[Qgis-user] LiDAR Data in QGIS

[Tyler Veinot]

Randy;
I figured as much; the DEM/DSM/DTM's were delivered to us from the province
in that Esri Binary Grid Format, so we do not have the original LiDAR
LAS/LAZ files on hand. It would also seem that we didn't keep the LAS/LAZ
files from the original 2003 LiDAR survey of the city either.
I sent an email to the province to see if they have and are willing to
share the original data but got no reply as of yet.
Tyler

On Mon, Dec 11, 2017 at 9:10 AM, Randal Hale <
rjhale at northrivergeographic.com> wrote:

> I've only been watching this thread when I remember - so My apologies.
>
> If I go back to the original thread - if these are in ADF I believe that's
> ESRI's GRID Format. Which means they are what they are and you can't do
> much
> with them. They have only the last return (or if I remember correctly
> returns
> classed 2,8, etc).
>
> If you have zlas, las, or laz - I would suggest GRASS for processing:
> https://
> grasswiki.osgeo.org/wiki/LIDAR
>
> If you don't have any of the las/laz formats - you might want to do some
> research and see if they were delivered with the LIDAR dataset you have or
> if
> they weren't request them. They may be sitting somewhere on a
> shelf/forgotten
> folder on a server. You can do a lot more with the original LIDAR files
> like
> pull tree heights or possibly rebuild the surface (be it dsm/dtm/dem etc).
>
> Randy
>
> --
> Randal Hale
> North River Geographic Systems. Inc
> rjhale at northrivergeographic.com
> (423) 653-3611
>
>
>
> On Monday, December 11, 2017 7:27:00 AM EST Tyler Veinot wrote:
> > All;
> > But if I convert the DEM or DSM to geotiff I still wont get back the hit
> > order or the classification values will I? I will just have the data I
> have
> > as processed in a different format. What I really need is the original
> > LiDAR datasets if I am understanding this correctly.
> > As for DTM, DSM, and DEM, The province my municipality is in has decided
> > that; DTM is a surface model which includes surface features + ground
> hits
> > + breaklines. A DEM is ground hits, and a DSM as is the surface +
> features
> > without added breaklines. I have found definitions online to support both
> > view points on the matter; just an FYI my text books agree with you on
> the
> > matter. I blame AutoCAD/CADD users for the discrepancies because, in my
> > experience according to the EIT's and other CADD users, a DTM is all of
> the
> > above and a DSM and DEM doesn't exist lol.
> > Thanks for the help on this;
> > Tyler
> >
> >
> > On Mon, Dec 11, 2017 at 6:31 AM, Richard McDonnell <
> richard.mcdonnell at opw.ie
> > > wrote:
> > >
> > > Morning Tyler.
> > > Nick is quite right. The files you have (ADF) are either DTM's or
> DSM's.
> > > They are processed datasets.
> > > To fix the GRASS, SAGA issue, you can use GDAL to convert them to
> GeoTiff,
> > > using the gdal_translate, which can be found in the Processing toolbox
> and
> > > will do it for a few using batch (Note Point one below).
> > > The other option would be to use the Script below to convert ADF to
> > > GeoTiff.
> > >
> > > *@echo off
> > > SET startpath=%1
> > > FOR /R %startpath% %%f IN (w001001.adf) do (call :translate "%%f")
> > > pause
> > > GOTO :eof
> > >
> > > :translate
> > > :
> > >   SET var=%~dp1
> > >   ECHO Translating %var%hdr.adf to %var:~0,-1%.tif
> > >   gdal_translate -co "NUM_THREADS=ALL_CPUS" -co "TILED=YES" -co
> > >   "COMPRESS=LZW" %var%hdr.adf %var:~0,-1%.tif*>
> > > The tool/script works in the following way.
> > >
> > >    1. *ADF Image names are the containing folder name*
> > >    2. You must run this Batch in the Root folder for your ADFs (one
> level
> > >    up from the ADF files)
> > >    3. Paste/save the batch in the root folder
> > >    4. Open an instance of OSGeo4W Shell or its Linux counterpart
> navigate
> > >    to the root folder and run the script by typing *adf2tiff.bat*
> > >    5. It will start to write the Tiff files into the root folder.
> > >
> > > Hope this helps, or goes some way to helping.
> > > Regards
> > >
> > > Richard.
> > > --
> > > *Richard McDonnell*
> > > *GIS Specialist PgD GIS AssocSCSI*
> > >
> > > <http://www.opw.ie/>
> > >
> > >
> > > Email Disclaimer: http://www.opw.ie/en/disclaimer/
> > >
> > > _______________________________________________
> > > Qgis-user mailing list
> > > Qgis-user at lists.osgeo.org
> > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20171211/042b7d26/attachment.html>