Las format definition

The .laz and .las output of SURE is based on the POINT DATA RECORD FORMAT 7 (or POINT DATA RECORD FORMAT 8 *),  as specified in the LAS SPECIFICATION Version 1.4 , November 2011 (Revision date - 27 August 2025).
LAS Specification 1.4 - R16

SURE is able to read data up to LAS Version 1.4 and will write point cloud data in LAS Version 1.4

The following information is available in the respective fields:

Item

Format

Size

Interpretation

X

int32_t

4 bytes

X coordinate

Y

int32_t

4 bytes

Y coordinate

Z

int32_t

4 bytes

Z coordinate

Red

uint16_t

2 bytes

Red color channel

Green

uint16_t

2 bytes

Green color channel

Blue

uint16_t

2 bytes

Blue color channel

NIR *

uint16_t

2 bytes

4th color channel, typically Near Infrared channel.
Available only for Results/DSM/laz(s) after True Ortho production and if the input images contain a 4th channel.
Stored according to POINT DATA RECORD FORMAT 8 *.

Intensity

uint16_t

2 bytes

Results/Point_Cloud:

Point precision value that relates to the point depth standard deviation (σ) and the project GSD. The values are computed according to the following formula:

I = (σ / GSD) * 10000

Classification

uint8_t

1 byte

  • Points originating from Dense Matching (real observations): 0 (unclassified)

  • Interpolated points (from DSM Interpolation, only for Results/DSM/las(z)): 32 (synthetic / created, never classified)

  • Correction shapefile points (based on the interpolation from correction shapefile, in Results/DSM/las and in Results/Point_Cloud): 32 (synthetic / created, never classified)

  • Waterbody shapefile points (based on the interpolation from the waterbody shapefile, in Results/DSM/las and in Results/Point_Cloud): 41 (synthetic / Water)

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