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[[image]]

With a little more calculation, you can figure out that the area covered in the picture is about 150 km x 200 km (90 miles x 135 miles). These calculations can be an excellent math lesson for your students. You can even make a scale bar for the image (you might ask a geography or math teacher to help your students do this). Here is the scale bar that we calculated for this image:

0        50        100
| | | | | | | | | | |
        MILES

Not all images need a scale bar for your analysis. However, a rough sense of scale in the image is essential. Depending on the nature of the investigation, it may be adequate simply to have a sense of the size of the region shown in the image, in correlation with a globe or map. In fact, it is difficult to make a scale bar for views that show large areas of the Earth or that extend to the horizon, because the scale might differ from one part of the image to another.

To summarize, in this "Getting Oriented" phase, you and your students find out basic information which helps get them oriented to the image, such as:

• location shown in the image
• type of picture
• date
• image reference number
• cross-reference with a map
• the larger context
• central features in the image
• which way is north
• scale and size of area shown in the image

Teachers' Guide                            Page9.15