Geography · Grade 7 · The Geographer's Toolkit · Term 1

Geospatial Technologies: GPS and GIS

An examination of how GPS and GIS are used to solve real-world problems, with a focus on data collection and analysis.

• Ontario Curriculum Expectations
• ON: Geographic Inquiry and Skill Development - Grade 7

About This Topic

Geospatial technologies like GPS and GIS transform how we understand and interact with the world. GPS relies on a network of satellites to pinpoint locations with centimetre accuracy, vital for navigation, fieldwork, and emergency response. GIS builds on this by layering spatial data, such as population density, land use, and environmental features, to reveal patterns and support decision-making. In Ontario's Grade 7 Geography curriculum, students explore these tools through geographic inquiry, analyzing satellite imagery for environmental changes, GIS applications in urban planning, and ethical questions around constant location tracking and data privacy.

This topic strengthens skills in data collection, visualization, and critical evaluation. Students connect abstract concepts to Canadian contexts, like monitoring boreal forest loss or planning Toronto's green spaces. They learn that geospatial data drives evidence-based solutions but raises concerns about surveillance and equity in access.

Active learning suits this topic perfectly. When students use smartphone apps to gather GPS coordinates of local features and overlay them in free GIS platforms, they grasp data analysis through direct experience. Collaborative mapping projects make ethical discussions concrete, boosting engagement and retention.

Key Questions

1. Analyze how satellite imagery has changed our understanding of environmental change.
2. Explain in what ways GIS helps urban planners make better decisions.
3. Evaluate the ethical implications of constant location tracking and data privacy.

Learning Objectives

• Analyze how satellite imagery, processed through GIS, reveals patterns of environmental change over time in Canadian landscapes.
• Explain how GIS tools support urban planners in making data-driven decisions for infrastructure development in specific Canadian cities.
• Evaluate the ethical considerations and privacy concerns associated with widespread GPS data collection and its use.
• Create a simple map using collected GPS data and publicly available GIS layers to represent a local geographic feature.
• Compare the accuracy and applications of GPS and GIS in solving real-world problems.

Before You Start

Mapping and Coordinate Systems

Why: Students need a foundational understanding of maps, grids, and basic coordinate systems to comprehend how GPS and GIS locate and display information.

Data Collection and Representation

Why: Familiarity with collecting simple data and representing it visually, such as in charts or graphs, prepares students for analyzing spatial data.

Key Vocabulary

Geospatial Technology	Technologies that work with information tied to a specific location on Earth, including GPS and GIS.
GPS (Global Positioning System)	A system using satellites to determine a precise location on Earth, commonly used for navigation and data collection.
GIS (Geographic Information System)	A system designed to capture, store, manipulate, analyze, manage, and present all types of geographically referenced data.
Satellite Imagery	Digital photographs of Earth taken from satellites, used to observe land cover, environmental changes, and human activity.
Spatial Data	Information that describes the location and shape of geographic features and the relationships among them.

Watch Out for These Misconceptions

Common Misconception

GPS works reliably everywhere, including indoors or in dense forests.

What to Teach Instead

GPS needs clear satellite signals; hands-on hunts reveal signal loss in obstructed areas, prompting students to explore alternatives like Wi-Fi positioning. Group troubleshooting builds problem-solving skills.

Common Misconception

GIS maps show objective truth without bias.

What to Teach Instead

Maps reflect data choices and scales; layering activities let students question sources and projections. Peer reviews of custom maps highlight how selections influence interpretations.

Common Misconception

Satellite imagery provides live, high-detail views of any location.

What to Teach Instead

Images have delays and resolution limits; comparison tasks with real datasets clarify revisit times and pixel scales. Student annotations expose these constraints through evidence.

Active Learning Ideas

GPS Scavenger Hunt: Mapping School Grounds

Provide students with GPS apps on school devices to locate and log coordinates for 10 features, like trees or benches, with photos. Groups compile data into a shared class map using Google My Maps. Discuss accuracy challenges encountered outdoors.

45 min·Small Groups

GIS Layering Activity: Urban Planning Challenge

Using ArcGIS Online or Google Earth Engine, pairs add layers like roads, population, and parks to a city map. They propose optimal school sites based on criteria and justify choices with data overlays. Share proposals in a gallery walk.

50 min·Pairs

Satellite Imagery Comparison: Tracking Change

In small groups, students access free Landsat images of Canadian sites, such as Alberta tar sands or BC glaciers. They compare images from different years, measure changes with tools, and hypothesize causes. Present findings with annotations.

40 min·Small Groups

Ethics Role-Play: GPS Privacy Debate

Divide class into roles: citizens, planners, police. Each group prepares arguments on GPS tracking benefits versus privacy risks, using real Canadian examples. Hold a structured debate with voting on policy recommendations.

35 min·Whole Class

Real-World Connections

• Conservation authorities in Ontario use GIS to map and monitor the health of the Great Lakes watershed, identifying areas affected by pollution or invasive species based on satellite imagery and ground-level GPS data.
• Emergency services in major Canadian cities like Vancouver utilize GPS for rapid response routing and GIS to visualize incident locations, population density, and critical infrastructure during emergencies.
• Researchers studying deforestation in Canada's boreal forests use satellite imagery analyzed in GIS to track changes over decades, informing forest management policies and conservation efforts.

Assessment Ideas

Quick Check

Present students with two scenarios: one describing a problem solved by GPS (e.g., finding a lost hiker) and another by GIS (e.g., mapping traffic patterns). Ask students to write one sentence for each scenario explaining which technology is primarily used and why.

Discussion Prompt

Pose the question: 'Imagine your school wants to create a new accessible pathway. How could GPS and GIS help plan this project effectively, and what privacy concerns might arise from mapping student movement?' Facilitate a class discussion, guiding students to consider data collection, analysis, and ethical implications.

Exit Ticket

Provide students with a blank map outline of their local community. Ask them to identify one feature they could map using GPS (e.g., a park entrance) and one type of data they could add to a GIS layer for that area (e.g., tree types). They should write one sentence explaining the benefit of mapping this feature.

Frequently Asked Questions

How does GIS support urban planning in Canada?

GIS layers data on traffic, housing, and green spaces to model scenarios, like optimizing transit in Vancouver. Grade 7 students simulate this by overlaying datasets, seeing how it informs equitable decisions. This reveals trade-offs, such as balancing density with parks, preparing them for civic engagement.

What ethical issues arise from GPS and constant tracking?

Constant location data risks privacy invasion and unequal surveillance, as seen in debates over apps sharing positions. Students evaluate through role-plays, weighing safety benefits against rights. Ontario curriculum emphasizes this critical thinking for responsible tech use.

How can active learning help students grasp GPS and GIS?

Active approaches, like GPS field hunts and GIS layering projects, turn abstract tools into tangible experiences. Students collect real data, face accuracy issues, and collaborate on maps, deepening understanding. This method outperforms lectures, as peer sharing and iterations build skills and excitement for inquiry.

How has satellite imagery changed views on environmental change in Canada?

Images track deforestation in the Amazon or ice melt in the Arctic, but locally reveal wetland loss in Ontario. Students analyze time-series data to quantify shifts, connecting to climate action. Free tools make this accessible, fostering data literacy.