**************************************************************** lastile: tiles a potentially very large amount of LAS points from one or many files into square non-overlapping tiles of a specified size and save them into LAS or LAZ format. The square tiling used by lastile is chosen for two reasons: (a) it is by far the most common way that LAS files are tiled for archival or distribution (b) it can (potentially) be exploited by our "streaming TIN" code for seamless & memory-efficient Delaunay triangulation of large amounts of tiles. A small VLR added to the header of each generated LAS/LAZ tile stores the tile index in the square quad-tree from which its min/max extend can be computed. The VLR also tells LAStools whether a tile has buffers. Why are buffers important? See: http://rapidlasso.com/2015/08/07/use-buffers-when-processing-lidar-in-tiles/ The tool can either operate in one or in two reading passes via a commandline switch ('-extra_pass'). The additional reading pass is used to collect information about how many points fall into each cell. This allows us to deallocate LASwriters for tiles that have seen all their points. This is *only* really needed when writing LASzip compressed output of very large tilings to avoid having the LASwriters using LASzip compression for all tiles in memory at the same time. Optionally the tool can also create a small '-buffer 10' around every tile where the parameter 10 specifies the number of units each tile is (temporarily) grown in each direction. It is possible to remove the buffer from a tile by running lastile across all tiles again but with the '-remove_buffer' option. You can also '-flag_as_withheld' or '-flag_as_synthetic' all of the buffer points to drop them more easily with the standard filters. Optionally the tool can also create an '-reversible' tiling that will allow to recreate the original file from all the individual tiles. This is useful to, for example, break a large LAS file into many tiles with buffers, classify each tile individually with lasclassify.exe or compute the height of each point with lasheight.exe, and then put the original large LAS file back together with '-reverse_tiling'. Note that for the unlicensed version the gps_time is set to zero and the point are permutated a tiny bit. Do *not* use this option unless you are *really* sure you need it. In order to prevent the bounding box in the LAS header from being shrunk to the actual extent of the points and set it to the full extent of the corresponding tile use '-full_bb'. This will pad the tiles to tile size plus buffer when run in '-buffer 20' mode. Used together with '-remove_buffer' this option results all tiles being set to the full extent of each tile after the offset was removed. It is also possible to create adaptive tilings. Start with the largest desired tile size and add '-refine 10000000' or '-refine_tiling 10000000' as an option to the command line. Next call lastile again using all the just generated tiles as input and instruct lastile to '-refine_tiles 10000000'. You may repeat if greater adaptivity is needed. This is especially useful for surveys with great density variation, like mobile, terrestrial, and UAV scans. Here a small example: lastile -i mobile_scan/strip0*.laz ^ -tile_size 1024 -buffer 5 ^ -refine_tiling 10000000 ^ -odir tiles_raw -o singapore.laz lastile -i tiles_raw/singapore*_1024.laz ^ -refine_tiling 10000000 ^ -olaz ^ -cores 4 lastile -i tiles_raw/singapore*_512.laz ^ -refine_tiling 10000000 ^ -olaz ^ -cores 4 lastile -i tiles_raw/singapore*_256.laz ^ -refine_tiling 10000000 ^ -olaz ^ -cores 4 lastile -i tiles_raw/singapore*_128.laz ^ -refine_tiling 10000000 ^ -olaz ^ -cores 4 By default a tile gets deleted after it was refined into four smaller tiles. Add '-dont_delete_refined' to the command line to keep the original tiles around. To shift the tiling off its standard modulo tile_size tiling you can use the '-tile_ll 25 75' option. If you run lastile in parallel using '-cores 4' or so it is *REALLY* important that your input data is spatially indexed or things will slow down a lot (as each tile requires reading the entire input). Make sure you run lasindex to create a LAX file for each input file before lastiling on mutiple cores. For those who have user-defined tilings to deliver there is also the option '-external_tiling tiles_utm_600m.shp TNAME' that expects a SHP files with rectangular tiles with a corresponding string attribute called TNAME in the DBF file. Please license from martin.isenburg@rapidlasso.com to use LAStools commercially. For updates check the website or join the LAStools mailing list. http://lastools.org/ http://groups.google.com/group/lastools/ http://twitter.com/lastools/ http://facebook.com/lastools/ http://linkedin.com/groups?gid=4408378 Martin @lastools **************************************************************** example usage: >> lastile -i *.las -o tile.las tiles all points from all files using the default tile size of 1000. >> lasindex -i *.laz -cores 8 >> lastile -i *.laz -files_are_flightlines -buffer 25 -o tiles\tile.laz -cores 4 spatially indexes all compressed LAZ files and then tiles them on 4 cores using the default tile size of 1000 and a buffer of 25 while setting the point source ID of each point to the file number it is from. >> lastile -i *.las -full_bb -o tile.laz same but sets the bounding box in the header to the full extend of all tiles (rather than to the actual extent of its points) and also compresses the while writing them tiles >> mkdir tiles >> mkdir tiles_no_buffer >> lastile -i *.las -buffer 10 -o tiles\tile.las >> lastile -i tiles\tile_*.las -remove_buffer -odir tiles_no_buffer -olaz each tile gets buffer points for 10 units in all directions. also puts the tiles into directory 'tiles'. the second command removes all buffer points and writes the tiles compressed to the 'tiles_no_buffer' folder >> lastile -i large.laz -tile_size 500 -buffer 10 -reversible -o tile.laz >> lastile -i tile_*.laz -reverse_tiling -o large_reversed.laz tiles file 'large.laz' with tile size 500 and buffer 10 in reversible mode. the second command removes all buffer points, reconstructs the original point order, and stored the result as 'large_reversed.laz'. >> mkdir toronto >> lastile -i *.txt -iparse xyzti -odir toronto -o tile.laz same but with on-the-fly converted ASCII input >> lastile -i in1.las in2.las in3.las -o sydney.laz -tile_size 500 tiles the points from the three LAS files with a tile size of 500. >> mkdir outer_banks >> lastile -lof obx_files.txt -keep_class 2 3 -tile_size 100 -odir outer_banks -o tile.laz tiles all LAS/LAZ files listed in the text file with a tile size of 100 keeping only points with classification 2 or 3 >> lastile -lof file_list.txt -o tile.laz -extra_pass tiles all LAS/LAZ files listed in the text file into a LASzip compressed tiling using the default tile size of 1000 and uses an extra read pass in an attempt to use less memory. >> mkdir toronto >> lastile -i huge.laz -last_only -odir toronto -o tile.laz tiles the last returns from huge.laz into compressed tiling. for more info: C:\software\LAStools\bin>lastile -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 martin.isenburg@rapidlasso.com) version 181109 (commercial) usage: lastile -i *.las -o tile.las lastile -i *.las -o tiles\tile.laz lastile -i toronto.las -tile_size 500 -odir tiles -o toronto.las lastile -v -lof tahoe_files.txt -extra_pass -o tahoe.laz lastile -v -i file1.laz file2.laz file3.laz -o airport\tile.laz lastile -lof lidar_files.txt -last_only -tile_size 100 -o tile.las lastile -i flight1*.laz flight2*.laz -tile_size 250 -buffer 25 -o obx.laz lastile -i huge.laz -tile_size 250 -buffer 25 -reversible -o tiles\huge.laz lastile -h --------------- if you find bugs let me (martin.isenburg@rapidlasso.com) know.