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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.php

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.

                                 2 August 2014                      las2txt(1)



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