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GRIPS 2: Government Rast…rocessing Software & Data
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1990-06-20
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Electronic Map Data Prototype Application
Software Description:
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.
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.
The application included here is an early version. The final
application will include other features, and some of the
existing feature may be modified.
System Requirements:
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.
Data Description:
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.
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.
Also included is the level 1 DTED data for the area covered.
Points of Contact:
The following individuals may be contacted for more
information about the data or application software.
Barbara Rose
U.S. Army Engineer Topographic Laboratories
Ft. Belvoir, Va. 22060-5546
(703) 355-3029
Stuart Dogger
Science Applications International Corporation (SAIC)
1710 Goodridge Drive
McLean, Va. 22102
(703) 556-7104
John Turner
Spatial Data Sciences, Inc.
8200 Greensboro Drive,
McLean, Va 22102
(703) 893-0183