Quick Answer
To compensate for shadow distortion on uneven ground, use a shadow stick in a position that allows for minimal perspective distortion, such as near the ground or at a 45-degree angle. This can be achieved by adjusting the angle of the stick or using a different reference point.
Choosing the Right Stick
When selecting a stick for creating a shadow stick, choose one that is straight and at least 1.5 times the height of the observer. A longer stick allows for a more accurate reading, but may not be feasible in all environments. Look for sticks with minimal tapering or knots to minimize distortion.
Positioning the Shadow Stick
Position the stick near the ground to minimize perspective distortion. If the ground is too uneven, use a 45-degree angle to create a more accurate shadow. This can be achieved by digging a shallow trench or using a rock as a base. Place the stick in this position and take note of the shadow’s direction.
Measuring with the Shadow Stick
To measure with the shadow stick, use a standard unit of measurement such as inches or meters. Mark a point on the ground where the shadow ends and measure the distance from the shadow to the stick. Multiply this distance by the ratio of the stick’s height to the unit of measurement to determine the distance to the point.
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