Earth Imaging Glossary
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" U "
UNDERSHOOT
An arc that does not intersect another arc. See dangling arc.
UNEP--United Nations Environment Programme
UNEP was established as a result of the United Nations Conference on the Human
Environment convened in Stockholm in 1972, UNEP is dedicated to providing leadership
and encouraging partnership in caring for the environment by inspiring, informing and
enabling nations and peoples to improve their quality of life without compromising that of
future generations.
UNESCO--United Nations Educational, Scientific and Cultural Organization
The UNESCO is based out of Paris, France. UNESCO adopts standard-setting instruments
(conventions, recommendations, declarations) in the field of education, science, culture, and
communication. These instruments do not deal with products or processes.
Recommendations of a semi-technical nature include those copyrights, statistics, and the
compatibility of information systems.
USGS--United States Geological Survey
Established in March of 1879, the Geological Survey's primary responsibilities are:
investigating and assessing the Nation's land, water, energy, and mineral resources;
conducting research on global change; investigating natural hazards such as earthquakes,
volcanos, landslides, floods, and droughts; and conducting the National Mapping Program.
To attain these objectives, the Geological Survey prepares maps and digital and cartographic
data; collects and interprets data on energy and mineral resources; conducts nationwide
assessments of the quality, quantity, and use of the Nation's water resource; performs
fundamental and applied research in the sciences and techniques involved; and publishes and
disseminates the results of its investigations in thousands of new maps and reports each year.
For further information, contact: Public Affairs Officer, USGS
UTM--Universal Transverse Mercator Projection
UTM is a widely used map projection that employs a series of identical projections around
the world in the mid-latitude areas, each spanning six degrees of longitude and oriented to a
meridian. This projection is characterized by its conformality; that is, it preserves angular
relationships and scale plus it easily allows a rectangular grid to be superimposed on it. Many
worldwide topographic and planimetric maps at scales ranging between 1:24,000 and
1:250,000 use this projection.
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Initial content for this Glossary of terms has been graciously supplied by RADARSAT International - www.rsi.ca
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