Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 93)

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Road Layout
Overview
The Road menu contains a powerful set of routines that allow you to
enter and modify road layout information and then stake the road in
the field. The road staking routines allow you to stake any part of the
road or slope stake the road.
There are four basic components of a road: The Horizontal Alignment;
the Vertical Alignment; Templates, and a POB. All of these
components are described separately below and each is a required
component to a complete road definition.
Horizontal Alignment (HAL)
The horizontal alignment, referred to as the HAL, defines the
horizontal features of an alignment. It can contain information on
straight, curved, and spiral sections of the alignment. Generally the
HAL coincides with the centerline of a road, but it is not required to
be the centerline. All stationing for an alignment will come from the
HAL.
Vertical Alignment (VAL)
The vertical alignment, referred to as the VAL, defines the vertical
components of the alignment including grades and parabolic vertical
curves.
The VAL is generated in the same way as the HAL. The VAL can be
the same length as the HAL, or longer, but it cannot be shorter.
Templates
Templates contain the cross section information for the road.
Templates are stored in separate files with a TP5 extension so they
can be used with multiple jobs. The templates are broken down into
sections, called segments. Each segment contains a specified length,