lasgrid with .tif

Hi all,

 

I am trying to merge these tiles together (attached) using this line of code

 

C:/LAStools/bin/lasgrid.exe -v -i J:\tmp03\*.tif -merged -step 1 -o J:/Temp_J/test.tif

 

If I run it with .bil as an input, the line works fine but my tiles are in .tif (happy to transform them if the process is quicker).

 

 

Thanks

Susana

 

Susana Gonzalez - Forest Engineer, LiDAR Science

 

Interpine Group Ltd

Mobile:      021 026 49733   DDI:  +64 7 350 3209 or Australia +61 2 80113645
Skype:        sugonar

Address:   99 Sala Street, PO Box 1209, Rotorua 3010, New Zealand
Website:   www.interpine.co.nz

 

Interpine Innovation is Shaping Today’s Forests with the Technology of Tomorrow

He rangahau tenei ra he hangarau apopo

 

Best regards,

Michal Kus

Hi Susana,

 

Isn’t LASGrid supposed to take LAS/LAZ/XYZ as input and not rasters? To merge rasters I would use GDAL, in QGIS or command line, or ArcGIS if you have a license and prefer a GUI.

 

 

 

CAUTION: This email originated from outside of RPS.

Good morning from Spain,

I agree with what you have been told, I think it is not possible to incorporate a GeoTIFF with the information in LASgrid. The program is designed to rasterize a point cloud and therefore surely the most common input format is not GeoTIFF, the truth is that I am even surprised that it supports BIN (I don't know this) ;-).

With the files you have sent I have made a couple of tests, if the idea is just to join files as other members have recommended you can use directly QGIS or GDAL, if you need to modify the spacing, etc (it could also be done with those programs) I would be more inclined to continue using LAStools.

For me the best option is a conversion of those TIFF to a LAZ, using DEMZIP (with which you will even reduce its size considerably).
656750_7689750.tif (34129 bytes) > 656750_7689750.laz (4544 bytes)
656750_7699000.tif (213661 bytes) > 656750_7699000.laz (31895 bytes)

And then integrate them with LASGRID, which will also provide you with the KML in addition to the GeoTIFF. In addition LASgrid as you know allows you to set the spacing and other parameters for the rasterization.

The sequence would be more or less:
demzip -i *.tif -olaz
lasgrid -i *.laz -merged -step 1 -o dem.tif

In my tests (although the files are very small) it is extraordinarily fast.

I hope you find it useful,

Jorge Delgado
jdel...@ujaen.es

Due to everyone's surprise with the use of the bil file in the lasgrid input, here is a good opportunity to say that all readme files need to be reviewed.
Much of lastools' potential is limited to experienced users in this group. The read_me files have been in need of an update for a few years.

Best Regards,

Hi all,

 

Thanks a lot for all your answers.

 

I think lasgrid supports .bil because Martin liked that format a lot 😊

 

The option that Jorge suggested is good (I will add it to my workflow).

 

In the end, I have run gdal_merge.py as Michael suggested, it was also very fast.

 

Keep in touch.

Susana

 

 

https://youtu.be/rZFxmnvlOP8: Mobile Laser Data Collection in conjunction with VR Analysis for Forest Inventory