Unofficial Windows Binaries for Python Extension Packages. By Christoph Gohlke, Laboratory for Fluorescence Dynamics, University of California, Irvine. Updated on 12 May 2020 at 06:54 UTC. This page provides 32- and 64-bit Windows binaries of many scientific open-source extension packages for the official CPython distribution of the Python programming language.

Processing¶

The libLAS command-line utilities provide the bulk ofuser-facing operational software for libLAS, although the underlying libLASlibrary is what powers them. Below is a listing of common operations thatyou might want to do on LAS data, and the utilities and approaches totake to complete those tasks.

Reprojecting an LAS file¶

All LAS data are in some sort of coordinate system, even if that coordinatesystem is not described in the LAS file. For terrestrial LAS data, thesecoordinate system descriptions often map to coordinate systems describedby the EPSG database. Another source of information about coordinatesystems in http://spatialreference.org.

The las2las utility is the tool you will want to use toreproject LAS data. las2las can take advantage of theexisting coordinate system description that might already be specified in theLAS file, or you may override the coordinate system description (or supplyone if none was specified).

We’re going to use an example test/data/srs.las file available fromhttps://github.com/libLAS/libLAS repository which contains only 10 pointsand has a coordinate system defined. Please download this file if youwant to follow along.

las2las is very similar in behavior to another datatranslation utility for raster data – gdal_translate. To reproject data,we must have a description of both the coordinate system we are starting withand a description of the coordinate system we are going to. To find out whatyou are starting with, issue a lasinfo command:

Note Rar to zip converter.

The –no-check option tells lasinfo to only print the header informationfor the file and to not scan through all of the points. For a 10 point file,this of course isn’t much of a concern, but with a 50 or 500 million pointfile, it isn’t worth waiting for a full scan of the data if all youwant is header information.

Our lasinfo invocation tells us that the srs.las fileis in a UTM North Zone 17 coordinate system:

Now that we know our input coordinate system, we can make a decision aboutwhat to reproject the data to. In our first example, we’re going to usethe venerable plate carrée non-coordinate system, EPSG:4326.

Our process succeeds, but after a quick inspection of the data withlasinfooutput.las we see a problem:

The srs.las file had a scale of 0.01, or two decimal places of precisionfor its X, Y, and Z coordinates. For UTM data, this is ok, because it impliesan implicit precision of 1 cm. For decimal degree data of the unprojectedPlate Carrée coordinate system, it causes us to lose a bunch of precision. Weneed to set our scale values to something that can hold more precision in ourcase:

Another quick inspection with lasinfo gives us somethingwe’re more comfortable with:

Vertical datum transformation of an LAS file¶

We’re going to continue what we were doing in Reprojecting an LAS file butadd a twist – we want to change the vertical datum on the data from WGS84to NAVD88.

Assuming you have all of the prerequisites in place, we can do the verticaldatum transformation quite simply (again, worrying about precision as well):

The key point there is adding +5703 to the coordinate system descriptiontells the GDAL/Proj.4 machinery to do a vertical transformation. There areother ways to have these operations happen using WKT and even GeoTIFFkeys, but this is the most simple way to do things via command line.

Assigning color information to a LAS file¶

Note

League Of Legends Hacks (8.11) 2018 For Mac OS X OnAgain Random. The Glitch Mob, Mako, and The Word Alive) Worlds 2018 - League of Legends. How to download league of legends on mac. League Of Legends Hacks (8.11) 2018 For Mac OS X will not let you down and do what this program was made to do. All features are included and described in notes.txt file, notes.txt file will be available after installation. League Of Legends Hacks (8.11) 2018 For Mac OS X has WINDOWS, MAC OS X, and Latest mobile platform support. League of legends hacks 8.11 2018 for mac free. Free Riot Points Hack (WORKING 2018) League Of Legends Mac and has built for MAC OS X. All Macintosh platforms are supported. For any lost Windows user, we added your versions too (win 7, 8, 10). Enjoy Free Riot Points Hack (WORKING 2018) League Of Legends Mac and on all platforms. League Of Legends Hacks (8.11) 2018 For Mac OS X; has been made public on our website after successful testing. This tool will work great on MAC OS and WINDOWS OS platforms. And Latest mobile platforms League Of Legends Hacks (8.11) 2018 For Mac OS X has based on open source technologies, our tool is secure and safe to use. League Of Legends Hacks (8.11) 2019 For Mac OS X for MAC OS X and iOS. This tool will work on your Mac, all latest versions are supported. Our tool is reliable and will do exactly what you expect and more. League Of Legends Hacks (8.11) 2019 For Mac OS X will not only work on MAC but it will work on WINDOWS 10 AND 7 and iOS, Android.

The following example assumes you are working with the Autzen_Stadiumexample file that is available from the http://liblas.org/sample samplelibrary.

Frequent availability of combined terrestrial LiDAR and image captures meansthat its now possible to obtain .las files that you can stylize with RGBimagery. The LAS 1.2 specification provides two different point datatypes that allow storing RGB data as 16 bit integers, but the tools todo the actual intersection operation have been somewhat limited.

libLAS 1.6+ allows you to assign color information to a .las file if GDALis linked in at compile-time.

Note

The LAS specifications only allow two differentpoint format types to store color information – point format 2 and pointformat 3. The difference between point format 2 and point format 3 is that3 also has time stored on it. Additionally, only LAS 1.2 and 1.3 versionssupport storing color information, but libLAS only can write LAS 1.2 as oflibLAS 1.6.0.

1. Unzip the Autzen Stadium data.

2. Issue the las2las call

3. Inspect the lasinfo output and see color informationattached.

Note

Adding color from an image contains more detailed information about this process.

Compressing an LAS file with LASzip¶

libLAS provides the ability to compress data using the fantastic LASzipcompression library.