1 Channel Lookup
Use the Database Tools > Database Utilities > 1 Channel Lookup menu option or the Tie Line levelling > Levelling Utilities > Table Lookup menu option, (LOOKUP1 GX), to scan values from a Geosoft table based on a single reference channel.
1 Channel Lookup dialog options
Application Notes
Note that the ‘/=’ lines at the top of the lookup table are necessary as they are part of the Geosoft Table format. You cannot have more than the exact number of columns in a lookup table since each field defined by ‘/=’ is related to each column in sequential order. See below for a description of each mode.
Interpolation methods:
"exact" |
Finds exact table matches only. Values that do not match are set to dummy. |
"nearest" |
The result is set to the nearest value. |
"interpolate" |
The result is interpolated between table values. |
"nearest close" |
The result is set to the nearest value, but only if the reference value is within the nominal reference channel spacing. Other values are set to dummy. |
"interpolate close" |
The result is interpolated between lookup values, but only if the reference value is within the nominal reference channel spacing. Other values are set to dummy. |
Search Mode
Use "linear" if the reference channel data is ordered, either up or down. For ordered data, a linear search will be up to four times faster than a binary search.
Use "binary" if the reference channel data is randomly ordered. A "Binary" search can be very much faster than a linear search when the data is randomly sorted.
See Also:
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