LAS点云数据解析工具

16 June 2022 -- changed reference docs from *_README.txt to *_README.md 22 March 2022 -- lasindex: added -o parameter; Fix fseek for gcc for las/lax file > 2Gb 22 March 2022 -- LASlib: added '-iptx_transform' option; 7 January 2022 -- lastrack: extra_byte output bugfix 30 December 2021 -- fix small memory leak in lasreaditemcompressed_v3.cpp 1 December 2021 -- lasclip: merge split output with same shape names 18 November 2021 -- LASlib: new LAStransform '-force_RGB' 12 November 2021 -- LASlib/LASzip merge, bug fix memory leak; add some x64 tool versions 19 July 2021 -- NEW: lasvdatum: vertically moves elevation using ellipsoidal / geoidal difference grids in GTX format 15 July 2021 -- lasinfo: terribly stupid bug fixed for recently added option '-delete_empty' 12 July 2021 -- lasview: bug fix in saving on manual edits. now multiple edits can be saved without restarting the viewer. 11 July 2021 -- lassort: catching quicksort failure with proper ERROR when stack overflow due to exzessive duplicate points 10 July 2021 -- lascopy: added '-keypoint_flag', '-synthetic_flag' and '-overlap_flag' so that all flags can be copied 6 July 2021 -- Potree16: fix for measuring tool bug introduced by recent Google Chrome and Microsoft Edge browser update 5 July 2021 -- NEW: lasprobe: handy tool to probe the elevation of one or many LiDAR files at one indicated x / y position 15 June 2021 -- LASlib: new '-clamp_RGB_to_8bit' transform useful after '-scale_rgb 0.07 0.05 0.05' to avoid 8 bit overflow 10 June 2021 -- lasgrid: added '-color_map color_map.txt' to map small values from 0 to 63 to specified RGB color 10 June 2021 -- lasinfo: new option '-delete_empty' for deleting LAS files with zero points 9 June 2021 -- LASlib: bug fix, disallow simultanous use of '-keep_class' together with '-keep_extended_class' 7 June 2021 -- lasgrid: fixed '-classification_majority_16bit' to support extended classes 5 June 2021 -- lasview: option '-screenshot memoy.ppm' starts the viewer and grabs / stored the first full frame to PPM format. 3 June 2021 -- lasview: new hot-key 'D' that stores screen to 'temp.ppm'. need to let my moy go, but it breaks my heart and more. 31 May 2021 -- lasgrid: use '-extended_classification_variety' to compute different classifications per cell for extended point types 31 May 2021 -- lascopy: new option '-unmatched' activates simple copy of requested attribute in point order 30 May 2021 -- LASlib: bug fix when writing LAS files to ASCII text (extended classifications above 31 were always zero) 30 May 2021 -- demzip: minor bug fix for rare ASC files and new option '-class 2' to set classification in LAZ raster 18 April 2021 -- lascolor: new options '-pairs point_pairs.laz' locally correct image alignment via IDW vectors 10 April 2021 -- LASlib: new '-keep_profile p1_x p1_y p2_x p2_y width' keeps a segment of a certain width 30 March 2021 -- lasdatum: distinguish between '-pvr' and '-cfr' for seven parameter helmert transform 26 March 2021 -- laspublish: added support for PotreeViewer 1.8 (as generated by PotreeConverter 2.1) 24 March 2021 -- LASlib: bug fix only for signed long (I32) in LASattributer.set_value_as_float() 23 March 2021 -- lasdatum: now also supports seven parameter helmert transforms via option '-seven ......' 21 March 2021 -- LASlib: new LAStransform '-set_NIR 255' 16 February 2021 -- LASlib and all LAStools: better detection and ERROR when your LAZ file has corruptions in the LAS header 28 January 2021 -- NEW: lasdatum: perform a datum transform using an NTv2 grid using the GRID.gsb file provided by the national survey 22 January 2021 -- lasduplicate: new option '-unique_xyzt' for marking/removing duplicates where XYZ and GPS time stamps match 17 January 2021 -- lascolor: new options: -band_into_red 0 -band_into_green 1 -band_into_blue 2 -band_into_nir 3 -band_into_intensity 5 15 January 2021 -- LASlib: new magic while reading files: '-divide_registers 0 1 2' and '-subtract_registers 0 1 2' 14 January 2021 -- las2las: new option to add an empty VLR: -add_empty_vlr "hello martin" 4711 "i like laser chickens" 7 December 2020 -- fixed new bug introduced 28 September 2020 for command-line combo '-o out.laz -odix _mist -cpu64' 22 November 2020 -- las2las: when reprojecting only x and y, preserve resolution of z coordinate, if not set explicitely 11 November 2020 -- lasinfo: new option '-set_vlr_record_id 2 4711' changes 'record ID' field of VLR with index 2 11 November 2020 -- lasinfo: new option '-set_vlr_user_id 1 "hello martin"' changes 'user ID' field of VLR with index 1 10 November 2020 -- lasinfo: new option '-set_vlr_description 0 "hello martin"' changes 'description' field of VLR with index 0 1 November 2020 -- lascanopy: new option to output either minimal or maximal GPS time stamp with '-gps_min' or '-gps_max' 30 October 2020 -- las2las: fail / exit with error code when input file is corrupt 10 October 2020 -- LASlib: new '-copy_register_into_R 0', '-copy_register_into_G 1', '-copy_register_into_B 2', '-copy_register_into_NIR 3' 5 October 2020 -- LASlib: new '-scale_NIR 2', '-scale_NIR_down', '-scale_NIR_up', '-scale_NIR_to_8bit', '-scale_NIR_to_16bit' 3 October 2020 -- LASlib: new LAStransforms '-add_registers 0 1 2', '-multiply_registers 0 1 2' and '-translate_register 1 10.7' 2 October 2020 -- lassplit: new option to split based on EXTRA BYTES attributes "-by_attribute_interval 0 1.0" 30 September 2020 -- LASlib: new LAStransforms '-copy_register_into_point_source 1' and 'copy_attribute_into_point_source 0' 28 September 2020 -- lastile: small bug fix for correct '-odix _mist' tile names also when using '-cpu64' switch 23 September 2020 -- LASzip and LASlib: rare fix for reading bit-corrupted LAZ files where chunk table is zeroed 13 August 2020 -- lasgrid: added vertical offset to '-subcircle 0.2 -0.1' to keep tree tops 4 August 2020 -- lasthin: added vertical offset to '-subcircle 0.2 -0.1' to keep tree tops 18 June 2020 -- LASlib: first new LAStransforms that allow 16 temporary registers for intermediate computations 9 May 2020 -- LASlib and all LAStools: fixed PLY reader for files written by Cloud Compare with odd header entry 13 March 2020 -- lastile: fixed bug in combination of '-cpu64' and 'external_tiling tiles.shp' 10 March 2020 -- LASlib and all LAStools: enhanced PLY reader to also support "uint" attributes and properties 9 March 2020 -- LASlib and all LAStools: fixed PLY reader for "double" or "float64" attributes and properties 29 February 2020 -- lastile: exit with ERROR when '-external_tiling index.shp FNAME' does not overlap the input point cloud 24 February 2020 -- las2las: check horizontal datum when reprojecting and also set OCG WKT when point type >= 6 22 February 2020 -- lasclassify: do not fail when all of the input points are ignored, but simply copy the unmodified file 19 February 2020 -- lasclip: bug fix for '-split 0' when DBF attribute is unique number and not unique string as file name 18 February 2020 -- lasinfo: report classification histogram for 'withhelp', 'keypoint', 'synthetic', 'overlap' flagged points 16 February 2020 -- las2dem, lasgrid, lasoverlap: new '-osep space', '-osep tab' or '-osep semicolon' specifies XYZ seperator 15 February 2020 -- LASlib: new transforms '-scale_RGB_to_8bit' and '-scale_RGB_to_16bit' only scale RGB values if needed 14 February 2020 -- LASlib: new '-multiply_divided_intensity_into_RGB_green 255' '-multiply_scaled_intensity_into_RGB_red 0.4' 14 February 2020 -- LASlib: new filter '-keep_RGB_greenness 10 65535' keep points if 2G-R-B falls into specified interval 13 February 2020 -- demzip, demdiff: bug fix for reading rasters whose number of cells (ncols x nrows) is over 2 billion 13 February 2020 -- lasoptimize, lasoptimize64: bug fix for certain GPS time stamp orderings that crashed the tool 10 February 2020 -- lasinfo: handle up to 10 attributes with '-histo attribute0 1.0' through '-histo attribute9 0.1' 10 February 2020 -- LASlib: ne