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Introduction To GIS

Introduction To GIS. with Gary Johnson. WHAT IS GIS ?. What examples did you find ?. G I S. An organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms

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Introduction To GIS

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  1. Introduction To GIS with Gary Johnson

  2. WHAT IS GIS ? What examples did you find ?

  3. G I S An organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information.

  4. G Geographic: A location somewhere on , above, or below the Earth. (Spatial data) Qualities or attributes of a geographic location. (non-Spatial data) I Information: System: Tools used to develop, query, and display geographic information. S

  5. G I S What is it ? It is a process which looks at the relationships between layers of geographic information

  6. G I S is a process which looks at the relationships of layers by asking questions questions questions: Who is within a distance of... What would happen if... When was the last time... Where is a specific location of... How far from one location to another... How many occurrences of an event are within a distance of a location.

  7. Examples of GIS questions asked Desert Game Range What is the total area of industrial minerals ? Potential Radon Hazard Where are the potential radon hazards ? Earthquake Scenario What would happen in Reno if a 7.1 earthquake happened on the Carson Valley Fault range Earthquake Event How many events happened in 1976

  8. Layers of geographicallyreferenced data

  9. An organized collection of computer hardware software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display all forms of geographically referenced information. WHAT IS A GIS ?

  10. Pseudonode ARC Node Vertex Label Danglingnode User-ID Tic Key Terms

  11. VECTOR RASTER LAYERS A layer is a theme of various features: + + Locations (points) + An x,y value Lines (arcs) A series of x,y locations (polygons) Areas A closed series of x,y locations Images (raster) TIFF DEM Grids

  12. G I S What is it ? It is a process which looks at the relationships between layers of geographic information

  13. Topology (Relationships) A mathematical procedure for explicitly defining spatial relationships Three major topological concepts: Arcs connect to each other at nodes (connectivity) Arcs that connect to surround an area define a polygon (area definition) • Arcs have direction and left and right sides • (contiguity)

  14. Y X Feature Class - Points An x,y location

  15. Y X Feature Class - Line A series of x,y locations

  16. Y X Feature Class - Area (polygons) A series of x,y locations that are closed

  17. 10 Arcs connect to each other at nodes.

  18. Arcs that connect to surround an area define a polygon

  19. Arcs have direction and left and right sides

  20. Announcements: ArcView or ArcGIS is available(somewhere around) $300.00 for each module Call E.S.R.I. 1-800-447-9778 you will need to fax your class schedule

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