|
What is GIS?
·
Click on the image
above for a small presentation
Geographic Information System (GIS) is an information system that is
used to input, store, retrieve, manipulate,
analyze and output geographically referenced data in order to
support decision making for planning and management of land use,
natural resources, environment, transportation, urban facilities, and
other administrative records.
The sources of geospatial data are digitized maps, aerial photographs,
satellite images, statistical tables and other related documents.
Geospatial data are classified into graphic data and attributes (called
thematic layers). Thematic layers include datsets
such as: population, demographics and census data, floodplain
delineation, transportation, soils etc.
Streams
Land Use
Elevation
Facilities
Soil
|
|
Graphic
data has three elements ; point (or called
node), line (or called arc) and area (or called polygon) in either
vector or raster form which represent a geometry of topology, size,
shape, position and orientation.
|
|
