U.S.G.S. --->U.S. Geological Survey
Ultraviolet radiation (UV) is a portion of the electromagnetic spectrum with wavelengths shorter than visible light.
An unconfined aquifer
is an Aquifer
whose upper water
surface (water table) is at atmospheric
pressure, and thus is able to
An unimodal response
is a response in which a species has a single peak abundance at an optimal value
) of an Environmental
variable and its abundance
An Unit surcharge
is a surcharge imposed for all water
use above a threshold level for excess consumption established based on average Per capita
or per-household consumption.
- universal transverse Mercatorprojection
: An universal transverse Mercator (UTM) projection is the map projection
used in many standard map series.
- Upper-bound Lifetime Cancer Risk:
: An Upper-bound Lifetime Cancer Risk
is a plausible upper limit to the true Probability
that an individual will contract cancer
over a 70 year lifetime as a result of a given hazard (such as
An Urban and Built-Up Areas
is a land use
category consisting of residential, industrial, commercial, and institutional land construction sites; public administrative sites; railroad
The Urban Fabric Analysis is a method for determining the proportions of vegetative, roofed, and paved surface Cover relative to the total urban surface in the city.
- Urban Heat Island Effect:
: An Urban Heat
Island Effect is a measurable increase in ambient
urban air temperatures resulting primarily from the replacement of vegetation with buildings, roads, and other heat-absorbing infrastructure.