![](http://upload.luquay.com/wikipedia/commons/thumb/c/c3/Cross_ratio_metrology_example.svg/400px-Cross_ratio_metrology_example.svg.png)
- In (1), the width of the side street, W is computed from the known widths of the adjacent shops.
- In (2), the width of only one shop is needed because a vanishing point, V is visible.
![](http://upload.luquay.com/wikipedia/commons/thumb/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg/50px-Test_Template_Info-Icon_-_Version_%282%29.svg.png)
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