Reliefs can be scaled similar to other EnRoute objects by clicking and dragging one of the corner selection boxes or by using the Scale tool.
When scaling reliefs it is important to consider that the relief resolution is also scaled. If a relief is created with a resolution of 100 dpi and then scaled to be ten times larger, the relief now has a resolution of 10 dpi. The image below illustrates this concept. On the left is the original relief and on the right is the scaled relief which has decreased resolution along the scaled axis.
Fit Relief to Plate
Automatically scale the relief in the Z dimension of the plate definition.