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

Latitude, Longitude, and Grid Systems

Students will practice using latitude and longitude to locate places on a map and understand the concept of a global grid.

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

About This Topic

Geospatial Technologies explores the modern tools geographers use to monitor and manage our world. Students examine Global Positioning Systems (GPS), Geographic Information Systems (GIS), and remote sensing. In the Ontario curriculum, this topic bridges the gap between traditional mapping and digital literacy, showing students how satellite imagery and data layering solve complex problems like tracking wildfires or planning transit routes in cities like Toronto or Ottawa.

Understanding these technologies is crucial for students as they navigate a world where location data is ubiquitous. They learn to evaluate the ethical implications of tracking and the power of data visualization in environmental protection. Students grasp this concept faster through structured discussion and peer explanation, where they can debate the balance between technological convenience and personal privacy.

Key Questions

1. Predict the climate characteristics of a region based on its latitude.
2. Compare the utility of latitude/longitude with other grid systems for navigation.
3. Analyze how global positioning systems (GPS) rely on these coordinate systems.

Learning Objectives

• Calculate the precise latitude and longitude coordinates for a given location on a map.
• Compare the accuracy and utility of latitude and longitude with other grid systems, such as the Universal Transverse Mercator (UTM), for specific navigation tasks.
• Analyze how the principles of latitude and longitude are applied in the functioning of Global Positioning Systems (GPS) to determine location.
• Predict the general climate characteristics of a region based on its position relative to the Equator and Poles using its latitude.

Before You Start

Map Projections and Types of Maps

Why: Students need to understand how a spherical Earth is represented on flat maps to grasp the concept of a grid system overlaid on these representations.

Cardinal Directions and Compass Rose

Why: A foundational understanding of North, South, East, and West is essential before learning to plot locations using angular measurements.

Key Vocabulary

Latitude	Angular distance, measured in degrees, north or south of the Equator. Lines of latitude are called parallels.
Longitude	Angular distance, measured in degrees, east or west of the Prime Meridian. Lines of longitude are called meridians.
Equator	An imaginary line drawn around the Earth equally distant from both poles, dividing the Earth into the Northern Hemisphere and Southern Hemisphere. It is 0 degrees latitude.
Prime Meridian	The line of 0 degrees longitude, which passes through Greenwich, England. It divides the Earth into the Eastern Hemisphere and Western Hemisphere.
Cardinal Directions	The four main points of a compass: North, South, East, and West. These are fundamental for understanding movement and location on a grid.

Watch Out for These Misconceptions

Common Misconception

GPS and GIS are the same thing.

What to Teach Instead

GPS is a data collection tool (finding coordinates), while GIS is a data analysis tool (layering and visualizing information). Peer teaching activities where students explain one tool to another help clarify these distinct roles.

Common Misconception

Satellite images are just photographs.

What to Teach Instead

Remote sensing often uses infrared or other sensors to detect things the human eye cannot see, like forest health or heat islands. Hands-on modeling with different filters can help students understand that these are data-rich visualizations.

Active Learning Ideas

Inquiry Circle: GIS Urban Planner

Students work in groups to 'site' a new community center using simplified data layers (population density, bus routes, green space). They must justify their choice by explaining how overlapping these data sets revealed the best location.

50 min·Small Groups

Formal Debate: The Ethics of Tracking

Divide the class into two sides to debate the use of constant GPS tracking in smartphones. One side argues for the benefits (safety, navigation, emergency response) while the other focuses on privacy and data ownership concerns.

40 min·Whole Class

Think-Pair-Share: Satellite Time-Lapse

Show satellite imagery of the same location over 20 years (e.g., the shrinking Aral Sea or urban sprawl in the GTA). Students identify three major changes, discuss the causes with a partner, and share their findings with the class.

25 min·Pairs

Real-World Connections

• Pilots and air traffic controllers use latitude and longitude coordinates to plot flight paths and ensure safe separation between aircraft, especially for long-haul international flights.
• Search and rescue teams rely on precise latitude and longitude readings from GPS devices to locate individuals in remote or challenging environments, such as hikers lost in national parks or vessels in distress at sea.
• Delivery drivers for companies like Amazon or Canada Post use GPS navigation systems, which are built upon latitude and longitude, to efficiently plan routes and find specific addresses in urban and rural areas.

Assessment Ideas

Quick Check

Provide students with a world map showing major cities. Ask them to identify the approximate latitude and longitude for three cities. For example: 'What is the approximate latitude and longitude of Tokyo?'

Exit Ticket

Give students a scenario: 'You are planning a trip to a location with a latitude of 45 degrees North and a longitude of 75 degrees West. Describe two climate characteristics you might expect at this location and explain why, referencing the Equator and Prime Meridian.'

Discussion Prompt

Pose the question: 'Imagine you are navigating a ship. How is using latitude and longitude different from, or similar to, using street addresses to find your way? Consider the scale and context of each system.'

Frequently Asked Questions

Do I need expensive software to teach GIS?

Not at all. Many free tools like ArcGIS Online for Schools or Google Earth Engine provide powerful, browser-based platforms. These allow students to explore layers of Canadian geographic data without needing specialized hardware or deep technical training.

How does remote sensing help with environmental issues?

Remote sensing allows scientists to monitor large-scale changes that are hard to see from the ground. In Canada, this is used to track melting permafrost in the North, monitor the health of the boreal forest, and predict flooding patterns along the St. Lawrence River.

What are the best hands-on strategies for teaching geospatial tech?

The best strategies involve problem-solving. Instead of just showing a map, give students a 'mission' where they must use layers of data to solve a problem. Collaborative mapping activities, where students contribute local data to a shared digital map, make the technology feel relevant and accessible.

Is geospatial technology part of the Ontario curriculum?

Yes, it is a key component of the 'Geographic Inquiry and Skill Development' strand. Students are expected to use various technologies to help them investigate geographic issues and communicate their findings effectively.