rlas: public_header_block_tools – R documentation

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public_header_block_tools

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.

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),
                     ScanAngle = c(-21L, -21L, -21L),
                     UserData = c(32L, 32L, 32L),
                     PointSourceID = c(17L, 17L, 17L),
                     treeID = c(1L, 1L, 1L))

lasheader = header_create(lasdata)

rlas

Read and Write 'las' and 'laz' Binary File Formats Used for Remote Sensing Data

v1.4.0

GPL-3

Authors

Jean-Romain Roussel [aut, cre, cph], Florian De Boissieu [aut, ctb] (Enable the support of .lax file and extra byte attributes), Martin Isenburg [cph] (Is the author of the LASlib and LASzip libraries), David Auty [ctb] (Reviewed the documentation), Pierrick Marie [ctb] (Helped to compile LASlib code in R), Tiago de Conto [ctb] (Implemented the -thin_with_voxel filter method)

Initial release

2021-03-21