The aim of the workshop is to provide an introduction into the principles of Airborne Laser Scanning (ALS) and the software OPALS (Orientation and Processing of Airborne Laser Scanning data). First, ALS and OPALS theory is presented in a series of lectures including: Full waveform signal processing and radiometric calibration, quality control, ALS strip adjustment, forestry applications, and concept of OPALS (Day 1, morning session).
The main part of the workshop is dedicated to practical examples using OPALS. The complexity of the data processing will increase gradually. First, the OPALS’ stand alone command line programs will be used to carry out individual tasks (DSM grid computation and visualization, full wave form signal processing) and simple batch scripts will by generated to construct more complex work flows. Detailed OPALS concepts (data filtering, parameter passing, log files, etc) will be introduced by and by (Day 1, afternoon session). Day 2 mainly focuses on more sophisticated scripting concepts and strategies to set up arbitrary processing chains. The scripting and programming language Python is introduced. In practical examples a complete workflow for quality control will be set up (Day 2, morning session). Finally, more packages (improvement of georeferencing, forestry) are introduced and strategies for parallel processing are targeted (Day 2, afternoon). The latter includes the use of multi-core CPUs as well as distributing tasks on multiple computers over the network (grid/cloud computing). The exercise will be conducted in the classroom with 2-3 articipants per computer. The lecturer will be supported by tutors. Participants will gain a deeper understanding of laser scanning and become familiar with OPALS for the exploitation of this knowledge.
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