reads LIDAR data in the LAS format and computes statistics that tell us whether the precision “advertised” in the header is really in the data. Often I find that the scaling factors of a LAS/LAZ file is miss-leading because they make it appear as if there was much more precision than there really is. To […]
This tool classifies, flags, or removes LiDAR points based on their approximate xy distance from polygonal segments. This distance is calculated on a grid with a spacing of 0.5 meters by default. With ‘-step_xy 1.0’ the granularity of this grid can be adjusted up or down. Please license from info@rapidlasso.de before using lasdistance commercially. Please
compares the LIDAR data of two LAS/LAZ/ASCII files and reports whether they are identical or whether they are different. See README file for more information.
Transforms LiDAR from one horizontal datum to another using either a NTv2 grid or a seven parameter helmert transform. Note that there are two ways of specifying the rotational part of the Helmert transform. The Position Vector Transformation (PVR) convention and the Coordinate Frame Rotation (CFR) convention.The difference between them is that their rotation matrix
This tool copies selected attributes from LiDAR points from a source to a target LAS/LAZ file using the GPS-time stamp and the return number as a reference. By default the selected attributes of the source points are copied to all target points if the two share the exact samecombination of GPS-time stamp and return number.
This tool flags or removes noise points in LAS/LAZ/BIN/ASCII files. The tool looks for isolated points according to certain criteria that can be modified via ‘-step 3’ and ‘-isolated 3’ as needed. The default for step is 4 and for isolated is 5. It is possible to specify the xy and the z size of
is a tool that splits LAS or LAZ files into multiple files based on some criteria. By default it splits the points into separate files based on the ‘point source ID’ field that usually contains the flightline ID. Others options are The last of these simply splits the input into chunks of 1000000 points. One
tiles a potentially very large amount of LAS/LAZ/ASCII points from one or many files into square non-overlapping tiles of a specified size and save them into LAS or LAZ format. 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
finds and removes all duplicate points from a LAS/LAZ/ASCII file. In the default mode those are xy-duplicate points that have identical x and y coordinates. The first point survives, all subsequent duplicates are removed. It is also possible to keep the lowest points amongst all xy-duplicates via ‘-lowest_z’. It is also possible to remove only
sorts the points of a LAS/LAZ/ASCII file into z-order arranged cells of a square quad tree and saves them into LAS or LAZ format. This is useful to bucket together returns from different swaths or to merge first and last returns that were stored in separate files. Alternatively lassort can sort a LAS/LAZ file in
