Lidar data is simply 3d coordinates, usually in `las` file format. Сontent example

```
library(rgdal)
library(raster)
library(tmap)
library(tmaptools)
library(lidR)
library(RStoolbox)
las_cat <- readLAScatalog("C:/1/078-638.las")
summary(las_cat)
opt_chunk_size(las_cat) <- 500
plot(las_cat, chunk_pattern = TRUE)
las_cat
#> class       : LAScatalog (v1.2 format 1)
#> extent      : 637999, 638240.5, 6077999, 6079999 (xmin, xmax, ymin, ymax)
#> coord. ref. : NA 
#> area        : 483081.1 units²
#> points      : 3.68 million points
#> density     : 7.6 points/units²
#> density      : 5.6 pulses/units²
#> num. files  : 1

```

Is there a way to get point coordinates in a typical `data.frame` for R?
As an example we can use data from this <http://data.wvgis.wvu.edu/elevation/>.
Also, is there a way to get the angle of reflection, the number of reflections in the `data.frame` from the lidar file?