Direction Selector

Use it to isolate the roads running roughly east–west, or to find the parcel boundaries that do not follow the prevailing survey grid.

• From Angle and To Angle define the azimuth range, measured as a north azimuth — 0° is north, 90° is east, 180° is south, 270° is west.
• Tolerance widens the range at both ends, so a range of 88° to 92° with a tolerance of 3° effectively tests 85° to 95°.
• Line direction matters. A line digitised west-to-east has an azimuth of 90°; the same line digitised east-to-west has an azimuth of 270°. If a search returns fewer features than expected, test the opposite range as well — or search both.
• Selection Mode controls how the result combines with the existing selection: Add To Selection is how a two-pass search is built: run 85°–95°, then run 265°–275° adding to the selection, and you have every roughly east–west line regardless of digitising direction.
  • New Selection (default) — replaces the current selection
  • Add To Selection — adds to it
• Use selected feature restricts the test to the features currently selected, so a large selection can be narrowed down.
• Only line layers are accepted.

1. On the KGA Toolbox tab, in the Data Management group, open the VectorIQ menu, point to Select, and click Direction Selector.
2. Set Line Layer.
3. Enter the azimuth range in From Angle and To Angle — for example, 85 to 95 for roughly east-running lines.
4. Set Tolerance.
5. Leave Selection Mode at New Selection and click Select.
6. To catch lines digitised in the opposite direction, change the range to the reciprocal bearings (265 to 275 in this example), set Selection Mode to Add To Selection, and click Select again.

Requires an active KGA Toolbox license. The tool validates the license before running.