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Open Printable/Searchable Copy - Global Mapper

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<strong>Global</strong> <strong>Mapper</strong> User's Manual<br />

The Combine Terrain Layers Options panel (displayed above) allows the user to select the name to assign to<br />

the newly generated layer, select the layers to combine to make the new layer, select the operation to perform<br />

when combining the new layer, and select the vertical units and sample spacing of the new layer. The<br />

available operations are described below:<br />

• Addition - values from each layer are added to each other<br />

• Subtraction (Difference) - Signed - value in new layer is assigned to the difference between the<br />

value in the first layer and the value in the second layer<br />

• Subtraction (Difference) - Unsigned - value in new layer is assigned to the magnitude (absolute<br />

value) of the difference between the value in the first layer and the value in the second layer<br />

• Average Elevation - value in new layer is assigned to the average of the value in the first layer and<br />

the value in the second layer<br />

• Minimum Elevation - value in new layer is assigned to the smaller of the value in the first layer and<br />

the value in the second layer<br />

• Maximum Elevation - value in new layer is assigned to the larger of the value in the first layer and<br />

the value in the second layer<br />

• Multiply Values - value in new layer is assigned to the product of the value in the first layer and the<br />

value in the second layer<br />

Table of Contents 177

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