2. Geographic Information Systems Patty McGray University of Phoenix EDTC 560 Applications of Multimedia and Web Page Design Janet Wright November 17, 2004

3. What is a GIS? An integration of five components

4. GIS functions Query Analyze Store Display Capture Output Buildings Streets Reality Customers

5. Capturing data GIS Data GPS 480585.5, 3769234.6 483194.1, 3768432.3 485285.8, 3768391.2 484327.4, 3768565.9 483874.7, 3769823.0 480585.5, 3769234.6 483194.1, 3768432.3 485285.8, 3768391.2 484327.4, 3768565.9 483874.7, 3769823.0 Coordinates Hardcopy maps Digital data

6. Storing vector data Real-world entities are abstracted into three basic shapes Points Retail stores Lines Streets Areas/Polygons Land uses

7. Storing raster data Use square cells to model reality Each square holds a value e.g. Photographs, TV Reality (A highway) X,Y Rows Columns

8. Query Identifying specific features Identifying features based on conditions Florida counties with a population greater than 300,000

9. Analysis Which parcels are within 50 feet of the road? Well type Drilled Building owner Smith Soil type Sandy Well type Drilled Building owner Smith Soil type Sandy Proximity Overlay Network

10. Display Maps Graphs Reports

11. Output Document Internet Paper map GIS Data Image

12. Organizing spatial data A GIS works with thematic layers of spatial data Answer questions by comparing different layers of data

13. Components of data Three general components to geographic information Attributes Geometry Streets Behavior Streets and highways may not intersect Rules: Road name Road type

14. Using your data The relative position of features determines relationships I-80 connects San Francisco and New York San Francisco is contained by California I-80 has length and direction New York is adjacent to the Atlantic Ocean