INTRO TO SPATIAL DATA ANALYSIS JOU-1526 Computer Assisted Reporting.
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Transcript of INTRO TO SPATIAL DATA ANALYSIS JOU-1526 Computer Assisted Reporting.
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INTRO TO SPATIAL DATA ANALYSIS
JOU-1526 Computer Assisted Reporting
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Content
Modeling our World Modeling our World with GIS Spatial Questions vs. Attribute Questions Results Terms to Know
Coordinate Reference System (CRS) Geographic Coordinates Projection
Shapefile Layer
QGIS 1.8 LisboaJOU-1526 Computer Assisted Reporting
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Modeling our World
JOU-1526 Computer Assisted Reporting
We describe any element of our world in 2 ways:
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Modeling our World with GIS
JOU-1526 Computer Assisted Reporting
A Geographic Information System (GIS) links location data and attribute data
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Spatial Questions vs. Attribute Questions
JOU-1526 Computer Assisted Reporting
In a GIS data can be queried spatially or by attributes:
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Results
JOU-1526 Computer Assisted Reporting
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Terms to Know
JOU-1526 Computer Assisted Reporting
Coordinate Reference System (CRS) Geographic Coordinates Projection
Shapefile Layer
![Page 8: INTRO TO SPATIAL DATA ANALYSIS JOU-1526 Computer Assisted Reporting.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697bfa71a28abf838c990a7/html5/thumbnails/8.jpg)
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Terms to Know – Coordinate Reference System
Geographic Coordinates 0° (Degree) Latitude Equator 0° (Degree) Longitude Greenwich (GB) Ottawa: 45°N, 75°W
JOU-1526 Computer Assisted Reporting
NEVER MEASURE IN DEGREES!!
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Terms to Know – Coordinate Reference System
Map Projections Method to represent
the surface of a sphere(3D) on a plane (2D)
Coordinates are now in measurement units like meters, km, feet, miles,… JOU-1526 Computer Assisted Reporting
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JOU-1526 Computer Assisted Reporting
Terms to Know – Coordinate Reference System
Projected [m] Unprojected [degrees]
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JOU-1526 Computer Assisted Reporting
Projections always distort surfaces!
Different projections based on location and purpose of map
Terms to Know – Coordinate Reference System
• Shape• Area• Direction• Size
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Terms to Know - Shapefile
JOU-1526 Computer Assisted Reporting
File containing information about the shape of objects, their attributes and locationsShape
Polygon
Line
Point
Location
Geographic Coordinates in Latitude / Longitude
Projected Coordinates in Measurement Units
Address
Attributes
Any kind of detail about the feature: height, length, name, color, etc.
File_Name.shp
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Terms to Know - Layer
JOU-1526 Computer Assisted Reporting
Represent the World as Layers of Information or Themes
Layers are saved as Shapefiles
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QGIS 1.8 Lisboa
JOU-1526 Computer Assisted Reporting
TOC = Table Of Contents
Shapefiles and Tables show here as so called “Layers”.
Main Window or Canvas
Data display area.
Coordinates and ScaleCoordinate Reference
System (CRS)
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References
JOU-1526 Computer Assisted Reporting
Map Projections: http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html
http://www.electoralgeography.com/new/en/countries/c/canada/canada-legislative-election-2011.html
http://datajournalism.stanford.edu/ http://votecompass.ca/