Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 119)

DTM Stakeout
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C.L. checkbox and then tapping the &HQWHUOLQH button will open
the Select Line screen where you can select an existing polyline or
alignment that defines a centerline. This information will also be
displayed graphically in the DTM Shot screen.
5. When the Generate TIN w\Staked Points box is checked, a TIN will
be generated from the points that have been staked. This is
necessary if you want to view the surface from the points staked
in the 3D View screen. This must also be checked if you want to
get live cut / fill and volume values for the points staked. When
unchecked, the 3D View is unavailable, no volumes will be
computed, and cut / fill values cannot be viewed, but are still
stored to the raw data file.
When you check the Generate TIN w\Staked Points
box, the Setup DTM 3D screen will automatically
open, which is primarily used to set up your layers
and a boundary.