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- Electronic Map Data Prototype Application
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- Software Description:
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- The EMD prototype application is being developed to allow
- the display and manipulation of the prototype EMD data
- sets. The application displays the map image layers, and allows
- the user to selectively turn on or off separate layers. The
- color and pattern used to display each layer can be modified.
- Different map areas can be displayed by panning in one of four
- directions, selecting a new center point by entering the
- latitude and longitude, or by selecting the new center point
- using the mouse. Also, the latitude and longitude of a pixel can
- be found.
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- Using the Level 1 DTED coverage for the map area, the application
- can display the elevation of a selected point, and also calculate
- point-to-point or radial lines of sight.
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- The application included here is an early version. The final
- application will include other features, and some of the
- existing feature may be modified.
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- System Requirements:
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- The program requires an IBM PC or compatable with a hard disk,
- 640K of memory, an EGA or VGA display, and a Logitech or
- Microsoft mouse with the driver software installed.
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- Data Description:
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- Electronic Map Data (EMD) is a digital raster map database
- designed to minimize storage requirements, support color
- normalization across sheets, and allow selective decluttering.
- EMD, rather than utilizing finished map sheets as the basic data
- source, is derived from the hardcopy color separates (layers)
- which are used in the printing process for finished map
- sheets. The scanned image of each layer is stored one bit
- deep (i.e. as one 0/1 bit per pixel). EMD facilitates
- additional storage savings by allowing for the use of a
- run-length encoding compression scheme in the storage of
- image files. While not offering a total decluttering
- capability by feature class, EMD, because of its derivation
- from color separates, does offer some decluttering. The
- types of maps/charts from which EMD may be derived include,
- but are not limited to, Global Navigation Charts, Jet
- Navigation Charts, Operational Navigation Charts, Tactical
- Pilotage Charts, Joint Operations Graphics-Air, Joint
- Operations Graphics-Combined, Joint Operation
- Graphics-Ground, Joint Operations Graphics-Radar, Series 200
- Air Target Charts, and Topological Line Maps.
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- Included with this demonstration are the images for the
- entire map area of TLM L5520, Schotten, Germany. The
- approximate area covered is from 50 24 N, 9 00 E to 50 36 N,
- 9 20 E. The map separates were scanned at 250 dots per inch
- using a Tangent scanner.
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- Also included is the level 1 DTED data for the area covered.
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- Points of Contact:
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- The following individuals may be contacted for more
- information about the data or application software.
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- Barbara Rose
- U.S. Army Engineer Topographic Laboratories
- Ft. Belvoir, Va. 22060-5546
- (703) 355-3029
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- Stuart Dogger
- Science Applications International Corporation (SAIC)
- 1710 Goodridge Drive
- McLean, Va. 22102
- (703) 556-7104
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- John Turner
- Spatial Data Sciences, Inc.
- 8200 Greensboro Drive,
- McLean, Va 22102
- (703) 893-0183
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