| A Measure of Search Efficiency in a Real World Search Task (PREPRINT) |
16-Feb-2009 |
25 pages |
| Authors:
J G Trafton; Melissa R Beck; Maura C Lohrenz; LOUISIANA STATE UNIV BATON ROUGE
|
 | In visual search, preattentive processes locate potential target regions and selective attention is directed to potential target locations. The current experiments examined the role of global visual clutter in participants' ability to deploy attention to target regions containing relatively more or less local clutter. Participants searched maps of high, medium, or low global clutter for a target in a high or low local clutter region. Global and local clutter influenced ... |
|
| Pilot Preferences on Vector Moving-Map Displays |
Jan-2009 |
22 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; Stephanie A Myrick; John W Ruffner; Tyrus Cohan; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Vector map databases offer the potential for customised cockpit moving-map displays, in which user-specified cartographic features can be layered to meet mission requirements. The disadvantage of vector moving-maps is the potential for increased user workload. In 1995, the Naval Research Laboratory and the Naval Air Weapons Center jointly performed a preference study, during which aircrew viewed demonstrations of prototype moving-map displays and responded to a detailed questionnaire concerning the usefulness ... |
|
| A Measure of Search Efficiency in a Real World Search Task |
Dec-2008 |
25 pages |
| Authors:
J G Trafton; Melissa R Beck; Maura C Lohrenz; LOUISIANA STATE UNIV BATON ROUGE
|
| In visual search, preattentive processes locate potential target regions and selective attention is directed to potential target locations. The current experiments examined the role of global visual clutter in participants' ability to deploy attention to target regions containing relatively more or less local clutter. Participants searched maps of high, medium, or low global clutter for a target in a high or low local clutter region. Global and local clutter influenced ... |
|
| Clearing up the Clutter |
Jan-2008 |
4 pages |
| Authors:
Melissa R Beck; Maura C Lohrenz; Michael E Trenchard; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MAPPING CHARTING AND GEODESY BRANCH
|
| Article gives a brief history of military cockpit displays, and highlight the research taking place to enhance future moving map capabilities. |
|
| Development of a Sidescan Imagery Automated Roughness Estimation Algorithm |
Mar-2006 |
9 pages |
| Authors:
Geary Layne; Maura C Lohrenz; Marlin L Gendron; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| An accurate estimation of seafloor roughness derived from sidescan imagery (SSI) is one of the components needed to determine bottom type of a geographic area for mine warfare. Analysts at the Naval Oceanographic Office (NAVOCEANO) historically have estimated roughness manually. This paper describes the development and testing of a prototype algorithm capable of deriving roughness from SSI. It also presents results from a feasibility study that showed that the algorithm ... |
|
| Feature Clustering to Measure Clutter in Electronic Displays |
Mar-2006 |
9 pages |
| Authors:
Maura C Lohrenz; Stephanie S Edwards; Marlin L Gendron; Geary J Layne; Jerome T Bradley; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| 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 (z). This paper presents preliminary results of the clustering algorithm and cluster density calculations for a series ... |
|
| Investigating Issues of Display Content vs. Clutter During Air-to-Ground Targeting Missions |
Sep-2004 |
6 pages |
| Authors:
Maura C Lohrenz; R J Hansman; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| This paper investigates competing influences of display content and clutter on pilot performance during flight guidance and target acquisition phases of air-to-ground targeting missions. Based on interviews with F/A-18 pilots, a cognitive process model is presented to help understand how pilots use and transition between internal and external sources of information to support decision-making and aircraft control. Experiments were conducted in which subjects flew targeting missions using a flight simulator ... |
|
| Demonstration and Evaluation of Moving-Maps to Improve Lane Navigation of Amphibious Vehicles |
Sep-2003 |
20 pages |
| Authors:
Maura C Lohrenz; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| The objectives of the moving maps (MM) are to demonstrate improved precise land navigation of naval Amphibious Assault Vehicles (AAV) and Landing Craft Utility (LCU) using moving-map (MM) display and to measure navigation performance access crew workload: comparing MM with baseline navigation methods. |
|
| Cognitive Issues Related to Advanced Cockpit Displays: Supporting the Transition between Internal and External Guidance |
Jun-2003 |
113 pages |
| Authors:
Maura C Lohrenz; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| 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 targeting missions such as Forward Air Control and Close Air Support. Twelve subjects performed three sets of experiments using a flight simulator (with ... |
|
| Electronic Moving Map |
Jan-2003 |
7 pages |
| Authors:
Maura C Lohrenz; Stephanie S Edwards; Marlin L Gendron; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| The U.S. Navy has identified the need for an accurate, user-friendly navigation device to guide amphibious craft drivers. The standard navigation equipment in these craft has proven inadequate. Problems associated with the current navigation processes include, but are not limited to, low visibility, complex task management, and cramped internal space. A moving map system provides the user with an accurate and visual depiction of the operating environment. This enhances both ... |
|
| A Pilot-Centered Evaluation of Geospatial Data for Proposed Navy Helicopter Moving-Map Displays |
Jan-2002 |
7 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; Stephanie E Edwards; Chris Collins; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| 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 with respect to four map types and six graphic overlays. Participants rated each resultant display for its potential ... |
|
| Vector Map Data Compression with Wavelets |
Sep-2000 |
14 pages |
| Authors:
Maura C Lohrenz; Marlin L Gendron; Juliette W Ioup; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Wavelets and wavelet transforms can be used for vector-map data compression. The choice of wavelet, the level of decomposition, the method of thresholding, the height of the threshold, relative CPU times and file sizes, and reconstructed map appearance were investigated using the Wavelet Toolbox of MATLAB. Quantitative error measures were obtained. For two test vector-map data sets consisting of longitude and latitude points, compressions of 35 to 50 percent (1.5:1 ... |
|
| Human Factors Issues in Advanced Moving-map Systems |
Jan-2000 |
11 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; John W Ruffner; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Vector-based maps are an advanced capability of digital moving-map systems that are easily customised and can be powerful aids to aircrew information processing and decision-making. However, they may place excessive demands on an aircrew's information processing requirements, cause an increase in workload, and degrade situational awareness if the user interface is not designed properly. There is little information available about the human factors and situational awareness issues relevant to vector-based ... |
|
| Human Factors Issues in the Development of an Advanced Digital Moving Map System |
Sep-1999 |
6 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; John W Ruffner; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MAPPING SCIENCES SECTION
|
| The U.S. Navy is currently sponsoring a Tactical Aircraft Moving Map Capability (TAMMAC) program that will provide the standard cockpit digital moving map system for Naval Aviation. The TAMMAC system will be used by a variety of Navy aircraft with differing operational needs and resources and can be tailored to meet aircraft-specific operational requirements. A major design goal of the TAMMAC program is to increase mission effectiveness and situation awareness ... |
|
| Optimizing Cockpit Moving-Map Displays for Enhanced Situational Awareness |
Jan-1997 |
17 pages |
| Authors:
Maura C Lohrenz; Michael E Trenchard; Stephanie A Van Myrick; Paul Zuyle; Scott D Fechtig; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MAPPING SCIENCES SECTION
|
| The objective of this project is to establish the map data requirements for a next-generation digital moving-map system that will replace existing map systems in the AV-8B, F/A-18, UH-1N, V-22, and potentially other aircraft. A primary NAVAIR goal in specifying the new moving-map system is to enhance situational awareness and aircrew mission effectiveness, without further burdening pilot task workload. To ensure that the end-users' explicit map needs are taken into ... |
|
| Reproduction of Custom Colors for the Navy's Compressed Aeronautical Chart |
Jan-1992 |
6 pages |
| Authors:
Maura C Lohrenz; Stephanie A Myrick; Perry B Wischow; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEAN SCIENCES BRANCH
|
| This paper presents a procedure that is used to reproduce custom colors on color hardcopy. The set of custom colors is comprised of red, green, and blue (RGB) intensities, where intensity levels range from 0 (no intensity) to 255 (maximum intensity). The hardcopy device that produced the results in this paper normally transforms RGB colors into cyan, magenta, yellow, and black (CMYK). However, adding black ink during the printing process ... |
|
Reports by Author
