MapInfo 64 bit Raster not reading las-files

[Martina Schäfer]

Hello,

I'm mainly using the 64 bit version of MapInfo Discover Bundle and quite often use data from laserscanning for digital elevation models. The point data is stored in LAS-files, but I get an error message when trying to open them in Raster. Going via RASTER - Create Raster - Triangulation, I select the LAS-file(s) as the input file, but then I get the error message that " An error occured readin the LASzip file". I tried both Create Raster and Create Raster Multifile.

However, the LAS-files work nicely when using the 32 bit version of  MapInfo Discover bundle and the Surface module of Discover, thus I can exclude that the LAS-files are corrupt.

Any suggestions why they don't work in the 64 bit version?

Best regards,
Martina Schäfer

Operational and GIS-manager
Biological Mosquito Control
Nedre Dalälven Utvecklings AB
SWEDEN

[Upendra Patel]

Hi Martina,

Ideally 64bit version of MapInfo Raster should work with LAS file. Would it be possible you to share your LAS file with me.

Therefore, I could check why it is not working for you.

Thanks

Upendra Patel

[Martina Schäfer]

Hi,

I tried to attach one of the smaller LAS -files, but even when zipped it was too large and exceeded the limits for the group. Thus I try with a link instead:

https://drive.google.com/file/d/0B9_kP9csS7alUk5ZeTNRQ21ZQzQ/view?usp=sharing

Hope this works and that you find out what's the problem.

Thanks for helping,
Martina

[sam.s.j...@gmail.com]

Hello Martina,

I downloaded your LAS file and it is readable (although that does not mean there isn't anything wrong with it).

A tip - if you search for LASTOOLS you will find a handy program called LASZIP which will convert your "LAS" file to a "LAZ" file. This tool will shrink this 164 MB file to 46 MB. You can load LAS and LAZ files into Pro and switching to LAZ format makes the files more manageable.

I gridded your data using a beta version of MapInfo Pro 17. I picked out the "ground" classified last returns and, via triangulation, produced a nice DEM. Picture attached.

Regards,
Sam.

[Martina Schäfer]

Hello Sam,

thank you for your reply and your tip.I ran into a similar problem with another software for analysing satellite images, and tried the same solution - moving the files to a folder with a shorter path, i.e. an external harddisk. I think the problem might be due to my computer being in Swedish and using my name "Schäfer" while the softwares in English cannot handle the "ä".

From the external harddisk, I could open the files and gridd the data.

Best  regards,

Martina

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