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)
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)
  • Maura C Lohrenz, Michael E Trenchard, Stephanie E Edwards, Chris Cdr, Collins
  • 2002
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 multifunc-tion 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(More)
A critical issue in military aviation is the pilot's ability to transition between primarily internal (head-down, instrument-driven) and external (head-up, out of the cockpit) guidance. Experimental cockpit displays were designed and tested for how well they might support this transition phase for military pilots performing time-critical air-to-ground(More)
EXTENDED ABSTRACT ACDC OVERVIEW This paper describes an Automated Change Detection and Classification (ACDC) system being developed by the Naval Research Laboratory (NRL) for the Mine Warfare group at the Naval Oceanographic Office (NAVOCEANO). ACDC autonomously detects features in sidescan imagery, classifies the features, searches through historical and(More)
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