GIS stands for Geographic Information System. It is a framework for capturing, storing, analyzing, and displaying data that has a geographic component.
What Makes GIS Different
Most data analysis tools work with rows and columns. GIS adds a spatial dimension: the ability to ask questions like "What is near this location?", "How far is it between these two points?", and "Which areas overlap?" These spatial questions require specialized tools and data formats that standard spreadsheets and databases cannot handle.
What GIS Is Used For
- Urban planning — analyzing land use, zoning, and infrastructure
- Emergency response — routing ambulances, mapping flood zones
- Environmental monitoring — tracking deforestation, water quality, wildlife habitats
- Business intelligence — site selection, delivery routing, market analysis
- Public health — mapping disease outbreaks, identifying underserved areas
- Transportation — traffic analysis, transit planning, navigation
Canada has a strong GIS tradition. Natural Resources Canada maintains national geographic databases including the National Topographic System. Every province has GIS infrastructure for land management and resource planning. Municipalities use GIS for everything from property assessment to snow plowing routes. Statistics Canada uses GIS to design census boundaries and analyze demographic data.
GIS Software
The most widely used GIS software is Esri ArcGIS (commercial) and QGIS (free and open source). Web-based tools like Mapbox, Leaflet, and Google Maps API make geographic visualization accessible to developers without specialized GIS training. For data analysis, Python libraries like GeoPandas and Shapely bring GIS capabilities to data science workflows.
Layers: The Core GIS Concept
GIS organizes data as layers — each layer represents one type of geographic feature. A city map might have separate layers for roads, buildings, parks, water bodies, and transit routes. Layers can be turned on and off, styled independently, and analyzed in combination. The power of GIS comes from overlaying multiple layers to reveal spatial relationships that would be invisible in a table.
Key Takeaways
- GIS adds a spatial dimension to data analysis
- It answers location-based questions that standard tools cannot
- Data is organized as layers that can be combined and analyzed
- Both commercial (ArcGIS) and free (QGIS) tools are widely used
Learn how locations are described mathematically in Coordinates Explained.