Split Sorties

Use the Split Lines option (geogxnet.dll(Geosoft.GX.UAVSurvey.SplitSorties;Run)*) from the menu UAV Merge Sorties > Merge Sortie without a Plan to split continuous UAV flights into survey and tie lines and save them to individual sortie databases (see the Application Notes section for more details). Survey Parameters must be defined before running this option.

Split Lines dialog options

Input sortie databases

The externally-planned Sorties are imported (as continuous flight lines) into individual Geosoft database files (GDB). From the drop-down list, select one Sortie database at a time, or use the Browse [...] button to navigate and select one or more files from the same directory (<CTRL>-click or <SHIFT>-click to select multiple files). The database file names will be separated by "|".

Script Parameter: UAV_SPLIT_SORTIES.DATABASES

Output sortie database prefix

Each input sortie database will be split into multiple survey and/or tie lines. Specify a prefix to add to the name of the input database. The output GDB files will have the same base name as the input GDB files prepended by the provided prefix.

Script Parameter: UAV_SPLIT_SORTIES.OUTPUT_PREFIX

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All subsequent parameters have default (preset) settings. Should you wish to customize them, expand this section.

Maximum angular change

Split the line if the angular change in direction exceeds this value over a specified distance (next parameter). The angular change is a positive value limited to ≤45°, beyond which line segments will be deviating too much from a straight line.

The default is 20.

Script Parameters: UAV_SPLIT_SORTIES.MAX_ANGULAR_CHANGE

Over a distance of

Specify over what distance, in ground units, the maximum angular change must occur or be exceeded for the line to be split. It is recommended to set this distance to half the average line spacing.

Set to flight line spacing * 0.5 by default.

Script Parameters: UAV_SPLIT_SORTIES.OVER_A_DISTANCE_OF

Minimum line length

If the conditions above will split the line into segments shorter than this length, the line is not split. This is to avoid a multitude of short segments approaching a big turn-around loop.

Set to flight line spacing * 1.1 by default.

Script Parameters: UAV_SPLIT_SORTIES.MIN_LINE_LENGTH

Lines to break

Select the line(s) to break. The options are: Selected lines and All lines.

Script Parameters: UAV_SPLIT_SORTIES.LINES_TO_BREAK [- "A" : All lines, "S": Selected lines (default)]

Application Notes

Generally, a Sortie is flown as a continuous flight, starting and ending at the takeoff point. The travel to/from the takeoff point and the turnarounds are eliminated, and the data is split into parallel lines and/or tie lines in order to be able to merge them with the data of the adjacent sorties.

Line Type and Syntax

The new (split) lines are named by using the survey geometry defined in Survey Parameters, in which line direction, spacing, origin, first line number and increment are specified. The origin will be used as a reference point, and all lines will be named using the distance/spacing to the origin.

All lines that are in the flight line direction ±5 degrees are set to type "Line".
- All of these that match a planned line location to within 5 percent of the line spacing are selected. Those that don’t are deselected.
All lines that are perpendicular to the line direction ±5 degrees are set to type "Tie".
- All of these that match a planned tie line location to within 5 percent of the tie-line spacing are selected. Those that don't are deselected.
All other lines will be unselected.

Within the same split database, if a given survey/tie line number already exists, the same base line number is used with an incremented version number.

*The GX.NET tools are embedded in the geogxnet.dll file located in the "...\Geosoft\Desktop Applications \bin" folder. If running this GX interactively, bypassing the menu, first change the folder to point to the "bin" directory, then supply the GX.NET tool in the specified format. See the topic Run GX for more details on running a GX.NET interactively.