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Using geolock, Slope staking – Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual User Manual

Page 178

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User’s Manual – Conventional Mode

168

back to yellow and you will need to move around again to re-

localize before you can use the GeoLock feature.

Using GeoLock

If, for example, you have a localization solution and you pass behind a
group of trees where the total station loses lock on the prism, the

GeoLock button will become enabled. Tapping GeoLock will instruct

the total station to turn to the location of the prism based on the last

GPS reading, followed by a search until the total station is locked

back onto the prism.

Slope Staking

The ultimate purpose of the slope staking routine is to locate where
the design slopes that extend from the ends of a roadway intersect

with the actual terrain at various stations. This intersecting point is

called the catch point.

Before a road can be slope staked, it must first be designed. The first

step to designing a road is to define the path of the road’s centerline.
This line can be in the form of a polyline or an alignment. Creating

this line is explained in detail starting on Page 49.
Once the centerline is defined, the cross-sectional profile of
the road must be defined. This profile is then superimposed

onto the centerline at a specified station interval. The final

step is to go out in the field and stake the catch points at
each of these stations.
A road’s cross sectional profile always consists of left and

right road surfaces, which are tangent at the centerline. An
optional curb or ditch can also be included in the road

profile. The final segment of a road’s profile has either a

specified positive slope or a specified negative slope, which
ends at the catch point. This final segment attaches to the

edge of the road at what is called the hinge point since this
segment can hinge between a positive and negative slope

around this point.

CL

Fill Area

Hinge Points

Catch Points

Terrain

A road requiring a fill on
both sides.

CL

Cut Area

Hinge Points

Catch Points

Terrain

A road requiring a cut on
both sides.