Site-Based Video System Design and Development (2012) / Chapter Skim
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Pages 41-49
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41 C h a p t e r 7 The modular CDAPS design was implemented at an intersection in Ann Arbor, Michigan; it is a suburban intersection between Lohr Road and Oak Valley Drive. Figure 7.1 shows an aerial view of the site.
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42 Sources: Imagery © 2012 Geo Eye; map data © 2012 Google. Figure 7.1.
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43 height be found and included in the various coordinate transformations, but there also were two other important advantages resulting from the survey: • Any static features and reference points visible in a camera image that are also found in the lidar survey can be used for camera calibration, either immediately after installation or later during data collection in case the camera position shifts. presents obvious problems for tracking accuracy; if the camera tracks a vehicle at some distance (for instance, 50 m)
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44 (NAD 1983 Michigan GeoRef, centered at latitude 45.30916667, longitude -86.00000000)
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45 cabinet was fitted to the signal mast immediately above an existing cabinet, which provided 110 V electrical power (Figure 7.6)
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46 main host computer. Camera image collection included the addition of frame-by-frame time stamps -- the GPS trigger time in milliseconds.
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Figure 7.10. Cropped image (992 × 304 subrectangle, SW camera)
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48 From Figure 7.11, it is expected that most through vehicles would be seen by four cameras, and this was indeed the case. Figure 7.12 shows detail of another vehicle, moving at approximately 40 mph through the intersection, as seen by three of the cameras.
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49 Figure 7.14. Radar installation for test and validation.
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