Map Scale, Proportion and Google earth.ppt

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Map Scale, Proportion and Google earth.ppt

Map Scale, Proportion and Google earth Alyson Dougherty NCTM Standards Make decisions about units and scales that are appropriate for problem situations involving measurement Understand and use ratios and proportions to represent quantitative relationships Develop, analyze, and explain methods for solving problems involving proportions, such as scaling and finding equivalent ratios Summary Aerial imagery was utilized through Google Earth to relate proportions to students in an Algebra 1/ Data Analysis class. Constructivist approach to understanding map scale and proportional reasoning Use of familiar surroundings and major landmarks to relate to students and engage their fascination with satellite imagery Five aerial photographs of varying map scale of the school and surrounding streets, student discussion about size and teacher scaffolding to introduce scale Football field as common measurement basis in representative fraction Conversion to a unit fraction, numerator equal to 1 Extending Map Scale to Create Proportions Ground distance was expressed as an unknown variable, x Students came up with 2 ways map scale= (image length)/(ground distance) World Imagery Challenge Series of 19 aerial photographs of famous places (Taj Mahal, Eiffel Tower) from Google Earth printed using a variety of scales. Students had to recognize location and make map scale calculations Strengths Engaging activity that builds on itself Don’t have to be in a computer lab to complete Integrates technology, making it a differentiated lesson Relates real life application to the classroom Having posters hung in a hallway addresses the preferred learning style for kinesthetic learners Application of “doing math” with high level Bloom’s objectives Weakness In hopes of including this activity in my 8th grade classroom at Bristol Central, this activity is too time consuming. I think it’d be great for a regular school year activity where a couple class periods can be spent investigating. Key to

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