GIS (Geographical
Information System)
We
define GIS (geographic information
system) as structure constituted by powerful set of instruments and
technologies committed to acquires, store, ménage, transforms, analyze and
visualize georeferenced spatial data.
Georeferenced information
Every documents of event referred to
a particular portion of earth surface is an example of Georeferenced information.
Geospatial information
Every document or event that is also
represented from a cartographic point of views or by maps or aerialsatellite
image is an example of geospatial information
Explanation
Spatialor
geographic data represent real world phenomena are characterized by.
There Position in space with respect
to a reference and coordinate system
·
Non-spatial attributes ( color,
temperature, etc)
·
Mutual Spatial relations
(Topological, directional, distance relation)
The definition of gis contextually
requires the definition of its objectives and methods
GIS OBJECTIVES
Its mean the set of results pursued
at the moment of the definition and creation of the GIS itself
GIS METHODS
Its means the set of operators,
coded in an abstract form, which allows the accomplish such objectives.
GIS definition on the basedof
concept of Database
‘’ A database system in which most
of the data are spatially indexed, and upon which a set of procedure s operated
in order to answer queries about spatial entities in the database’’
Smith T.R Menon, J.L starr, And J.E Estes, 1987
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