GPS Filter
This operator creates a position variable containing only those GPS fixes from the operand that match the user specified Fix Specification and Fix Retention settings on the GPS filter page of the Variable Properties dialog box.
Echoview accepts operands with the following data types:
- Position
For more information on the use of this operator see Processing and smoothing cruise tracks.
Settings
The GPS Filter Variable Properties dialog box pages include (common) Variable Properties pages and these operator pages:
Operands page
GPS filter page
Setting |
Description |
Fix Specification |
Enter an expression, for a filter, containing zero or more groups of GPS-fix letters.
|
Fix Retention |
This setting specifies what to do with GPS fixes in the operand that match the filter expression set in Fix Specification. You can choose to Retain matching fixes or Discard matching fixes. |
Fix Availability |
Lists the available GPS-fix letter groups in the operand. |
Fix Selection |
Lists the GPS-fix letter groups selected for the virtual variable. This list updates when OK or Apply is used. |