I noticed that the Create Thiessen Polygon Tool in ArcGIS 10.3 is not producing a continuous irregular tessellation across the analysis area.
The resulting polygons have gaps and overlaps as confirmed by topology! I have not noticed this on other versions of ArcGIS.
Can anyone confirm that this is happening on their installation of ArcGIS 10.3? Is there a fix, or does anyone have a script to replace Create Thiessen Polygons that works correctly?