Leica Geosystems RoadRunner, Technical Reference Manual, Page: 290 / 342

290 RoadRunner Understanding the Geometry
12.3 Extension of Stringlines
Description Whenever stringlines need to be extended, for example, at the start and end area of an align-
ment or slope. The projection of the stringline is made using the tangent of the start/end point
of the stringline.
In this case a warning appears informing that the original design is exceeded. As soon as a
measured position is within the design area once again, RoadRunner will notify you.
Concept When expanding the centreline the geometry of the last element of the centreline will be
continued (for example: a centreline that ends with an arc will be continued with an arc of the
same radius).
The chosen setting for the expansion stays active whilst the task is active.
Method Description
When staking-out in the region of the start/end area of the design centreline, situations occur
where an expansion of the centreline is useful. As soon as dropping outside the defined
centreline RoadRunner will prompt if and with which method the centreline should be
expanded.
a) Centreline
b) Extended centreline
b
a
RR12_090