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Ordnance Survey's experience in creating dense point clouds and ...
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Transcript of Ordnance Survey's experience in creating dense point clouds and ...
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OBLIQUE IMAGERY AT
ORDNANCE SURVEY
David Holland
Ordnance Survey
(with major contributions from
Dave Capstick & Jon Horgan)
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THE BRAVE NEW
WORLD OF OBLIQUE
IMAGERY
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SOME MORE UP TO
DATE OBLIQUE
IMAGERY
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Image credit: Leica Geosystems
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SUNNY
BOURNEMOUTH
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A view from Acute 3D
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Modelled in Acute 3D, viewed in Terra Explorer
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The Bournemouth International Centre
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BACK TO BASE:
ORDNANCE SURVEY
BUILDING
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OS building, oblique view (Leica RCD30 penta)
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OS building, as a 3D mesh (Agisoft Photoscan)
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OS building, modelled in Tridicon
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SOME POINTS TO
CONSIDER
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Some questions
• What format do users need?• The original images
• A bespoke image viewer
• A textured mesh model
• A point cloud
• A “colourized” point cloud
• A 3D city model
• All of the above
• …or none of the above?
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Some questions
• Do we need oblique imagery?• To generate the content we require
• Is nadir (wide angle) imagery good enough?
• Can we integrate data from multiple systems and sensors?
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Some questions
• How should we store all this data?• In indexed flat files
• In a relational database
• In a NOSQL database
• In a linked data database
• Locally, in a server farm, or in the cloud
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Some questions
• Can we generate user-required content?• From the images
• From a textured mesh model
• From a point cloud
• From a 3D city model
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WHAT CAN WE DO
WITH OBLIQUE
IMAGERY?
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3D building extraction
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DSM
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Classified Point Cloud
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Building Classification
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3D buildings - Tridicon
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HOW OBLIQUE
SHOULD WE GO?
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FINAL THOUGHT
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Final thought
• Given all this data, from nadir imagery, oblique imagery, lidar, mobile mapping systems, UAVs, terrestrial scanners and cameras…
…How are we going to manage it all in one place?
?
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Thanks!
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David Holland+44 (0)23 8005 5767+44 (0)7777 664 [email protected]