GISgeoservis.ftn.uns.ac.rs/.../GIS.pdf · 2012. 11. 14. · Title: Microsoft PowerPoint - GIS.ppt...
Transcript of GISgeoservis.ftn.uns.ac.rs/.../GIS.pdf · 2012. 11. 14. · Title: Microsoft PowerPoint - GIS.ppt...
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GIS
Dr. V. Bulatović
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Introducing GIS
� Objectives: Understanding what GIS is
and what it can be used for.
� Keywords: GIS, Computer, Maps, Data,
Information System, Spatial, Analysis
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Introducing GIS
� Digital Data – the geographical information that you will view and analyse using computer hardware and software.
� Computer Hardware – computers used for storing data, displaying graphics and processing data.
� Computer Software – computer programs that run on the computer hardware and allow you to work with digital data. A software program that forms part of the GIS is called a GIS Application.
� People
� Procedures
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Introducing GIS
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GIS Data
� Vector data
� Raster data
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Vector data
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Data Capture
Extension Description
.shp The geometry of vector
features are stored in this file
.dbf The attributes of vector
features are stored in this file
.shx This file is an index that
helps the GIS Application to
find features more quickly.
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Raster Data
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Raster Data
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Raster Data
� Georeferencing
� Sources of raster data
� Spatial Resolution
� Spectral resolution
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Topology
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Topology
� Topology rules
� Topological tools
� Snapping distance
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Coordinate Reference Systems
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Coordinate Reference Systems
�Map projections with angular
conformity
�Map projections with equal distance
� Projections with equal areas
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Map Production
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Spatial analysis tools
Intersection: The output layer contains all areas where both layers overlap (intersect).
Union: the output layer contains all areas of the two input layers combined.
Symmetrical difference: The output layer contains all areas of the input layers except those areas where the two layers overlap (intersect).
Difference: The output layer contains all areas of the first input layer that do not overlap (intersect) with the second input layer.
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Spatial analysis tools
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Interpolation
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Interpolation