engine_options function

Get or set LAScatalog processing engine options

The names of the options and their roles are documented in LAScatalog . The options are used by all the functions that support a LAScatalog as input. Most options are easy to understand and to link to the documentation of LAScatalog but some need more details. See section 'Details'.

opt_chunk_buffer(ctg)

opt_chunk_buffer(ctg) <- value

opt_chunk_size(ctg)

opt_chunk_size(ctg) <- value

opt_chunk_alignment(ctg)

opt_chunk_alignment(ctg) <- value

opt_restart(ctg) <- value

opt_progress(ctg)

opt_progress(ctg) <- value

opt_stop_early(ctg)

opt_stop_early(ctg) <- value

opt_wall_to_wall(ctg)

opt_wall_to_wall(ctg) <- value

opt_independent_files(ctg)

opt_independent_files(ctg) <- value

opt_output_files(ctg)

opt_output_files(ctg) <- value

opt_laz_compression(ctg)

opt_laz_compression(ctg) <- value

opt_merge(ctg)

opt_merge(ctg) <- value

opt_select(ctg)

opt_select(ctg) <- value

opt_filter(ctg)

opt_filter(ctg) <- value

Arguments

• ctg: An object of class LAScatalog
• value: An appropriate value depending on the expected input.

Details

• opt_restart() automatically sets the chunk option named "drop" in such a way that the engine will restart at a given chunk and skip all previous chunks. Useful for restarting after a crash.
• opt_independent_file() automatically sets the chunk size, chunk buffer and wall-to-wall options to process files that are not spatially related to each other, such as plot inventories.
• opt_laz_compression() automatically modifies the drivers to write LAZ files instead of LAS files.

Examples

LASfile <- system.file("extdata", "Megaplot.laz", package="lidR")
ctg = readLAScatalog(LASfile)

plot(ctg, chunk_pattern = TRUE)

opt_chunk_size(ctg) <- 150
plot(ctg, chunk_pattern = TRUE)

opt_chunk_buffer(ctg) <- 10
plot(ctg, chunk_pattern = TRUE)

opt_chunk_alignment(ctg) <- c(270,250)
plot(ctg, chunk_pattern = TRUE)

summary(ctg)

opt_output_files(ctg) <- "/path/to/folder/templated_filename_{XBOTTOM}_{ID}"
summary(ctg)

See Also

Other LAScatalog processing engine: engine