How do I manually set all points to have a specific class ID
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Jonathan Greenberg
Aug 31, 2018, 4:49:36 PM8/31/18
to LAStools - efficient tools for LiDAR processing
Given a .laz/.las file -- is there a way to manually specify the classification value for ALL points? What's the trick?
Martin Isenburg
Sep 1, 2018, 6:55:33 AM9/1/18
to LAStools - efficient command line tools for LIDAR processing
Hello,
easy.
las2las -i in.laz -set_classification 0 -o out.laz
E:\LAStools\bin>las2las -h
[...]
Modify the classification.
-set_classification 2
[...]E:\LAStools\bin>las2las -h
Filter points based on their coordinates.
-keep_tile 631000 4834000 1000 (ll_x ll_y size)
-keep_circle 630250.00 4834750.00 100 (x y radius)
-keep_xy 630000 4834000 631000 4836000 (min_x min_y max_x max_y)
-drop_xy 630000 4834000 631000 4836000 (min_x min_y max_x max_y)
-keep_x 631500.50 631501.00 (min_x max_x)
-drop_x 631500.50 631501.00 (min_x max_x)
-drop_x_below 630000.50 (min_x)
-drop_x_above 630500.50 (max_x)
-keep_y 4834500.25 4834550.25 (min_y max_y)
-drop_y 4834500.25 4834550.25 (min_y max_y)
-drop_y_below 4834500.25 (min_y)
-drop_y_above 4836000.75 (max_y)
-keep_z 11.125 130.725 (min_z max_z)
-drop_z 11.125 130.725 (min_z max_z)
-drop_z_below 11.125 (min_z)
-drop_z_above 130.725 (max_z)
-keep_xyz 620000 4830000 100 621000 4831000 200 (min_x min_y min_z max_x max_y max_z)
-drop_xyz 620000 4830000 100 621000 4831000 200 (min_x min_y min_z max_x max_y max_z)
Filter points based on their return numbering.
-keep_first -first_only -drop_first
-keep_last -last_only -drop_last
-keep_second_last -drop_second_last
-keep_first_of_many -keep_last_of_many
-drop_first_of_many -drop_last_of_many
-keep_middle -drop_middle
-keep_return 1 2 3
-drop_return 3 4
-keep_single -drop_single
-keep_double -drop_double
-keep_triple -drop_triple
-keep_quadruple -drop_quadruple
-keep_number_of_returns 5
-drop_number_of_returns 0
Filter points based on the scanline flags.
-drop_scan_direction 0
-keep_scan_direction_change
-keep_edge_of_flight_line
Filter points based on their intensity.
-keep_intensity 20 380
-drop_intensity_below 20
-drop_intensity_above 380
-drop_intensity_between 4000 5000
Filter points based on classifications or flags.
-keep_class 1 3 7
-drop_class 4 2
-keep_extended_class 43
-drop_extended_class 129 135
-drop_synthetic -keep_synthetic
-drop_keypoint -keep_keypoint
-drop_withheld -keep_withheld
-drop_overlap -keep_overlap
Filter points based on their user data.
-keep_user_data 1
-drop_user_data 255
-keep_user_data_below 50
-keep_user_data_above 150
-keep_user_data_between 10 20
-drop_user_data_below 1
-drop_user_data_above 100
-drop_user_data_between 10 40
Filter points based on their point source ID.
-keep_point_source 3
-keep_point_source_between 2 6
-drop_point_source 27
-drop_point_source_below 6
-drop_point_source_above 15
-drop_point_source_between 17 21
Filter points based on their scan angle.
-keep_scan_angle -15 15
-drop_abs_scan_angle_above 15
-drop_abs_scan_angle_below 1
-drop_scan_angle_below -15
-drop_scan_angle_above 15
-drop_scan_angle_between -25 -23
Filter points based on their gps time.
-keep_gps_time 11.125 130.725
-drop_gps_time_below 11.125
-drop_gps_time_above 130.725
-drop_gps_time_between 22.0 48.0
Filter points based on their RGB/CIR/NIR channels.
-keep_RGB_red 1 1
-drop_RGB_red 5000 20000
-keep_RGB_green 30 100
-drop_RGB_green 2000 10000
-keep_RGB_blue 0 0
-keep_RGB_nir 64 127
-keep_NDVI 0.2 0.7 -keep_NDVI_from_CIR -0.1 0.5
-keep_NDVI_intensity_is_NIR 0.4 0.8 -keep_NDVI_green_is_NIR -0.2 0.2
Filter points based on their wavepacket.
-keep_wavepacket 0
-drop_wavepacket 3
Filter points based on extra attributes.
-keep_attribute_above 0 5.0
-drop_attribute_below 1 1.5
Filter points with simple thinning.
-keep_every_nth 2 -drop_every_nth 3
-keep_random_fraction 0.1
-keep_random_fraction 0.1 4711
-thin_with_grid 1.0
-thin_pulses_with_time 0.0001
-thin_points_with_time 0.000001
Boolean combination of filters.
-filter_and
Transform coordinates.
-translate_x -2.5
-scale_z 0.3048
-rotate_xy 15.0 620000 4100000 (angle + origin)
-translate_xyz 0.5 0.5 0
-translate_then_scale_y -0.5 1.001
-transform_helmert -199.87,74.79,246.62
-transform_helmert 598.1,73.7,418.2,0.202,0.045,-2.455,6.7
-switch_x_y -switch_x_z -switch_y_z
-clamp_z_below 70.5
-clamp_z 70.5 72.5
-copy_attribute_into_z 0
-copy_intensity_into_z
Transform raw xyz integers.
-translate_raw_z 20
-translate_raw_xyz 1 1 0
-translate_raw_xy_at_random 2 2
-clamp_raw_z 500 800
Transform intensity.
-set_intensity 0
-scale_intensity 2.5
-translate_intensity 50
-translate_then_scale_intensity 0.5 3.1
-clamp_intensity 0 255
-clamp_intensity_above 255
-copy_RGB_into_intensity
-copy_NIR_into_intensity
-copy_attribute_into_intensity 0
-bin_gps_time_into_intensity 0.5
Transform scan_angle.
-scale_scan_angle 1.944445
-translate_scan_angle -5
-translate_then_scale_scan_angle -0.5 2.1
Change the return number or return count of points.
-repair_zero_returns
-set_return_number 1
-set_extended_return_number 10
-change_return_number_from_to 2 1
-set_number_of_returns 2
-set_number_of_returns 15
-change_number_of_returns_from_to 0 2
Modify the classification.
-set_classification 2
-set_extended_classification 41
-change_classification_from_to 2 4
-classify_z_below_as -5.0 7
-classify_z_above_as 70.0 7
-classify_z_between_as 2.0 5.0 4
-classify_intensity_above_as 200 9
-classify_intensity_below_as 30 11
-classify_intensity_between_as 500 900 15
-classify_attribute_below_as 0 -5.0 7
-classify_attribute_above_as 1 70.0 7
-classify_attribute_between_as 1 2.0 5.0 4
-change_extended_classification_from_to 6 46
-move_ancient_to_extended_classification
Change the flags.
-set_withheld_flag 0
-set_synthetic_flag 1
-set_keypoint_flag 0
-set_overlap_flag 1
Modify the extended scanner channel.
-set_scanner_channel 2
-copy_user_data_into_scanner_channel
Modify the user data.
-set_user_data 0
-scale_user_data 1.5
-change_user_data_from_to 23 26
-change_user_data_from_to 23 26
-copy_attribute_into_user_data 1
Modify the point source ID.
-set_point_source 500
-change_point_source_from_to 1023 1024
-copy_user_data_into_point_source
-copy_scanner_channel_into_point_source
-merge_scanner_channel_into_point_source
-split_scanner_channel_from_point_source
-bin_Z_into_point_source 200
-bin_abs_scan_angle_into_point_source 2
Transform gps_time.
-set_gps_time 113556962.005715
-translate_gps_time 40.50
-adjusted_to_week
-week_to_adjusted 1671
Transform RGB/NIR colors.
-set_RGB 255 0 127
-set_RGB_of_class 9 0 0 255
-scale_RGB 2 4 2
-scale_RGB_down (by 256)
-scale_RGB_up (by 256)
-switch_R_G -switch_R_B -switch_B_G
-copy_R_into_NIR -copy_R_into_intensity
-copy_G_into_NIR -copy_G_into_intensity
-copy_B_into_NIR -copy_B_into_intensity
-copy_intensity_into_NIR
Supported LAS Inputs
-i lidar.las
-i lidar.laz
-i lidar1.las lidar2.las lidar3.las -merged
-i *.las - merged
-i flight0??.laz flight1??.laz
-i terrasolid.bin
-i esri.shp
-i nasa.qi
-i lidar.txt -iparse xyzti -iskip 2 (on-the-fly from ASCII)
-i lidar.txt -iparse xyzi -itranslate_intensity 1024
-lof file_list.txt
-stdin (pipe from stdin)
-rescale 0.01 0.01 0.001
-rescale_xy 0.01 0.01
-rescale_z 0.01
-reoffset 600000 4000000 0
Fast AOI Queries for LAS/LAZ with spatial indexing LAX files
-inside min_x min_y max_x max_y
-inside_tile ll_x ll_y size
-inside_circle center_x center_y radius
Supported LAS Outputs
-o lidar.las
-o lidar.laz
-o xyzta.txt -oparse xyzta (on-the-fly to ASCII)
-o terrasolid.bin
-o nasa.qi
-odir C:\data\ground (specify output directory)
-odix _classified (specify file name appendix)
-ocut 2 (cut the last two characters from name)
-olas -olaz -otxt -obin -oqfit (specify format)
-stdout (pipe to stdout)
-nil (pipe to NULL)
LAStools (by mar...@rapidlasso.com) version 180831
usage:
las2las -i *.las -utm 13N
las2las -i *.laz -first_only -olaz
las2las -i *.las -drop_return 4 5 -olaz
las2las -latlong -target_utm 12T -i in.las -o out.las
las2las -i in.laz -target_epsg 2972 -o out.laz
las2las -point_type 0 -lof file_list.txt -merged -o out.las
las2las -remove_vlr 2 -scale_rgb_up -i in.las -o out.las
las2las -i in.las -keep_xy 630000 4834500 630500 4835000 -keep_z 10 100 -o out.las
las2las -i in.txt -iparse xyzit -keep_circle 630200 4834750 100 -oparse xyzit -o out.txt
las2las -i in.las -remove_padding -keep_scan_angle -15 15 -o out.las
las2las -i in.las -rescale 0.01 0.01 0.01 -reoffset 0 300000 0 -o out.las
las2las -i in.las -set_version 1.2 -keep_gpstime 46.5 47.5 -o out.las
las2las -i in.las -drop_intensity_below 10 -olaz -stdout > out.laz
las2las -i in.las -last_only -drop_gpstime_below 46.75 -otxt -oparse xyzt -stdout > out.txt
las2las -i in.las -remove_all_vlrs -keep_class 2 3 4 -olas -stdout > out.las
las2las -h
On Fri, Aug 31, 2018 at 9:46 PM, Jonathan Greenberg <jgr...@gmail.com> wrote:
Given a .laz/.las file -- is there a way to manually specify the classification value for ALL points? What's the trick?
--
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Jonathan Greenberg
Sep 7, 2018, 9:11:07 PM9/7/18
to LAStools - efficient tools for LiDAR processing
Ah, I thought so but I was trying to set the class to be 101 -- which was being rejected. I assume there is a max value for class ids?
--j
Martin Isenburg
Sep 8, 2018, 3:06:22 PM9/8/18
to LAStools - efficient command line tools for LIDAR processing
Hello,
the most common point types 0, 1, 2, and 3 only support classification values between 0 and 31. You need to "upgrade" your points to the new point types 6, 7, or 8 of LAS 1.4 in order to set a classification code between 0 and 255 and to make the distinction clear there is a different '-set_extended_classification 101' command line switch. Below an example:
C:\LAStools\bin>las2las -i ..\data\fusa.laz -set_point_type 6 -o fusa_pt6.laz
C:\LAStools\bin>las2las -i fusa_pt6.laz -set_extended_classification 101 -o fusa_pt6_c101.laz
C:\LAStools\bin>lasinfo fusa_pt6_c101.laz
lasinfo (180907) report for 'fusa_pt6_c101.laz'
reporting all LAS header entries:
file signature: 'LASF'
file source ID: 0
global_encoding: 0
project ID GUID data 1-4: 00000000-0000-0000-0000-000000000000
version major.minor: 1.4
system identifier: 'LAStools (c) by rapidlasso GmbH'
generating software: 'las2las (version 180907)'
file creation day/year: 40/2010
header size: 375
offset to point data: 469
number var. length records: 1
point data format: 6
point data record length: 30
number of point records: 0
number of points by return: 0 0 0 0 0
scale factor x y z: 0.01 0.01 0.01
offset x y z: 0 0 0
min x y z: 277750.00 6122250.00 42.21
max x y z: 277999.99 6122499.99 64.35
start of waveform data packet record: 0
start of first extended variable length record: 0
number of extended_variable length records: 0
extended number of point records: 277573
extended number of points by return: 263413 13879 281 0 0 0 0 0 0 0 0 0 0 0 0
variable length header record 1 of 1:
reserved 43707
user ID 'LASF_Projection'
record ID 34735
length after header 40
description 'by LAStools of Martin Isenburg'
GeoKeyDirectoryTag version 1.1.0 number of keys 4
key 1024 tiff_tag_location 0 count 1 value_offset 1 - GTModelTypeGeoKey: ModelTypeProjected
key 3072 tiff_tag_location 0 count 1 value_offset 32754 - ProjectedCSTypeGeoKey: WGS 84 / UTM 54S
key 3076 tiff_tag_location 0 count 1 value_offset 9001 - ProjLinearUnitsGeoKey: Linear_Meter
key 4099 tiff_tag_location 0 count 1 value_offset 9001 - VerticalUnitsGeoKey: Linear_Meter
LASzip compression (version 3.2r4 c3 50000): POINT14 3
reporting minimum and maximum for all LAS point record entries ...
X 27775000 27799999
Y 612225000 612249999
Z 4221 6435
intensity 10 62293
return_number 1 3
number_of_returns 1 3
edge_of_flight_line 0 0
scan_direction_flag 0 0
classification 0 0
scan_angle_rank 79 103
user_data 0 197
point_source_ID 1 1
gps_time 5880.963028 5886.739738
extended_return_number 1 3
extended_number_of_returns 1 3
extended_classification 101 101
extended_scan_angle 13167 17167
extended_scanner_channel 0 0
number of first returns: 263413
number of intermediate returns: 283
number of last returns: 263370
number of single returns: 249493
overview over extended number of returns of given pulse: 249493 27232 848 0 0 0 0 0 0 0 0 0 0 0 0
histogram of extended classification of points:
277573 extended classification (101)
--
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