Low Cost Aerial Mapping with Consumer-Grade Drones PDF
Preview Low Cost Aerial Mapping with Consumer-Grade Drones
Introduction to Photogrammetry Presented By: Sasanka Madawalagama Geoinformatics Center Asian Institute of Technology Thailand www.geoinfo.ait.asia Content • Introduction to photogrammetry • 2D to 3D • Drones for mapping how it works • Cameras • Cameras for drones • Image formation • Elements of camera • Lens distortions • Illuminance, Aperture and Depth of field • Images • Photogrammetric processing • Flight planning • Photogrammetric GCPs 2 Photogrammetry Photo - light gramma - something drawn metrein - measure Photogrammetry = measuring with photographs Objective is… Inverse the process of photography (i.e. reconstruction of the object space from image space). Results can be, • Topographical/Planimetric/Thematic maps • Coordinates of the required object points • Rectified Photos 3 From Object to Image 4 Inverted Mapping 5 2D 3D Why? Can you used aerial photograph as a map directly? Single Point Perspective The photo scale is different at the tops of the buildings than at the street level. The tops of the building are displaced radially outward relative to their location at the center. 6 2D 3D Why? Can you used aerial photograph as a map directly? 7 2D 3D Why? Can you used aerial photograph as a map directly? Relief Displacement 8 How to prepare maps from Aerial Photographs? Central 3D Aerial Photo -2D Projection Real World Orthogonal Map -2D Ground Model -3D Projection 9 2D 3D 10
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