Get acquisition datetime from point cloud — get

get_datetime() calculates the earliest and latest acquisition datetime from point cloud files.

Usage

get_datetime(path, full.names = FALSE, verbose = FALSE)

Arguments

path: The path to a file (.las/.laz/.copc), to a directory which contains these files, or to a virtual point cloud (.vpc) referencing these files.
full.names: Whether to return the full file path or just the file name (default)

Value

A dataframe returning filename, datetime_min datetime_max

Details

This function requires the entire point cloud to be read! Thus it takes potentially a long processing time, especially if applied on entire folders or large files. Unfortunately it is only possible to derive exact acquisition date from newer (>= LAS 1.3) point cloud data, where acquisition date is encoded as adjusted standard GPS time. Otherwise, additional information on GPSweek is necessary.

Examples

f <- system.file("extdata", package = "managelidar")
get_datetime(f)
#> 
                                                                                

                                                                                

                                                                                

                                                                                

#>                            filename        datetime_min        datetime_max
#> 1 3dm_32_547_5724_1_ni_20240327.laz 2024-03-27 08:23:06 2024-03-27 08:29:25
#> 2 3dm_32_547_5725_1_ni_20240327.laz 2024-03-27 08:25:48 2024-03-27 08:32:28
#> 3 3dm_32_548_5724_1_ni_20240327.laz 2024-03-27 08:23:05 2024-03-27 08:36:29
#> 4 3dm_32_548_5725_1_ni_20240327.laz 2024-03-27 08:29:22 2024-03-27 08:40:51