# lasfiltersurfacepoints

0th

Percentile

##### Filter the surface points

This function is superseded by the algorithm highest usable in lasfilterdecimate

##### Usage
lasfiltersurfacepoints(las, res)
##### Arguments
las

An object of class LAS or LAScatalog.

res

numeric. The resolution of the grid used to filter the point cloud

##### Value

If the input is a LAS object, returns a LAS object. If the input is a LAScatalog, returns a LAScatalog.

##### Supported processing options

Supported processing options for a LAScatalog (in bold). For more details see the LAScatalog engine documentation:

• chunk size: How much data is loaded at once.

• chunk buffer: This function guarantee a strict wall-to-wall continuous output. The buffer option is not considered.

• chunk alignment: Align the processed chunks.

• cores: How many cores are used. More cores means more data is loaded at once.

• progress: Displays a progression estimation.

• output_files*: Mandatory because the output is likely to be too big to be returned in R and needs to be written in las/laz files. Supported templates are XLEFT, XRIGHT, YBOTTOM, YTOP, XCENTER, YCENTER ID and, if chunk is size equal to 0 (processing by file), ORIGINALFILENAME.

• laz_compression: write las or laz files

• select: The function will write files equivalent to the original ones. Thus select = "*" and cannot be changed.

• filter: Read only points of interest.

Other lasfilters: lasfilterduplicates, lasfilters, lasfilter

##### Aliases
• lasfiltersurfacepoints
##### Examples
# NOT RUN {
LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")