Doha, Qatar: Photogrammetry is not a new technology, as International Society for Photogrammetry and Remote Sensing (ISPRS) celebrated its centenary on July 4, 2010. With this observation of Dr. Gottfried Konecny, the third day of Map Middle East got off to a start in Doha, State of Qatar.
Dr. Konecny, Emeritus Professor, Institute of Photogrammetry & Geoinformation, Leidniz University of Hannover, Germany moderated the seminar, Photogrammetry & 3D Modelling. In a very interactive way, he recalled the history of photogrammetry and emergence of remote sensing during 5th Salve Conference in 1927. He said that the proud history of the Society can be downloaded from https://ftp.ipi.uni-hannover.de (user ID: konecny Password: ftp-ipi)
Rasmus Lindeneg Johansen from COWI, talked about Doha 3D city model. According to Johansen, the model covers an area of approximately 650 square km (excluding Rass Laffan and Measieed oil plants). All data are available in visualisation platform “GeoAxel” for online streaming. 3D data are available through the Centre for GIS (CGIS) to Qatari authorities and agencies.
Elaborating on 3D datamodel, Johansen said that it is building oriented where one building is one object and has one unique ID. It contains information in the form of various layers like layer for basement, superstructure wall, superstructure roof, basic parapet wall, superstructure parapet wall, canopy basement, pipes, etc. Objective of having a unique ID is to establish a relation between existing building/plot number and any other identifier retained in the building and dwelling registry.
Johansen observed that capturing the data in photogrammetric stereo workstations secures the human interaction and skilled interpretation of building objects in the very early stages of data capture. Semi-automatic modelling and edit tools ensure topological consistent 3D building data. Both Automatic QC tool for geometric consistency and Manual Visual QC secure the high quality of the data.
Caroline Tasse from Vectual-VirtuelCity, talked about the 3D virtual model of Fujairah Emirate. She said that Fujairah is the first government in the region to have its whole territory integrated in 3D in a virtual simulator in high definition data based on GIS. Oscar Custers, Industry Sales Manager, Bentley Systems, UAE, said, “Deployment of 3D city modeling for infrastructure is becoming more mainstream with some of the popular uses like urban planning analysis, noise propagation simulations and flood simulations.” In addition, Custers observed that 3D city model creation and management is still relatively new compared to the classical 2D GIS paradigm.
Jignesh Pattani, Drawing Coordinator, Engineering and Topographic Data Center, Qatar Petroleum, presented a short animated film, 3D Modelling: A Tale of Two Worlds. Through his animated presentation, Pattani conveyed that GIS and plant design systems still struggling to find a way to project their individual coordinate systems, former around the globe and latter, on an engineering virtual world. “Both have ample justification for its preferred methodology and continue to develop and deploy solutions on their chosen world to the extent that now each one trend is to encroach in the other’s comfort zone,” observed Pattani.
Maarten Vandenbroucke, Managing Director, Gatewing, Belgium, observed, “With the introduction of the ultralight unmanned aircraft system (UAS) which is also popularly known as unmanned air vehicle (UAV), a critical mass of technology has been created that puts some photogrammetric capability into the hands of local surveyors who want it.”
Engelbert Breg, Vexcel Imaging, Austria, addressed challenges in the way of integrated workflow. According to Breg, challenges are bigger projects, huge volume of data, increasing processing time, time between capturing and delivering data and weather. So, he suggested some solutions fast IO and visualisation of data and model-based processing. Further, he presented Vexcel’s services and solutions.
Source: Our correspondent