Skip to main content
Service phase: Beta

This service is still in development. Give us your feedback.

Format

Log ASCII Standard Format

Download XML Download JSON

Summary

Name
Log ASCII Standard Format
Version
1.2
Identifiers
PUID: fmt/389
Format type
  • Text (Structured)
  • Dataset
Description
This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’.
Release date
01 Sep 1990
Format encoding
Text
Note
Specifications available at: http://www.cwls.org/las_info.php
File extensions
las
Submitted by
Digital Preservation Department / The National Archives
Developed by
Canadian Well Logging Society / Canadian Well Logging Society

Relationships

Is previous version of

Internal signatures

Log ASCII Standard 1.2

Description
Header ASCII: ~V followed by version and standard information (VERS. 1.2 CWLS (LOG ASCII STANDARD||Log ASCII standard|LAS) V(ERSION|ersion) 1.2) and then mandatory logging data recorded in Well Information Section (~W), Curve Information section (~C), and ASCII Log Data section (~A).696F6E)20312E32*7E57*7E43*7E41
Provenance
08/2023 (v.113)- Max-offset added to BOF signature to accommodate header bytes. Submitted by The National Library of Australia.

Byte sequences

Min Frag Length
Absolute from BOF
Offset
0
Max offset
148
Byte Sequence
7E56*564552532E*312E32{0-1}3A{0-5}43574C5320(4C4F47204153434949205354414E44415244|4C6F67204153434949205374616E64617264|6C6F67204153434949205374616E64617264|4C4153){1-3}56(455253494F4E|657273696F6E)20312E32*7E57*7E43*7E41
Endianness
None

Changelog

  • V114

    Release date
    22 August 2023

    • Updated

      Log ASCII Standard 1.2: Offset added to signature to accomodate header. Submitted by The National Library of Australia.

  • V105

    Release date
    29 June 2022

    • Updated

      Log ASCII Standard Format: Expanded optional bytes from 0-3 to 0-5 and added optional 'Log ASCII Standard' magic bytes. Submitted by The National Library of Australia.

  • V55

    Release date
    4 January 2012

    • Added format

      Log ASCII Standard Format 1.2: Outline entry added.

    • Added signature

      Log ASCII Standard Format 1.2: Signature developed through PRONOM Research.