The Offset dimension, normally O=, can be used to offset the line feature to the left or right of the surveyed line. The initial offset can be assigned to either the first or the last points on the feature. Note that if the attribute check button P,O&W on First Only is ticked, n4ce will not look for the offset on the last point of the feature. The initial offset dimension will be used until another offset dimension has been assigned to a point. Once this happens, this new offset will be used for the next and subsequent line feature segments until the end of the line feature or until another offset is found.
If a line feature is offset, the surveyed points will be displayed where they were recorded. It is the display of the line feature that will be offset. If the dimension is negative, the line will be offset to the left. You can use this in conjunction with the parallel line dimension to create asymmetrically spaced lines.
Negative Offset Feature
Offset Feature with Parallel
In the examples above, the first point on the feature is to the left. The first example shows a feature with a positive offset value. The second shows a feature with a negative offset value. The third shows a feature with a negative offset value and a positive parallel value, with code prefix. The above examples show how an offset line is created with a constant offset from the surveyed positions.
You could consider an offset feature to be a parallel feature where the surveyed feature is not drawn as a line. Therefore, if the offset varies, the new points are calculated as perpendicularly offset from the surveyed line segments unless the POW Variable check button is checked. However, the FP= dimension has no effect.