Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 54)

User’s Manual
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Layers
Survey Pro uses layers to help manage the data in a job. Any number
of layers can exist in a job and any new objects can be assigned to any
particular layer. For example, a common set of points can be stored
on one layer and another set can be stored on a different layer.
The visibility of any layer can be toggled on and off, which gives full
control over the data that is displayed in a map view. This is useful to
reduce clutter in a job that contains several objects. The objects that
are stored on a layer include points, polylines, and alignments.
TDS ForeSight can read a JOB file and output an AutoCAD DXF file
containing all the original layer information. This conversion can also
be performed using TDS Survey Link 7.2, or later via the Survey
Attribute Manager, which is included as part of that program.
Layer 0
Layers can be added, deleted and renamed with the exception of Layer
0. Layer 0 is a special layer that must exist in every job. It cannot be
deleted or renamed.
Layer 0 provides two main functions: compatibility with AutoCAD;
and is used as a layer for the storage of objects that are not assigned
to any other layer. Since all the objects in a job have to be assigned to
a layer, Layer 0 is always there so a situation cannot occur where an
object is stored, but does not exist on any layer.
Other Special Layers
Some layers are automatically created, but unlike Layer 0, these
layers behave exactly the same as any user-created layer; they can be
renamed or deleted. For example, whenever control points are
imported, a Control layer is automatically created and the points in
the control file are stored to that layer. (Any non-point objects in a
control file are always ignored.)