Accuracy - the closeness of observations, computations, or estimates to the true values or to values
accepted as being true.
Aerial - Of, or pertaining to, or occuring in the air or atmopshere
algorithm - a statement of the steps to be followed in the solution of a problem; may be in the form of a
word description, an explanatory note, or a labeled diagram or flowchart.
Alluvium - any material deposited by running water; the soil material of floodplains and alluvial fans.
Altitude - elevation above or below a reference datum; the datum is usual the mean sea level.
analog - a form of data display in which values are shown in graphic form, such as curves.
aquifer - any subsurface material that holds a relatively large quantity of groundwater and is able to
transmit water readily.
area - a generic term for a bounded, continuous, two-dimensional object that may or may not include its
boundary.
aspect - the horizontal direction in which a slope faces, commonly expressed as compass direction;
degrees clockwise from the north.
attribute - a defined characteristic of an entity. (ie topographic slope)
attribute value - a specific quality or quantity assigned to an attribute (ie percentage slope)
band - a specific frequency or range of frequencies in the electromagnetic spectrum.
, baseflow - the portion of streamflow contributed by groundwater; it is a steady flow that is slow to
change even during rainless periods
berm - a low, linear mound of earth and soil.
buffer - (1) the zone around the perimeter of a wetland or lake where land-use activities are limited to
protect the water features; (2) a zone of a specified distance around any map feature in a GIS layer.
cadastre - a parcel-based land information system.
carrying capacity - the level of development density or use that an environment is able to support
without suffering undesirable or irreversible degradation.
characterization - the delineation or representation of the essential features or qualities exiting at a site.
chloropleth map - a map compromised of areas of any size or shape representing qulitiative phenomena
(ie soil fertility) or quantitative phenomena (ie elevation); often has mosaic apperance.
climate - the general or representative conditions of the atmosphere at a place on earth.
clustering - a land development concept in which buildings and infrastructures are grouped together,
and large contiguous areas of open space remain undeveloped.
coefficient of runoff - a number given to a type of ground surface representing the proportion of rainfall
converted to overland surface flow.
concentration time - the time taken for a drop of rainfall on the perimeter of a drainage basin to pass
through the basin to the outlet.
constraint - any feature or condition of the built or natural environment that poses an obstacle to
proposed land uses.
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