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If the parameters important for migration (BKGR (Background) removal,
Auto first arrival or parameters within the Migration wizard) are changed,
then all calculations to create the horizontal and vertical slices are carried
out once more. This can take from 30 sec to 3 min (depends on the data
size). The calculations carried out in each of the directions include FIR
filters, interpolation of the data and combining the two directional data sets.
BKGR Removal, Migration, and Auto first arrival also are calculated if
chosen by the user.
By selecting Migration Wizard, the Migration Wizard is reached. In this
option it is possible to select an appropriate soil velocity for the migration.
First, select a slice (X or Y) with a well-defined hyperbola. Choosing the X
or Y Slice buttons views the data before migration, and when releasing
them views the data with migration. The soil velocity may be changed, with
the Velocity option to be correctly set to give a point shape
result of the chosen hyperbola and the result of the migration with that
particular velocity can be viewed, without spending the time of migrating
the whole dataset.
In the Migration Wizard mode, the
button gives the following screen. Closing
the window returns the user to the
measured data. The options is used
if display settings need to be changed and
by
pressing the new settings of the
migration velocity is calculated for the
whole data set.
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