extra_bytes_attribute_tools {rlas}

Extra Bytes Attributes Tools

Description

Functions that update a header to describe Extra Bytes Attributes according to the LAS specifications

Usage

header_add_extrabytes(header, data, name, desc)

header_add_extrabytes_manual(
  header,
  name,
  desc,
  type,
  offset = NULL,
  scale = NULL,
  max = NULL,
  min = NULL,
  NA_value = NULL
)

Arguments

header

list

data

vector. Data that must be added in the extrabytes attributes.

name

character. The name of the extrabytes attributes to add in the file.

desc

character. The description of the extrabytes attributes to add in the file.

type

integer. The data type of the extrabytes attributes (page 25 of the spec).

scale, offset

numeric. The scale and offset of the data. NULL if not relevant.

min, max

numeric or integer. The minimum and maximum value of the data. NULL if not relevant.

NA_value

numeric or integer. NA is not a valid value. At writing time it will be replaced by this value that will be considered as NA. NULL if not relevant.

See Also

Other header_tools: crs_tools, fwf_interpreter(), public_header_block_tools

Examples

data = data.frame(X = c(339002.889, 339002.983, 339002.918),
                  Y = c(5248000.515, 5248000.478, 5248000.318),
                  Z = c(975.589, 974.778, 974.471),
                  gpstime = c(269347.281418006, 269347.281428006, 269347.281438006),
                  Intensity = c(82L, 54L, 27L),
                  ReturnNumber = c(1L, 1L, 2L),
                  NumberOfReturns = c(1L, 1L, 2L),
                  ScanDirectionFlag = c(1L, 1L, 1L),
                  EdgeOfFlightline = c(1L, 0L, 0L),
                  Classification = c(1L, 1L, 1L),
                  ScanAngleRank = c(-21L, -21L, -21L),
                  UserData = c(32L, 32L, 32L),
                  PointSourceID = c(17L, 17L, 17L),
                  treeID = c(1L, 1L, 1L))

lasheader = header_create(data)
lasheader[["Variable Length Records"]]

lasheader = header_add_extrabytes(lasheader, data$treeID, "treeID", "An id for each tree")
lasheader[["Variable Length Records"]]