I am trying to import an geo located .las file (52.5 gb) that was created and exported from a Leica scanner. The scan and my TBC project are in CA 6 State plane coordinates. Once the import is complete, all I can see is the point cloud point lable. No point cloud. I’ve tried different settings in the import dialog box, but no pt. cloud, or, the pt. cloud comes in hundreds of miles away.
Any help would be greatly appreciated.
Thanks,Greg
Greg
As per our conversation this afternoon, I would do the following
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Ask your project partner to screen grab the steps of the export process from their software that you / we can review to see a) the units that they are selecting and b) the coordinate system that they are selecting as they output data for you - often I hear the same thing oh its in USFT and State Plane blah blah but when we get down to it it is in metric and UTM or something like that - we have seen this from Leica users and also Propeller users - this helps to troubleshoot
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Ask them to provide either a small area of the project of a recognizable feature - eg a Cul de sac or a T Intersection or a House or something, or a very down sampled data set of e.g. 1million points over the whole site as a test data set - this will import fast and allow you to troubleshoot the right project setup quicker than you will be able to do this with a 60GB file that will take ages to import etc.
AutoCAD may have an ability to read internal file header information that allows it to better determine units and coordinate system information and convert the data on import to its current coordinate system - however if that is the case, you should be able to export exactly what you want from AutoCAD / Civil 3D in a LAS file, so that you know the settings exactly and that will then help you in TBC when you try to bring it in.
Hopefully these will help you, I will try and dig out the video I did for someone else with similar issues a while back.
You can also try the following
- Import the LAS file as Unknown - this will bring in the data like a raw file and allow you to see the N and E values of the points in the LAS file. This does not try to apply scale factors to mash up data and it uses no coordinate system. That way you can check if the coords match up to the project coordinates that you know and understand or not - if not then you can determine if they are a units issue (Meters to US Survey Foot) or a scale error or simply shifts. Once you know this, that will give you a pointer as to what the coordinate system of the LAS data should be - is it UTM or State Plane or … and allows you to work through it all until you get the data to mash up correctly.
I can look at the small LAS file for you if and when you get that to try and help out as needed - 60 GB is a lot of time to troubleshoot data.
Alan