Skip to main content
U.S. flag

An official website of the United States government

Clarify Intensity Requirement

The current requirement states the intensity values "shall be normalized to 16-bit" as is stated in the LAS specification version 1.4–R15 (ASPRS, 2011). The LAS specification, however, further explains that the value is scaled to the intensity dynamic range of the sensor. This revision updates the LBS to clarify that the intensity is to be scaled to the sensor, not normalized to the scene. 

Current requirement: 

In LBS 2022 rev. A: Collection Requirements: Intensity Values:
  • The intensity values recorded in the LAS files shall be normalized to 16 bit, as required by the LAS specification version 1.4–R15 (ASPRS, 2011).
  • Intensity normalization shall be strictly linear.
In LBS 2022 rev. A: Deliverables: Classified Point Data
  • Intensity values, normalized to 16-bit. See LAS specification version 1.4–R15 (ASPRS, 2011) for additional information. 

Change to: 

In LBS 2022 rev. A: Collection Requirements: Intensity Values:
  • Remove requirement from Collection Requirements and move to Deliverables (see below).
In Data Processing and Handling, after LAS File Format, add: 
Intensity 
  • Intensity values recorded in the LAS files shall be linearly scaled to 16-bit data relative to the maximum intensity dynamic range of the sensor.  

  • Scaling shall not be relative to a maximum in the collected data. See LAS specification version 1.4–R15 (ASPRS, 2011) for additional information. 

In Deliverables: Classified Point Data: Reword the current requirement to read:  
  • Intensity values, linearly scaled to 16 bits. See LAS specification version 1.4–R15 (ASPRS, 2011) for additional information. 

Reference

American Society for Photogrammetry and Remote Sens­ing (ASPRS), 2011, LAS specification (ver. 1.4–R15, July 2019): Bethesda, Md., American Society for Photogram­metry and Remote Sensing, 27 p. [Also available at http://www.asprs.org/wp-content/uploads/2019/07/LAS_1_4_r15.pdf.]