Dear guys,

Currently i'm writting a script to calculate the surface length and 3D length (mean that the straight line length from begin vertex to the end vertex, mean that the length which has Z value apply, in math we can calculate by function in this topic: 3D Coordinate Geometry - Distance | Brilliant Math & Science Wiki

At first i used th SurfaceLength_3d function to get surface length then i use the Intersect function which will produce the 3D_length in attribute table for 3D length but 3D length and surface length are equal for every case so i think that 3d length is the Surface length in this case

Do we have any function to get the 3D straight line length of polyline in Arcgis?

Some body know about this problem ?