Provided by: liblas-bin_1.8.1-10_amd64 bug

NAME

       las2txt - output ASRPS LAS files into ASCII text

SYNOPSIS

       las2txt [-h | -i <infile> -o <outfile> -t <format> | -formats]

DESCRIPTION

       las2txt allows you to output ASRPS LAS files into ASCII text.

       The  '-parse txyz' flag specifies how to format each line of the ASCII file.  For example,
       'txyzia' means that the first number of each line should be the gpstime,  the  next  three
       numbers  should be the x, y, and z coordinate, the next number should be the intensity and
       the next number should be the scan angle.

       Supported entries

       · a - scan angle

       · i - intensity

       · n - number of returns for given pulse

       · r - number of this return

       · c - classification

       · u - user data

       · p - point source ID

       · e - edge of flight line flag

       · d - direction of scan flag

       · R - red channel of RGB color

       · G - green channel of RGB color

       · B - blue channel of RGB color

       · M - vertex index number

       Separators

       The '-sep space' flag specifies what separator to use.   The  default  is  a  space.   The
       following list is valid for separator characters (case sensitive):

       · tab

       · comma

       · colon

       · hyphen

       · dot

       · semicolon

       Header Separators

       The  '-header pound' flag results in the header information being printed at the beginning
       of the ASCII file in form of a comment that starts with the special character '#'.   Other
       possible special characters include (case sensitive):

       · percent

       · dollar

       · semicolon

       · comma

       · star

       · colon

       · semicolon

OPTIONS

       las2txt options:

       -h, --help
              produce help message

       -i arg, --input arg
              input LAS file.

       -o arg, --output arg
              output  text  file.   Use  'stdout'  if  you want it written to the standard output
              stream

       --parse arg
              The '--parse txyz' flag specifies how to format each line of the ASCII file.

              For example, 'txyzia' means that the first  number  of  each  line  should  be  the
              gpstime,  the  next  three  numbers  should be the x, y, and z coordinate, the next
              number should be the intensity and the next number should be the scan angle.

              The supported entries are:

              · x - x coordinate as a double

              · y - y coordinate as a double

              · z - z coordinate as a double

              · X - x coordinate as unscaled integer

              · Y - y coordinate as unscaled integer

              · Z - z coordinate as unscaled integer

              · a - scan angle

              · i - intensity

              · n - number of returns for given pulse

              · r - number of this return

              · c - classification number

              · C - classification name

              · u - user data

              · p - point source ID

              · e - edge of flight line

              · d - direction of scan flag

              · R - red channel of RGB color

              · G - green channel of RGB color

              · B - blue channel of RGB color

              · M - vertex index number

       --precision arg
              The number of decimal places to use  for  x,y,z,[t]  output.   --precision  7  7  3
              --precision  3  3 4 6 If you don't specify any precision, las2txt uses the implicit
              values defined by the header's scale value (and a precision of 8 is  used  for  any
              time values.)

       --delimiter arg
              The  character  to  use  for  delimiting  fields  in  the  output.  --delimiter ","
              --delimiter "" --delimiter " "

       --labels
              Print row of header labels

       --header
              Print header information

       -v, --verbose
              Verbose message output

       --xml  Output as XML.  No formatting given by --parse is respected in this case.

       --stdout
              Output data to stdout

       Filtering options:

       -e arg, --extent arg
              Extent window that points must fall within  to  keep.   Use  a  comma-separated  or
              quoted,  space-separated  list,  for example, -e minx, miny, maxx, maxy or -e minx,
              miny, minz, maxx, maxy, maxz -e "minx miny minz maxx maxy maxz"

       --minx arg
              Extent must be greater than or equal to minx to be kept.  --minx 1234.0

       --miny arg
              Extent must be greater than or equal to miny to be kept.  --miny 5678.0

       --minz arg
              Extent must be greater than or equal to minz to be kept.  If maxx and maxy are  set
              but not minz *and maxz, all z values are kept.  --minz 0.0

       --maxx arg
              Extent must be less than or equal to maxx to be kept.  --maxx 1234.0

       --maxy arg
              Extent must be less than or equal to maxy to be kept.  --maxy 5678.0

       --maxz arg
              Extent must be less than or equal to maxz to be kept.  If maxx and maxy are set but
              not maxz *and minz, all z values are kept.  --maxz 10.0

       -t arg, --thin arg (=0)
              Simple decimation-style thinning.  Thin the file by removing every t'th point  from
              the file.

       --last-return-only
              Keep last returns (cannot be used with --first-return-only)

       --first-return-only
              Keep first returns (cannot be used with --last-return-only)

       --keep-returns arg
              A list of return numbers to keep in the output file: --keep-returns 1 2 3

       --drop-returns arg
              Return numbers to drop.  For example, --drop-returns 2 3 4 5

       --valid_only
              Keep only valid points

       --keep-classes arg
              A list of classifications to keep: --keep-classes 2 4 12 --keep-classes 2

       --drop-classes arg
              A   comma-separated   list   of   classifications  to  drop:  --drop-classes  1,7,8
              --drop-classes 2

       --keep-intensity arg
              Range in which to keep intensity.  The following expression  types  are  supported:
              --keep-intensity 0-100 --keep-intensity <200 --keep-intensity >400 --keep-intensity
              >=200

       --drop-intensity arg
              Range in which to drop intensity.  The following expression  types  are  supported:
              --drop-intensity <200 --drop-intensity >400 --drop-intensity >=200

       --keep-time arg
              Range  in  which  to  keep  time.   The  following  expression types are supported:
              --keep-time   413665.2336-414092.8462    --keep-time    <414094.8462    --keep-time
              >413665.2336 --keep-time >=413665.2336

       --drop-time arg
              Range  in  which  to  drop  time.   The  following  expression types are supported:
              --drop-time <413666.2336 --drop-time >413665.2336 --drop-time >=413665.2336

       --keep-scan-angle arg
              Range in which to keep scan angle.  The following expression types  are  supported:
              --keep-scan-angle 0-100 --keep-scan-angle <100 --keep-scan-angle <=100

       --drop-scan-angle arg
              Range  in  which to drop scan angle.  The following expression types are supported:
              --drop-scan-angle <30 --drop-scan-angle >100 --drop-scan-angle >=100

       --keep-color arg
              Range in which to keep  colors.   Define  colors  as  two  3-tuples  (R,G,B-R,G,B):
              --keep-color '0,0,0-125,125,125'

       --drop-color arg
              Range  in  which  to  drop  colors.   Define  colors as two 3-tuples (R,G,B-R,G,B):
              --drop-color '255,255,255-65536,65536,65536'

       For   more    information,    see    the    full    documentation    for    lasinfo    at:
       ⟨http://liblas.org/utilities/las2txt.html

EXAMPLE

       Simple conversion to text file

       $ las2txt -i lidar.las -o lidar.txt -parse xyz

       converts LAS file to ASCII and places the x, y, and z coordinate of each point at the 1st,
       2nd, and 3rd entry of each line.  The entries are separated by a space.

       Specifying a separator

       $ las2txt -i lidar.las -o lidar.txt -parse txyzr -sep komma

       converts LAS file to ASCII and places the gps_time as the first entry, the  x,  y,  and  z
       coordinates  at  the 2nd, 3rd, and 4th entry and the number of the return as the 5th entry
       of each line.  The entries are separated by a komma.

       Altering the header separator

       $ las2txt -i lidar.las -o lidar.txt -parse xyzia -sep semicolon -header pound

       converts LAS file to ASCII and places the x, y, and z coordinate at the 1st, 2nd, and  3rd
       entry,  the  intensity  at  the 4th and the scan angle as the 5th entry of each line.  The
       entries are separated by a semicolon.  At the beginning of the file we  print  the  header
       information as a comment starting with a '#' symbol.

       Altering the coordinate order

       $ las2txt -i lidar.las -o lidar.txt -parse xyzcu -sep tab -header percent

       converts  LAS file to ASCII and places the x, y, and z coordinate at the 1st, 2nd, and 3rd
       entry, the classification at the 4th and the user data as the 5th entry of each line.  The
       entries  are  separated  by a semicolon.  At the beginning of the file we print the header
       information as a comment starting with a '%' symbol.

                                         16 February 2019                              las2txt(1)