[Qgis-user] LiDAR Data in QGIS

[Nick Cummins]

The section in the link you provided refers to using LASTools in QGIS; raw LiDAR point cloud data is commonly stored in .las (or .laz) format, which can contain the additional properties described.



Just FYI, "ground hits" are usually referred to as the DTM (Digital Terrain Model). DSM (non-ground) + DTM (ground) = DEM (all points). But DTMs/DSMs/DEMs derived from processing of LiDAR point clouds are generally in some grid format, which in your case is the ESRI ArcInfo Grid (binary).



I am not very familiar with the ArcInfo Grid (.adf) format so I can't say for certain what it contains or doesn't, but it looks like there is a value attribute table (VAT), though I am doubtful it contains all the info you would get from the source .las file (and therefore you wouldn't be able to convert it in the way you're suggesting). Was there a particular attribute you were hoping to use in visualization? In the meantime, it wouldn't hurt to request for the original format if feasible.




On Dec 08, 2017, at 09:19 AM, Tyler Veinot <tylerkveinot at gmail.com> wrote:


Hello;
I need some education on LiDAR data, we currently have datasets in an Esri format that seems to be a collection of ADF files. These files consist of ground hits (DEM) and surface hits (DSM). When I bring them into QGIS I get raster symbology options but when I read this link
https://rstudio-pubs-static.s3.amazonaws.com/230154_30a0bbf22e2a49ecbfa1b72b2c7a8f96.html

It talks about various other values that should be stored to help process and visualize the data but I do not see any of those values in our data. I am not sure if I am doing something wrong or if the data has been stripped down to only represent elevations. Is there anyway these file formats can be converted to something the SAGA and Grass tolls can use or do I need to track down the raw data from the original source?
Thanks;
Tyler
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