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Create a column in those points and populate it with the z values of the LiDAR derived surface. Calculate the RMSE values. … Experiment with different spatial resolution outputs with your LiDAR derived DEMs until you get the closest fit surface to the survey data. …

And if you have some Python skills you can use the laspy library. See this example for converting a directory of LAZ to LAS.

The LiDAR data will almost certainly include a LiDAR report that will detail the vertical datum of the LiDAR derived DTM z units. … LiDAR accuracy will vary based on land cover, slope, reflectance, and of course the quality of the GNSS units and LiDAR equipment. …

You are going to need to confirm the vertical datum of LiDAR data which will be spelled out in the LiDAR report (most likely NAVD88). …

You have a LiDAR derived surface model and you want to calculate the volume of water that would be behind a theoretical dam? …

Use the tool ArcToolbox-3D Analyst Tools-Raster Surface-Slope to create a slope surface from your LiDAR data. …

Because you have 42 tiles of 800,000 point you have more data than a TIN can hold-you will need to build and populate a Terrain. Using the tools available in the 3D Analyst toolbox-construct an ESRI …

Was your LiDAR data produced by a contractor? If so, you should have a report that accompanies the data that details the vertical datum of the LiDAR. … In the USA a vendor will typically produce a LiDAR dataset that reference the North American Vertical Datum of 1988. …

LiDAR times often come in GPS time or time since the GPS epoch. Here is a stack exchange link with more detail (What is a GPS epoch?) This look like GPS seconds. …

Our LiDAR vendors typically provide processed surface models, the LAS/LAZ files, and text files that include the XYZ data plus GPS week and GPS seconds. …

Since you data are text files (and not LAS files) you do not need to use LASTools. Add the text files to QGIS using the Add Delimited Text option. Use the interpolation tools in the Processing toolb …

Finally, use the LAS Dataset to Raster tool to create surfaces from your LiDAR data. See An overview of displaying LAS datasets in ArcGIS. …

There is a tool in the 3D analyst toolbox called Interpolate Shape that will do this: According to ESRI, the tool description is: The Interpolate Shape tool converts a 2D point, polyline, or p …

This code will append all of the las files to an existing las file. Be sure not to store the receiving las in the same directory as the folder of las files. Here I have taken one of my las file and re …