About the Coordinate Cartography Mapper


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Pitsco Coordinate Cartography Mapper Students use a coordinate grid to plot elevation contour lines of an unknown terrain!

About the Coordinate Cartography Mapper The Coordinate Cartography Mapper utilizes the Cartesian coordinate system. The two-dimensional version of this system uses a vertical axis and a horizontal axis, usually labeled x and y. These axes intersect at the point (0,0). At right is an example of two points, Point (-1,3) and Point (4,2), mapped using the Cartesian coordinate system. The Coordinate Cartography Mapper is like the grid at right except it only uses the top-right quarter of the system. By inserting the depth probe into each point systematically and recording the measurements on a grid, you can make a pixelated map of the two landforms included inside the Mapper.

4 (-1,3)



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For an advanced exercise, research how to use the three-dimensional version of the Cartesian coordinate system. Then, plot the depth measurements at each grid point on the box using the three-dimensional coordinate system.

Getting Started You should have received the Coordinate Cartography Mapper with two landforms already placed into the Mapper – one on one side of the box and one on the other. You should also have a wire depth probe and a small O-ring. Place the O-ring on the narrow end of the probe and push it onto the probe. If anything is missing, call Customer Service at 800-358-4983. The above drawing is what the valley You will also need a pencil, a metric ruler, and a copy of the grid on the landform would look like if its measureback page of this user guide (or a piece of graph paper labeled like the ments were converted into a 3-D drawing.

grid in this guide).

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Mapping the Depths There are two sides of the Mapper: a mountain and a valley. The instructions below are for mapping one side. To map both sides, flip the Mapper over and repeat the procedure below. 1. With the O-ring near the end of the wire depth probe, push the probe into the hole for Point (0,0). Pull out the probe without moving the O-ring. 2. Using a metric ruler, measure the distance from the end of the probe to the O-ring. Record this measurement at the corresponding point on the grid. 3. Continue to repeat Steps 1-2 for each point, taking care to do this systematically. It is recommended to either work left to right or bottom to top and to complete one row before moving to the next.

Measure the points in a systematic way, such as left to right and moving up the rows as indicated by the arrows above. 2

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Creating a Pixelated Map 1. For each side mapped, determine the shallowest and deepest depths in millimeters (mm). Subtract the shallowest depth from the deepest depth – this is called the range. 2. Determine the number of colors or shades of black you wish to use. Divide the range by the number of colors or shades of black possible. For example, if the smallest and biggest depths for a grid are 5 and 55 mm, then that grid has a range of 50. 3. There are 10 shades possible in this example, so every shade covers a range of five millimeters. Assign gradually lighter shades to smaller ranges (or vice versa). Then, shade them accordingly in the grid to create a pixelated map. See the partially completed example grid* below. Use darker colors on one end of the scale and lighter colors on the other end; otherwise, the grid may not closely resemble the land mass. *The sample grid does not use data from the Coordinate Cartography Mapper.

Legend: 50-54

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Creating a Map Worksheet In the boxes on the left, color or shade the number of boxes you need with the colors or shades you have chosen. On the line beside the box, write what range that color or shade represents.

Legend: (Shade/color) (Range) _________

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© 2006 Pitsco, Inc. This page may be photocopied for use within the classroom. By honoring our copyright, you enable us to invest in research for education.