public_header_block_tools {rlas}

Public Header Block Tools

Description

Create or update a header for a las file from a dataset. A las file consists of two parts. A header that describes the data and the data itself. These functions make valid headers (public header block only) that can be used in write.las.

Usage

header_create(data)

header_update(header, data)

Arguments

data

data.frame or data.table

header

list. A header

Details

header_create makes a full header from data. header_update modifies the information that needs to be updated. But most of the original information is not modified, for example point data format is kept 'as is'.

Value

A list containing the metadata required to write a las file.

See Also

Other header_tools: crs_tools, extra_bytes_attribute_tools, fwf_interpreter()

Examples

lasdata = 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(lasdata)