LAS -- Log ASCII Standard
This LAS information site provides links to the File Specifications of the various versions of LAS, plus links to LAS Software. LAS versions 1.2 and 2.0 were written and maintained by the CWLS as public domain well log data formats. LAS version 3.0 was written and is maintained in the public domain by the LAS 3 Committee. You are free to use and distribute these data format Specifications and related Software provided you recognize the ownership of LAS 1.2 and LAS 2.0 Specifications and Software belong to CWLS, and ownership of LAS 3.0 Specifications and Software belong to the LAS 3 Committee.
The following links are presented in two groups: LAS Specifications, and LAS Software & Examples. Select a link from the first group to download the file format Specifications for the corresponding version of LAS. Use the second group of links if you want to download LAS 2.0 or LAS 3.0 examples or Software.
The LAS Version 2.0 link in the second group will initiate the download of an EXE file (a self-extracting ZIP file under DOS,) containing the LAS Version 2.0 Specifications, Software and several examples. The LAS Version 2.0 Specifications are not immediately available after extracting this archive. Run CERTIFY on one of the example LAS files, and before the application is finished you will be given an opportunity to read the LAS Version 2.0 Specifications, or write them to a file.
The LAS Version 2.0 Software available here includes two DOS applications: LAS Certify and LAS Reformat. LAS Certify is an application to certify that an LAS file conforms to the indicated LAS format specification. LAS Reformat is a utility to extract or reformat LAS data in various ways, or resample the LAS data at a different increment or step than the original LAS file. (C source code for Reformat is included.) Both of these applications can be run under MS Windows using the DOS Command Prompt window.
LAS Version 3.0 Certify is the only LAS Version 3.0 Software available here. This MS Windows compatible application handles LAS Version 3.0 and earlier data files. In addition to the ease of use inherent with a Windows application, this LAS Certify application performs more rigorous and detailed checks than the LAS Certify which is part of the LAS Version 2.0
The LAS 3 Committee chose to not create an LAS 3.0 version of Reformat, preferring to leave that for commercial software developers.
LAS Specifications
LAS 1.2 Specifications (Text File)
LAS 2.0 Specifications (Text File)
LAS Version 2.0 What's New (Text File)
LAS Version 2.0 Readme file (Text File)
LAS Version 3.0 (Adobe Acrobat File)
LAS Software and Examples
LAS Version 2.0 Specifications, Software & Examples (EXE File - self extracting ZIP under DOS)
LAS Version 3.0 Example (ZIP File)
LAS Version 3.0 Certify Software (Windows based LAS certification program Nov-2000)
Also handles LAS Version 1.2 and 2.0 data files.)
If you have any questions please contact:
Ken Heslop, P.Eng.
Oakrock Ltd.
P.O. Box 92, Irricana, AB, CANADA T0M 1B0
1 (403) 935-4641
Chairman, CWLS LAS Committee
Chairman, LAS 3 Committee
