Ron Roth, Product Manager Airborne Topographic LiDAR, Leica Geosystems Improvements in City Modelling by Fusion of Airborne LiDAR and Oblique Imaging

Why city modeling? motivation for Leica RealCity solution “Managing urban areas has become one of the most important development challenges of the 21st century. Our success or failure in building sustainable cities will be a major factor in the success of the post-2015 UN development agenda.” - John Wilmoth, Director - UN DESA Population Division Trend toward urban migration – 54% of population in urban areas Larger, more dynamic cities – 28 mega-cities (>10M population) in 2014  41 in 2030) Decision support requiring shared, timely, detailed, multi-dimension data to get the most from geospatial information DMC III Image: Midwest Aerial Source: World Urbanization Prospects, UN DESAs Population Division, 2014

Outputs of city modelling: textured mesh for visualization

Outputs of city modelling: CAD models for quantitative analysis

Oblique Imaging: flight line layout and camera configuration

Leica RealCity – the industry’s first hybrid sensor solution purpose-designed LiDAR, oblique imaging and unified workflow

Leica CityMapper hybrid sensor greater speed and accuracy in urban mapping applications Current technology limited by creation of meshes or point clouds from dense matching of nadir and oblique images Hybrid LiDAR/Oblique Imaging solution provides: Better detection of ground in vegetated areas and better differentiation of vegetation from structures More accurate 3d models…faster Top image: image-derived point cloud and building model (note misrepresentation of road surface) Bottom image: LiDAR point cloud and building model

Leica CityMapper first hybrid sensor combining LiDAR and oblique imaging Purpose designed 700 kHz oblique- scanning LiDAR 4-band (RGBN) RCD30 CH82 imager for nadir/ortho images (4) RGB RCD30 CH81m imagers for oblique data collection

Project settings Flying height 1326 m AGL Speed 130 kts (~65 m/s; <111 m/s is frame rate limit) Scan rate 100 Hz Pulse rate 516 kHz (5PiA) Point density 5-8 points/m^2 single pass Lens configuration 80 mm nadir / 150 mm oblique Frame interval ~2.8 seconds (1.5 seconds max) Forward overlap (nadir) 60% (74% actual) Overlap (side oblique) 60% @ inner edge GSD 8.3 cm

Point cloud

RGB mesh over point cloud

RGB mesh over point cloud

Mesh over point cloud

HxMap for Leica RealCity workflow for all Leica airborne sensors Processes imagery from CityMapper LiDAR scanner and nadir/oblique cameras…in a single application Accelerates data delivery with distributed processing Creates a wide variety of data products in industry-standard formats and wide variety of projection systems: the SmartBase Orthophotos / Obliques (RGB, CIR) Point clouds (with intensity, RGB, CIR) Meshes / City models

Learn more about Leica RealCity Visit us at HxGN LIVE 13 - 16 June 2017 Las Vegas, NV, USA hxgnlive.com/2017

Contact us for more Information North & Central America jean.gardiner@leicaus.com South America joao.rocha@hexagon.com Europe, Middle East, Africa hartmut.rosengarten@leica-geosystems.com Russia michael.petukhov@leica-geosystems.com China bin.du@leica-geosystems.com.cn Asia Pacific rolf.schaeppi@leica-geosystems.com India ratan.awasthi@leica-geosystems.com