Andrew Crowell

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General trees are usually displayed as planar straight-line grid drawings which provide an easily understandable structure to the viewer. Current general tree drawing algorithms have one common problem: their drawings on high degree trees produce many small angles, which makes it difficult to distinguish edges. The algorithm we propose in this paper allows(More)
The Federal Aviation Administration (FAA) and supporting organizations are developing new concepts to improve efficiency and safety of the National Airspace System (NAS). Some of these concepts change current restrictions, introduce new maneuvers, or provide better decision support to air traffic controllers. Each of these concepts requires extensive(More)
The analysis of large sums of data can be extremely difficult to perform if the data is not presented graphically. As a result, many graphing techniques have been developed, such as scatter plots, histograms. Generally, the main purpose of graphically displaying data is to do one of two things: First, to find the general average of where most of the data(More)
In the concept development and validation process, fast-time simulation and modeling exercises are performed to examine system performance, obtain initial assessments of potential benefits, and to identify potential problem areas where real-time simulation studies are necessary for further exploration [1]. Despite the immense impact weather has on the(More)
The quality of a graph drawing algorithm is often measured by its edge crossings, angular resolution, aspect ratio, and node labeling. Algorithms for drawing trees in general are segregated from algorithms for drawing graphs. In this paper we present a graph visualization system that uses a novel interconnection between a tree drawing algorithm and graph(More)
A new graphic visualization tool, Trajectory Galaxy Visualization (TrajGalaxyViz) has been developed that significantly enhances analysts' ability to determine the accuracy of flight trajectory predictions, i.e. the anticipated route of an aircraft. The partnership between the Federal Aviation Administration's Conflict Probe Assessment Team (CPAT) and the(More)
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