The method of calculating the height of the points on the new feature is defined by the Heights group. The fields that are displayed in the Height group will change depending upon the selected calculation method.
Same Height - will give the new points on the parallel feature the same height as that from the respective point on the reference feature.
Constant Height - will give the new points a fixed value. This will come from the Constant Height field which will be displayed when this radio button is set.
Relative Height - will give the points a height offset vertically from the respective point on the reference string. This will come from the Relative Height field which will be displayed when this radio button is set.
DTM Interpolation - will give the points heights that are interpolated from a DTM model. The model is selected from the Reference DTM combo box which will be displayed when this radio button is set.
Above DTM - will give the points heights that are a fixed offset above a DTM model. The model is selected from the Reference DTM combo box and the height offset will come from the Relative Height field. Both fields will be displayed when this radio button is set.
Slope Value - will give the points heights that are calculated from a gradient, taken from the Grade (1 in) field which will be displayed when this radio button is checked. If the slope is positive, the new point will be calculated above the reference point. A relative height is calculated using this slope and the parallel offset. For example, a slope of 1 in 1 with a parallel offset of 10m creates a height offset of 10m up. The Slope Offset check box allows you to specify that the parallel offset should be taken as a slope offset rather than a plan offset. If the Percentage check button is checked, you can specify the slope by percentage gradient.
Null height - will give the points that are calculated no height.
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