topic Re: LAS dataset Location issue in ArcGIS Pro Questions

LAS dataset Location issue

Arun_PrasadRamanujadoss — Fri, 22 Jul 2016 04:20:36 GMT

Hi guys,

I am having a set of LAZ files downloaded from a Government website, converted them into LAS using 3D Sample tools (https://www.arcgis.com/home/item.html?id=fe221371b77940749ff96e90f2de3d10) and tried to load it into ArcGIS pro by creating a LAS Dataset. I used the UTM projection of the region(Rotterdam, Netherlands). When I am adding the Las Dataset into the Scene I am getting it near by Africa instead of Europe. I couldn't able to find out the problem, the problem is with projection I used the projection tools given in the 3D Sample tolls but nothing changed the result. When I didn't give any coordinate system the data is coming in North America.

Kindly help me to narrow down the issue and what other tools can be tested with the data?

Re: LAS dataset Location issue

AdrianWelsh — Fri, 22 Jul 2016 06:39:41 GMT

Arun,

Is it possible that something has gone wrong with the conversion from LAZ to LAS?

If your data is showing up around Africa, then it likely sounds like a projection issue (I'm guessing it's around the 0, 0 coordinate in the system you're using).

Can you reproject to a different system for that part of Europe? Do you tools allow you to reproject?

Re: LAS dataset Location issue

NeilAyres — Fri, 22 Jul 2016 11:20:41 GMT

Normally I assign the coordinate system at the lasd level, after loading the las files into it.

I have rarely met a las file that has had coordinate information already attached to it.

So, you should really go back to that Gov agency and find out what the correct coordinate system for their data actually is.

But as Adrian says, if it is pitching up off the Nigerian coast, then maybe it is in GCS (geographic) and not a projected system. That is quite unusual.

Re: LAS dataset Location issue

Arun_PrasadRamanujadoss — Mon, 25 Jul 2016 03:25:20 GMT

Hi Adrain,

Reprojecting LAS Dataset using Transformation tools is not possible. And there is no other tools that I found out for the reprojection of LAS files also.

If there is any way to reproject las files or lasd file it would make the process simple.

Re: LAS dataset Location issue

Arun_PrasadRamanujadoss — Mon, 25 Jul 2016 03:27:14 GMT

Hi Neil,

As Adrian suggested is there any chances there would be a error taken place during the process of LAZ to LAS and please recommend which tool that you use for the usual conversion of laz to las?

Re: LAS dataset Location issue

NeilAyres — Mon, 25 Jul 2016 08:14:07 GMT

I have used the really excellent LasTools tools from here :

https://rapidlasso.com/lastools/

Re: LAS dataset Location issue

ZacharyJaffe1 — Thu, 16 Aug 2018 13:06:11 GMT

Hi Arun Prasad Ramanujadoss,

I am currently having the same issue. I know my data is in a NAD83 State Plane in the US, but when I add my .las to ArcPro, it is displaying off the coast in Africa. I create an .lasd and specify the coordinate system I want, but it is still in the wrong location.

Any tips?

Thanks,

Zach

Re: LAS dataset Location issue

NeilAyres — Fri, 17 Aug 2018 08:57:26 GMT

If your data is appearing somewhere here :

Then the data is in degrees and not really in a Stateplane projection.

Check you the extents by looking at the properties of the lasd

Re: LAS dataset Location issue

ZacharyJaffe1 — Mon, 27 Aug 2018 12:11:21 GMT

It is close to there (lands somewhere in Togo). I converted my data from a .pts file in Autodesk RECAP where I know it is in a state plane projection to .las file (via LasTools). Maybe the coordinate system is lost in the data transfer?