[Qgis-user] LAStools on Mac Catalina --- LAS -> LAZ

[Maria Shinoto]

Hi, 

I have to shrink 9 larger LiDAR data sets with LAStools to LAZ. 

Now I am working on a Mac (Intel; Catalina) and do not know how I should get 
LAStools, the zip-command in particular, running.

With web search I only find entries that are 7 or so years old, and I am not 
sure, whether these tips still works. 

I use the Terminal on Mac, have Parallels with Windows 10 installed and could 
try it that way as well. Or is there a solution with QGIS? (I am preparing an 
upgrade from 3.12 to 3.20)

Thanks a lot, 
Maria

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[Qgis-user] QT Deisgner - error on path

[Dario C]

Hi,
if I launch QT Disegner and I press Help>QT designer Help I receive an
error message because it does not find assistance.exe
[image: image.png]
you can see that there is an error on "...\bin/bin..." folder.

If I try to launch assistant.exe manually I have an other error message:
[image: image.png]
it does not find libpng.

How can I fix this? I've already installed the software.

Thank you
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Re: [Qgis-user] Axes

[Charles Dixon-Paver]

Hi there,

I think it may be a bit unclear exactly what your objective is. Perhaps
attaching an illustration of some sort would help the community better
understand the problem so that we can assist with a solution.

Regards

On Thu, 26 Aug 2021 at 02:06, Marcio Midon  wrote:

> Hello colleagues,
>
> I need to generate in QGIS street axes from a block face and that these
> axes cross for two meters.
>
> It's possible?
> Best regards,
>
> *Márcio Midon*
> Arquiteto e Urbanista UFPel
> Especialista Geoprocessamento UFPR
> Mestre Geomática UFSM
> Doutorando Geografia UFSM
> Tel 53 3305 7075 | Cel 53 98100 2020
> SKYPE marcio_midon
>
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Re: [Qgis-user] PyGQIS output a layer? v3.16

[Andrew Hughes]

Hi All,

Thanks for your help. I made some progress, in that a downstream script can
call this one and can access the output layer.

The weird thing is, when I run the script from the QGIS Processing panel,
or try and use it within a model. Neither will detect that the script has
any output.

I am declaring the output here:
https://github.com/ahhughes/pyqgisorama/blob/main/CreateArcGISFeatureLayer.py#L115

and I am setting the output value here:
https://github.com/ahhughes/pyqgisorama/blob/main/CreateArcGISFeatureLayer.py#L146

However it doesn't show up as described above, yet the input does showup...
https://github.com/ahhughes/pyqgisorama/blob/main/CreateArcGISFeatureLayer.py#L106

Any help would be appreciated

Thanks in advance
Andrew


On Wed, 25 Aug 2021 at 21:27, Etienne Trimaille 
wrote:

> A QgsProcessingOutputVectorLayer will understand you are returning a
> QgsVectorLayer.
>
> Maybe I'm wrong, but it works well :
>
> https://github.com/3liz/QuickOSM/blob/master/QuickOSM/quick_osm_processing/advanced/open_osm_file.py#L130..L158
>
> Le mer. 25 août 2021 à 11:59, Richard Duivenvoorde 
> a écrit :
>
>> On 8/25/21 8:43 AM, Etienne Trimaille wrote:
>> > You can output a QgsVectorLayer :
>> https://qgis.org/api/classQgsProcessingOutputVectorLayer.html <
>> https://qgis.org/api/classQgsProcessingOutputVectorLayer.html>
>> > The sink is not required and you would avoid a loop to insert all
>> features.
>> >
>> > I think you should also return sink ID or layer ID, not the object
>> itself.
>>
>> Hi Etienne,
>>
>> But the code of Andrew would receive features from a ArcGis feature
>> server.
>> How would you instruct QgsProcessingOutputVectorLayer to use that
>> provider?
>> QgsProcessing::SourceType shows (to me) only general types?
>>
>> Or is there some way to use it as a wrapper around a real layer?
>>
>> Regards,
>>
>> Richard Duivenvoorde
>>
>
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Re: [Qgis-user] LAStools on Mac Catalina --- LAS -> LAZ

[Nicolas Cadieux]

Hi,
Lastools, to my knowledge is pc based. Laszip, according to this page, can be 
complied for Mac https://laszip.org/.  

The latest version of QGIS supports Lidar and I know that the OSGEO4W does 
install the pdal library. PDAL contains many lastools like functions with the 
added bonus of being OpenSource.  I expect that this would also be installed 
with the Mac QGIS installer.  If you install 3.20 on Windows, make sure you 
make a fresh install using the latest installer.  You cannot update a old 
installation in an existing folder.

Sorry for not being too precise, I have not yet played with the new Lidar tools.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 26 août 2021 à 06:29, Maria Shinoto  
> a écrit :
> 
> Hi, 
> 
> I have to shrink 9 larger LiDAR data sets with LAStools to LAZ. 
> 
> Now I am working on a Mac (Intel; Catalina) and do not know how I should get 
> LAStools, the zip-command in particular, running.
> 
> With web search I only find entries that are 7 or so years old, and I am not 
> sure, whether these tips still works. 
> 
> I use the Terminal on Mac, have Parallels with Windows 10 installed and could 
> try it that way as well. Or is there a solution with QGIS? (I am preparing an 
> upgrade from 3.12 to 3.20)
> 
> Thanks a lot, 
> Maria
> 
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Re: [Qgis-user] New User Help

[Hugh Kelley]

Hi Grant, interesting project.

Do you currently have a feed of railcar location data and are simply
looking to visualize it or would you need a way to collect live locations
or track some other way?



On Wed, Aug 25, 2021, 1:58 PM Grant Olmschenk 
wrote:

> I am a new user of this program and am in need of some guidance or
> possibly some programs that would integrate well with QGIS. I work for a
> plastic services company and most of our inventory is stored in rail cars
> on site or within a 3 mile area of the facility. I am looking to have an
> interactive map of our rail car inventory.
> Is this a feasible idea that could be done using QGIS?
>
> Any help would be appreciated
>
> --
> *Grant Olmschenk*
> Supply Chain Coordinator/Rail Quality Assurance
>  201 W 86th St. Bloomington, MN. 55420
> *Office Phone**:* 1-800-227-4156 ext: 6300
> *Email:* grant.olmsch...@brunkus.com
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Re: [Qgis-user] Axes

[Marcio Midon]

hi Charles,

It's something like this:

https://support.esri.com/en/technical-article/12414

But i just work with QGIS and Linux,

Thanks for all,

Best Regards,

Marcio Midon.

Em 26/08/2021 08:44, Charles Dixon-Paver escreveu:

Hi there,

I think it may be a bit unclear exactly what your objective is. 
Perhaps attaching an illustration of some sort would help the 
community better understand the problem so that we can assist with a 
solution.


Regards

On Thu, 26 Aug 2021 at 02:06, Marcio Midon > wrote:


Hello colleagues,

I need to generate in QGIS street axes from a block face and that
these axes cross for two meters.

It's possible?

Best regards,

*Márcio Midon*Arquiteto e Urbanista UFPel Especialista
Geoprocessamento UFPR Mestre Geomática UFSM Doutorando Geografia
UFSM Tel 53 3305 7075 | Cel 53 98100 2020 SKYPE marcio_midon

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--


--
Matrícula Aluno Especial
Cordialmente,

*Márcio Midon*Arquiteto e Urbanista UFPel Especialista Geoprocessamento 
UFPR Mestre Geomática UFSM Doutorando Geografia UFSM Tel 53 3305 7075 | 
Cel 53 98100 2020 SKYPE marcio_midon


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Re: [Qgis-user] Axes

[Charles Dixon-Paver]

I think the best approach will greatly depend on your input data structure
and situation, but I should think it certainly is possible.

In the processing toolbox, there is a GRASS tool called v.voronoi.skeleton
which is pretty effective at producing single centerlines from polygons. If
what you want is not achievable with a single tool, the modeler will allow
you to chain processing steps to achieve that outcome, likely in a much
more effective manner than in the article you linked to. There may also be
community built processing models available on GitHub or GIS stack
exchange which might already do this for you. We are hoping to get more
solutions on the https://plugins.qgis.org/models/ platform so that this
type of content is more discoverable in future.

I hope that's at least enough to help you get started.

Regards

On Thu, 26 Aug 2021 at 19:05, Marcio Midon  wrote:

> hi Charles,
>
> It's something like this:
>
> https://support.esri.com/en/technical-article/12414
>
> But i just work with QGIS and Linux,
>
> Thanks for all,
>
> Best Regards,
>
> Marcio Midon.
> Em 26/08/2021 08:44, Charles Dixon-Paver escreveu:
>
> Hi there,
>
> I think it may be a bit unclear exactly what your objective is. Perhaps
> attaching an illustration of some sort would help the community better
> understand the problem so that we can assist with a solution.
>
> Regards
>
> On Thu, 26 Aug 2021 at 02:06, Marcio Midon  wrote:
>
>> Hello colleagues,
>>
>> I need to generate in QGIS street axes from a block face and that these
>> axes cross for two meters.
>>
>> It's possible?
>> Best regards,
>>
>> *Márcio Midon*
>> Arquiteto e Urbanista UFPel
>> Especialista Geoprocessamento UFPR
>> Mestre Geomática UFSM
>> Doutorando Geografia UFSM
>> Tel 53 3305 7075 | Cel 53 98100 2020
>> SKYPE marcio_midon
>>
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>>
> --
>
>
> --
> Cordialmente,
>
> *Márcio Midon*
> Arquiteto e Urbanista UFPel
> Especialista Geoprocessamento UFPR
> Mestre Geomática UFSM
> Doutorando Geografia UFSM
> Tel 53 3305 7075 | Cel 53 98100 2020
> SKYPE marcio_midon
>
>
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[Qgis-user] ERROR 1: Wrong field type for fid in v.clean

[Nicolas Cadieux]

Hi,

I am working on a model and I am adding a fid field to a file using the 
field calculator.  I add an "int" field use the $id expression and all 
is good (fid field is int64). When I pass this file to v.clean (Grass), 
I get *ERROR 1: Wrong field type for fid*.  I can only proceed if I 
delete the previously created fid field. The funny thing is that the 
output from GRASS has a Int64 fid so my input fid should be accepted.  
The field is unique so that is not the problem either.  Same problem 
outside of the model.  Any ideas how to fix this?


Nicolas


--
Nicolas Cadieux
https://gitlab.com/njacadieux

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