bim fRom A distAnce – pARt ii PART I OF THIS ARTICLE INTRODUCED THE CONCEPT OF USING SATELLITES FOR CONSTRUCTION SITE MONITORING, AND THE SCSI PROJECT INITIATED TO RESEARCH THIS CONCEPT FURTHER. PART II LOOKS AT THE OUTPUTS OF THIS RESEARCH SO FAR.
t
he study area for this project is located in the inner part of Dublin Bay on the east coast of Ireland.
The
Alexandra
Basin
Redevelopment (ABR) Project is located in the approaches to Dublin Airport and 2.5km south west of a nature and bird sanctuary, limiting options for aerial or remotely piloted aircraft systems (RPAS) surveys. The ABR Project is the
first part of the larger redevelopment of Dublin Port that forms part of Dublin Port Company’s Masterplan 2012-2040.
results The output of the photogrammetric process was a point cloud coloured by elevation, as illustrated in Figure 3a, where blue represents low elevations (e.g., the ground) and red represents high elevations (e.g., building roofs). The synoptic potential of satellites as a mapping tool is reinforced in Figure 3b, as this displays the extent of data captured during a single acquisition with multiple potential applications. Despite a focus on a single test site, the images covered the whole of Dublin city and we were able to map this in 3D from a single satellite overpass. The high spatial resolution of the Pléiades satellite imagery results in approximately one point per pixel, i.e., four points per m2, a density not dissimilar to many conventional airborne light detection and ranging (LiDAR) platforms.
feAtuRe
Aidan Magee Doctoral candidate at Maynooth
Stephen Purcell FSCSI FRICS MIPI
dr conor cahalane FSCSI FRICS
University
Director, Future Analytics Consulting Ltd
Department of Geography, Maynooth University
dr Avril Behan FSCSI FRICS
Eimear Mcnerney FSCSI FRICS
darragh Murphy
Lecturer and Assistant Head of the School of
GIS and Mapping Specialist, Planning and Asset
GIS and EO Analyst at Mallon Technology
Multidisciplinary Technologies, TUD
Management, ESB.
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SURVEyORS JOURNAL Volume 9, Issue 2, Summer 2019