Thursday, 21 September 2017

GIS (Geographical Information System)

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

No comments:

Post a Comment

Regression Analysis

Regression Analysis Ø   Open the Regression Tutorial Arc_GIS Ø   Open Regression Exercises Ø   Open the Regression Analysis 911 Calls...