Document information
| Mapping in a city environment using a single hand-held digital camera |
| Scarmana, Gabriel |
| Event: XXIV FIG International Congress 2010 Facing the Challenges - Building the Capacity |
| Densely populated cities pose a problem for reliable navigation and tracking solutions using GPS. Narrow streets between high-rise buildings blocking GPS signal paths provide limited visibility to satellites and cause multipath effects, resulting in degraded navigation accuracy and reliability. In this context this paper proposes a conceptual framework for a mapping process in an attempt to survey city blocks where the only sensory input is a single low-cost digital camera. This proof-of-concept measuring process begins with taking images of at least two known geo-referenced control points and involves taking sequential images as the user walks forward around a city block. Each image is linked to previous images of the same scene taken from a previously occupied location. Bundle adjustments and registration algorithms compute the direction and orientation between sequential images that, in turn, allows the extraction of 3D information of selected target points visible in the images. Computations are carried out within an office environment using a consumer-grade photogrammetric software program. |
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