topic Re: laz to rcp coordinate system problem in ReCap Forum

laz to rcp coordinate system problem

sanetdikkumbura1950 — Fri, 28 Apr 2023 19:42:13 GMT

I downloaded point cloud .laz data from USGS. The coordinate system of my drawing is NAD83 Georgia State Planes, West Zone, US Foot. The scale has changed when exported by recap. What is the reason for this?

@Pointdump

Re: laz to rcp coordinate system problem

ramesh_sridharan — Fri, 28 Apr 2023 22:23:43 GMT

@sanetdikkumbura1950 Seems to import fine for me.

Re: laz to rcp coordinate system problem

ramesh_sridharan — Fri, 28 Apr 2023 22:26:31 GMT

Create RCP with proper source and destn CS (both can be same), insert RCP into C3D, do not check "Use geographic location" or "Specify on Screen"

Re: laz to rcp coordinate system problem

sanetdikkumbura1950 — Fri, 28 Apr 2023 23:42:57 GMT

@ramesh_sridharan
Did you import the RCP file that I am uploading here into civil3d without any problems?

Re: laz to rcp coordinate system problem

ramesh_sridharan — Fri, 28 Apr 2023 23:56:25 GMT

You uploaded only RCP, not rcs, so I created one from your laz. Here is the one I created

Re: laz to rcp coordinate system problem

sanetdikkumbura1950 — Sat, 29 Apr 2023 00:12:37 GMT

@ramesh_sridharan

What are these settings?

Re: laz to rcp coordinate system problem

ramesh_sridharan — Sat, 29 Apr 2023 00:13:44 GMT

option to specify the coordinate system of the data you are importing.

Re: laz to rcp coordinate system problem

sanetdikkumbura1950 — Sat, 29 Apr 2023 00:30:24 GMT

@ramesh_sridharan
Not clear. please can you send me a screenshot of those settings?

Re: laz to rcp coordinate system problem

sanetdikkumbura1950 — Sat, 29 Apr 2023 00:34:35 GMT

ok. i got that. Thanks

Re: laz to rcp coordinate system problem

Pointdump — Sat, 29 Apr 2023 06:39:50 GMT

Hi Sanet,
In addition to excellent advice from @ramesh_sridharan, the LiDAR data you chose had no ground points. If your intent is a surface in Civil 3D you will want to find other data.

histogram of classification of points:
1641 unclassified (1)
447 low vegetation (3)
11873 medium vegetation (4)
97957 high vegetation (5)
6 noise (7)
2383 water (9)
13 Reserved for ASPRS Definition (21)

Dave