NEAR 3D compared to NEAR results

Question

Original User: mpugh

I am not getting the results i expect in near3d. I have 3d point data representing trees(1600 3d points) and 3d line for powerline(2 lines),
These are created from LiDAR data.
When i use NEAR    (2d) I get correct results( 2d distances) .The same data using Near 3d is not correct 
map1 = results near correct near fid in point data red  near line fid=1  ,  green near fid=2

map2  The trees that are now green and red in map 1 are incorrect and calculating distances and z values to line fid=2.

Also the red and green trees that are same in both maps give correct results for NEAR_DIST AND NEAR_DIST3 AND Z VZLUES.

No trees are >50m from any line, but using near 3d have distances up to 280m (in both NEAR_DIST and NEAR_DIST3.
I leave the search radius empty in the near3d tool.

Could this be a bug in NEAR 3D or am i using the tool incorrectly.
Malcolm Pugh

near_3d.jpg

near_2d.jpg

Jill_Saligoe-Simmel_8-1621336464704.png

NealKittelson_0-1750871510516.png

BenLeslie1 · Answer

I notice this bug is still unresolved 3.5 years on - NIM092999: The Near 3D tool outputs inconsistent results when c..

This seems quite a long time - do I need to recalibrate my expectations?

Is there an alternative method for calculating nearest distance/angle? - I really only need it for 2D features but I have Intermediate licence with Spatial Analyst so Near 3D is what's available.

I actually get mostly good results but there seems to be some errors and I'm not sure if the fault is the tool or my understanding.

Anonymous User · Answer

Original User: ggeerraallddiinnee

Hi Malcolm,

Yes there is a bug related to Near 3D:  NIM092999 - The Near 3D tool outputs inconsistent results when calculating near distances. 
It was found in 10.1 SP1.