[Qgis-user] LiDAR Data in QGIS

[Randal Hale]

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/
> > 
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