MAPS : GEOGRAPHY : DICTIONARIES: SUBJECT: GEOGRAPHICAL: United States Imagery And Geospatial Information Service (USIGS): Glossary

[David P. Dillard]

MAPS : GEOGRAPHY : DICTIONARIES: SUBJECT: GEOGRAPHICAL: United States
Imagery And Geospatial Information Service (USIGS): Glossary

United States Imagery And Geospatial Information Service (USIGS)
Glossary
Revision B
23 November 1999
<http://www.fas.org/irp/agency/nima/nug/>

PREFACE
<http://www.fas.org/irp/agency/nima/nug/nug_preface.html>

"This document was prepared by the National Imagery and Mapping Agency
(NIMA), Architecture and Requirements Office (AR). The intent of this
document is to provide a common set of definitions and acronyms for the
development and evolution of the United States Imagery and Geospatial
Information System (USIGS). The items contained in this glossary have been
collected from multiple sources which are listed in Section 1. Acronyms
and abbreviations are given in Section 2. Definitions and descriptions are
given in Section 3. In some cases the sources define the same term in
different ways. It is expected that these multiple definitions will be
addressed as this glossary evolves, but in many cases multiple definitions
of a term may ultimately remain in the USIGS Glossary as a reflection of
different uses or contexts of the term.

In addition to the many general terms contained in the USIGS Glossary,
several terms have been collected from the USIGS Conceptual Data Model
(USIGS/CDM) and asssociated logical data model (LDM) (e.g., Archive &
Dissemination Logical Data Model (A&D LDM)) data dictionaries. While the
intent of the USIGS Glossary is not to duplicate these data dictionaries
in their entireties, many of the entity-level data dictionary terms are
general enough in nature to warrant inclusion in the USIGS Glossary."


Content Sample:

Term Definition/Description Source

H and D curve See characteristic curve. HDBK-850

H.221 The ITU-T standard relating to communications protocol for video
conferencing. Multimedia

H.261 The ITU-T Px64 standard relating to the video compression algorithm.
Multimedia

hachuring (JCS) A method of representing relief upon a map or chart by
shading in short disconnected lines drawn in the direction of the slopes.
HDBK-850

hack chronometer A chronometer used for visual reference, and not usually
for record purposes. HDBK-850

halation (photography) A spreading of a photographic image beyond its
proper boundaries, due especially to reflection from the side of the film
or plate support opposite to that on which the emulsion is coated.
Particularly noticeable in photographs of bright objects against a darker
background. HDBK-850

half mark See index mark. HDBK-850

half model The stereoscopic model formed by the overlap of two adjacent
right- or left-hand exposures of convergent photographs. HDBK-850
half section Any two quarter sections within a section which have a common
boundary; usually identified as the north half, south half, east half, or
west half of a particular section. HDBK-850

half tide level See mean tide level. HDBK-850

halftone (JCS) Any photomechanical printing surface or the impression
therefrom in which detail and tone values are represented by a series of
evenly spaced dots of varying size and shape, varying in direct proportion
to the intensity of the tones they represent. See also halftone screen;
middletone. HDBK-850

hand level A hand-held instrument for approximate leveling. It consists of
a sighting tube with a split field of view; a horizontal cross hair in
one-half of the field bisects the image of a spirit level in the other
half when the instrument is held level. See also Abney level. HDBK-850

hand proof In offset lithography, a proof of a plate made on a hand proof
press where operations are manual for inking, dampening, and taking the
impression. HDBK-850

hand templet A templet made by tracing the radials from the photograph
onto a transparent plastic medium. Hand templets are laid out and adjusted
by hand to form the radial triangulation. HDBK-850

handle An index entry or unique name in software that identifies a catalog
entry or other resource so that it can be found and utilized by another
software facility. OpenGIS Guide


Sincerely,
David Dillard
Temple University
(215) 204 - 4584
jw...@astro.temple.edu
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