Hi,
I've create connections between most of all international airports with xy to line tools - tried all types (Geodesic, Rumbh line ... ) - its about 24000 lines. This tool creates shapefile in Geographic Coordinate System: GCS_WGS_1984. In this is case is of course impossible to calculate length of lines. So i tried to project them into WGS_1984_Web_Mercator_Auxiliary_Sphere, after that I can calculate planar lengths.
I know --- The geodesic lengths can be calculated only in projected coordinate system such as USA_Contiguous_Equidistant_Conic etc. so the lengths are correct only in area for which is concrete projection created.
