qgis and extra-bytes

[a.cottin]

Hello Martin,

I have a question for you.
I have a LAZ file with the CHM value store in an Extra-Byte. I was trying to rasterize this extra-bytes using the QGIS toolsbox but seems impossible...

Can you confirm this, and if not, can you tell me how to achieve this...

Cheers.
Antoine

[Martin Isenburg]

Hello Antoine,

Currently it is not possible to rasterize attributes stored as "extra bytes" in an LAS or LAZ file with LAStools and that is neither festive nor seasonal ... (-:

For more merry days ahead adding this functionality is definitely required. Let's  hope you have not been too much more naughty than nice. Maybe you could send Santa a link to a sample LAZ file that has normalized heights stored as "extra elves" via an off-list message to ho_h...@rapidlasso.com and I'll try to pull some (harp) strings for you ... (-:

Happy Holidays!!!

Martin @rapidlasso

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[Martin Isenburg]

Hello Antoine,

the features you have requested have been added to lasgrid and las2dem. In the latest version 160106 you can now specify

lasgrid -i lidar.laz -step 2 -fill 1 -attribute 0 -o dem.bil

or

las2dem -i lidar.laz -step 0.5 -attribute 0 -false -o dem.png

Other new features in the 160106 release are:

- lasgrid, las2dem: can raster '-attribute [0|1|2...]' stored as "Extra Bytes"

- lasground: option '-by_flightline' allows to ground-classify flightlines separately

- LAStools: parse 'pcs.csv' file whenever an unknown EPSG code is encountered

- las2las & txt2las: create OGC WKT string for CRS for full LAS 1.4 compliance 

- all GUIs: can create a directory when browsing for one via pop-up window

There is also the prototype of a new tool called "laspublish" that is based on Potree. More on that one later but give it a try if you are curious ...

Martin @rapidlasso