LAS 1.5 Revision 00

Summary of MAJOR changes:

• Removed support for legacy Point Data Record Formats 0-5. (#128)
• Added Offset GPS Time definition. (#6)
• CRS support expanded to all published WKT versions, removing support for GeoTIFF CRS encoding. (#95, #104, #109)

Summary of MINOR changes:

• Added Max/Min GPS Time fields to header block. (#118)
• Clarify requirements that the Extra Bytes VLR must be unique. (#150)
• Deprecated legacy Classification Lookup VLR. (#82)
• Reorganization of specification-defined VLR sections.

Summary of INTERNAL changes:

• Finalized implementation of ReadTheDocs to replace ad-hoc Sphinx implementation. (#122)
• GitHub build pipelines now fail faster.
• Misc GitHub management conveniences.
• Explicit endorsement of LAS wiki.
• Aesthetic editorial changes to improve readability.

Full Changelog: 1.4.R16...1.5.R00

LAS 1.4 Revision 16

Readability improvements and clarifications (August 2025).

Summary of OFFICIAL changes:

• Clarified uniformity of GPS Time for all returns of a pulse. (#81)
• Added example usage of Overlap bit. (#5)
• Reworded mandatory zero Classification for Synthetic PDRF0-5. (#86)
• Added Byte Offset columns to Header, VLR, EVLR, and PDRF tables. (#55)
• Clarified how and when certain header fields should be zero-filled. (#101)
• Added Official LAS Wiki section. (#71)
• Clarified source of min/max XYZ and ExtraByte values. (#89)
• More closely aligned data types with C99 definitions. (#115)

Summary of INTERNAL changes:

• Update ASPRS address and phone number.
• Normalize internal refs and links.
• Update CI/CD to RTD, eliminating dependency on Travis and hand-rolled github action.