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4 results for "higher-resolution data"
Exploiting New Data Sources to Quantify Arterial Congestion and Performance Measures at a Regional Scale By Miguel Figliozzi
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Travel time and operating speed influence transit service attractiveness, operating cost and system efficiency. As part of their bus dispatch system (BDS), the Tri-County Metropolitan Transportation... More > District of Oregon (TriMet) has been archiving automatic vehicle location (AVL) and automatic passenger count (APC) data for all bus trips at the stop level since 1997. In 2014, a new and higher-resolution bus AVL data collection system was fully implemented. The new AVL system provides stop-level data as well as five-second resolution (5-SR) bus position data between stops. This research project explored potential applications of the new data for assessing transit performance and for estimating transportation system performance measures for urban streets and arterials. Results suggest that the 5-SR data provides high-resolution time and position information which can be used to determine bus travel speeds between bus stops, identify speed breakdowns, and estimate intersection signal/queuing delays.< Less
OTREC-RR-11-23 By Michael Olson et al.
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Geologic hazards such as coastal erosion, landslides, seismic loading, etc. constantly threaten public highways. Terrestrial laser scanning surveys enable rapid 3D data acquisition to map and... More > analyze the processes behind these events. Previously, change detection and analysis was conducted back in the office. A new algorithm quickly geo-references scans and detects changes by comparing to baseline models. This algorithm has been integrated with a simple, intuitive GUI. Change detection in the field offers significant advantages to post-processing workflows. First, it allows key observations while still on site. Second, it can improve the efficiency of the survey, allowing areas of minimal change can be surveyed at coarser resolutions and areas of substantial change can be scanned at higher resolutions, reducing processing time and data maintenance. Finally, this method provides immediate validation and quality control, improving data confidence and allowing issues to be resolved on site.< Less
OTREC-RR-11-23 By Michael Olson et al.
Paperback: $5.44
Prints in 3-5 business days
Geologic hazards such as coastal erosion, landslides, seismic loading, etc. constantly threaten public highways. Terrestrial laser scanning surveys enable rapid 3D data acquisition to map and... More > analyze the processes behind these events. Previously, change detection and analysis was conducted back in the office. A new algorithm quickly geo-references scans and detects changes by comparing to baseline models. This algorithm has been integrated with a simple, intuitive GUI. Change detection in the field offers significant advantages to post-processing workflows. First, it allows key observations while still on site. Second, it can improve the efficiency of the survey, allowing areas of minimal change can be surveyed at coarser resolutions and areas of substantial change can be scanned at higher resolutions, reducing processing time and data maintenance. Finally, this method provides immediate validation and quality control, improving data confidence and allowing issues to be resolved on site.< Less
Assessment of spectral properties of Apollo 12 landing site By Yann Chemin
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The geology and mineralogy of the Apollo 12 landing site has been the subject of recent studies that this research attempts to complement from a remote sensing point of view using the Moon... More > Multispectral Mapper (M3) sensor data, onboard the Chandrayaan-1 lunar orbiter. It is a higher spatial-spectral resolution sensor than the Clementine UV-Vis sensor and gives the opportunity to study the lunar surface with a comparatively more detailed spectral resolution. The M3 signatures are showing a monotonic featureless increment, with very low reflectance, suggesting a mature regolith. The regolith maturity is splitting the landing site in a younger Northwest and older Southeast. The mineral identification using the lunar sample spectra from within the Relab database found some similarity to a basaltic rock/glass mix. The spectrum features of clinopyroxene have been found in the Copernican rays and at the landing site. Lateral mixing increases FeO content away from the central part of the ray.< Less

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