Maura C. Lohrenz

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OBJECTIVE A novel model of measuring clutter in complex geospatial displays was compared with human ratings of subjective clutter as a measure of convergent validity. The new model is called the color-clustering clutter (C3) model. BACKGROUND Clutter is a known problem in displays of complex data and has been shown to affect target search performance.(More)
Set size and crowding affect search efficiency by limiting attention for recognition and attention against competition; however, these factors can be difficult to quantify in complex search tasks. The current experiments use a quantitative measure of the amount and variability of visual information (i.e., clutter) in highly complex stimuli (i.e., digital(More)
When resurveying a seafloor area of interest during change detection operations, an automated method to match found bottom objects with objects detected in a previous survey allows the surveyor to quickly sort new objects from old. The change detection system developed at the Naval Research Laboratory contains modules for automatic object detection, feature(More)
Clutter can slow visual search. However, experts may develop attention strategies that alleviate the effects of clutter on search performance. In the current study we examined the effects of global and local clutter on visual search performance and attention strategies. Pilots and undergraduates searched for an elevation marker in charts of high, medium,(More)
A technique is presented to cluster geospatial features on an electronic display and determine a meaningful measure of display clutter. An algorithm previously developed by the Naval Research Laboratory (NRL) to cluster objects in sidescan imagery has been modified to cluster any displayed features in three dimensions: geospatial location (x, y) and color(More)
The US Navy's aviation platforms rely on cockpit moving-map displays to provide an accurate geospatial representation of a mission area to the warfighter to enhance situational awareness and improve mission effectiveness. Older digital map systems would simply display digitized, paper aeronautical charts to pilots and navigators. Navy systems now utilize(More)
Cockpit moving-maps have provided heightened situation awareness to Navy fighter pilots for over ten years. The Navy now plans to install a moving-map into its multifunction MH-60S helicopter, which will perform sea-based missions such as combat search and rescue and mine countermeasures. The authors surveyed 49 Navy helicopter aircrew for their preferences(More)
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