[Liblas-devel] las2las vertical unit conversion

[Ibraheem Ali]

Hello Everyone,

This process " converting vertical units from foot to meter and vise versa"
is very important and it is usually needed when comparing multiple LiDAR
data from different sources.

Example: " When studying erosion in certain area, we need to have LiDAR data
taken in different time epochs. These data, if you have them, are usually
not in the same measuring units".

In my case, I have the elevation in one set of data in "US Survey feet" and
the other set is in "meter". For now, I'm thinking to do las2txt, then
convert the elevation value, then back to las file.

It would be really nice to have this process implemented in las2las.

Thank you very much,

Best regards,

Ibraheem

On Mon, Nov 1, 2010 at 8:14 PM, Howard Butler <hobu.inc at gmail.com> wrote:

>
> On Nov 1, 2010, at 4:10 PM, Brady Callahan wrote:
>
> > Is there a way to use las2las to convert or scale Z units? I just used
> las2las to translate data from EPSG:26910 to EPSG:2992 and it worked
> fantastic! It took less than 25% of the time that LP360 (GeoCue) does for
> the same operation! However, my Z units (meters) still need to be converted
> to international feet. Is that possible with las2las?
>
> I don't see any reason why we couldn't, but it is not possible just now.
>
> What about:
>
> --point-translate "x*1.0 y*1.0 z*3.2808399"
> --point-translate "z+20"
> --point-translate "z-20"
>
> I'd be interested in hearing feedback on this before implementing for
> 1.6.0b2's las2las.  Look good?
>
> Howard
>
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