[Qgis-user] First steps with 3D Scan Data?

[Karl Magnus Jönsson]

Hi!
Lots of suggestions here. But if I understand you correct it is lidar data and all about photogrammetry is not in question. Why not pdal? Open source, powerful and what QGIS is using in 3.18.

https://pdal.io/

Karl-Magnus


-----Ursprungligt meddelande-----
Från: Qgis-user <qgis-user-bounces at lists.osgeo.org> För Bernd Vogelgesang
Skickat: den 26 mars 2021 09:35
Till: Benoit de Cabissole <benoit at geoproc.com>; qgis-user <qgis-user at lists.osgeo.org>
Ämne: Re: [Qgis-user] First steps with 3D Scan Data?

Hi Benoit,

ok, thanks. las then.

But when I read about the lastools plugin, the description says that I need to install the lastools software, and the website there tells me that the license is about 1500€ which is a little too much for some learning efforts.

Any other options?

Cheers,

Bernd


On 26.03.21 09:28, Benoit de Cabissole wrote:
> Hi Bernd,
>
> OK, that more info!
>
> The files are likely to be in Timble RealWorks format.
> So you will have to get your contractor to provide you with .las 
> files, otherwise your stuck buying RealWorks!
> Or, perhaps, the viewer is able to export in .las??
>
> When you get las files, you can use lastools plugin for QGIS to 
> process them.
>
> Cheers,
> Benoit
>
>
> On 26/03/2021 10:01, Bernd Vogelgesang wrote:
>> Hi Benoit,
>>
>> as I was not present when the scans were made, I can only assume that 
>> this was a laser scanner on a tripod.
>>
>> With the sent data, there is a Trimble Scan Explorer Viewer software 
>> where I can make a "virtual walk" through the scene, so there have to 
>> be photos but also laser scan data as I can see from different view modes.
>>
>> As I said, this is the very first time I get in touch with this 
>> stuff, and Google was of no big help so far.
>>
>> Besides of tons of other files, the bigger ones with around 50 to 80 
>> MB are .rwcx and .tzf files.
>> I hoped that someone would know what these file explicitly hold, and 
>> what I have to do to get them e.g. into QGIS or other open source 
>> software.
>>
>> Cheers,
>>
>> Bernd
>>
>> On 26.03.21 08:40, info wrote:
>>> Hi Bernd,
>>>
>>> Well, could you give more info? E.g. what kind of scan:
>>> laser/lidar/photo/other? This will influence your workflow.
>>>
>>> +/-Open source laser/lidar could be based on lastools [1]
>>> Open source photogrammetry could be based on AliceVision meshroom 
>>> [2,3],  MeshLab [4] and blender [5]
>>>
>>> In photogrammetry: Agisoft metashape [6] and pix4D [7] as good 
>>> commercial products.
>>>
>>> BTW: 32 scans, if photos, is quite a very low number of photos for 
>>> reconstructing a 3D scene!
>>>
>>> Hope this helps.
>>> Cheers,
>>> Benoit de Cabissole
>>>
>>> [1] http://lastools.org/
>>> [2] https://alicevision.org/#photogrammetry
>>> [3] https://github.com/alicevision/meshroom
>>> [4] https://www.meshlab.net/
>>> [5] https://www.blender.org/
>>> [6] https://www.agisoft.com/
>>> [7] https://www.pix4d.com/
>>>
>>>
>>>
>>> On 25/03/2021 23:07, Bernd Vogelgesang wrote:
>>>> Hi folks,
>>>>
>>>> in a project on a former dumpside now to be transformed into a sand 
>>>> lizard habitat, I saw the chance to get my hands dirty for the 
>>>> first time on 3D scan data (terrestrial). I received 10GB of stuff, 
>>>> and now I'm completely lost.
>>>>
>>>> The data consists of .rwcx files, .tzf files and lots of other stuff.
>>>>
>>>> Is there any chance that I can process any of this data with an 
>>>> open source stack?
>>>> Or what should be done, to make them digestible?
>>>>
>>>> Second step: There seem to be 32 different scans of the area form 
>>>> all angles. In case I succeed to somehow load the data, how do I 
>>>> combine them ?
>>>>
>>>> For the first steps, I actually "only" would like to generate a 
>>>> decent DEM from the data to be able to place some features on a map 
>>>> for the guys in charge to do the habitat stuff.
>>>>
>>>> Any kind of hints or links to reads about this topic would be 
>>>> appreciated
>>>>
>>>> Cheers,
>>>>
>>>> Bernd
>>>>
>>>>
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