[Qgis-user] Draw a polygon on a map, and retrieve it as a shapeFile

[Mustafa Elbehery]

Hi All,

I have tried to draw a Polygon on WebOpenStreetMap Layer, to retrieve it in
the end as Polygon, for testing my java application.

I have used a *addVector**Layer *menu, then select *polygon, *then draw the
polygon and save as shapeFile.

The problem is that I retrieved a *Multipolygon on the shapeFile, and *not
Polygon ..

Would like to know how to retrieve a polygon only, since I am interested in
the intersection points of other geometries, and PostGIS Function which do
this functionality, expecting only *Polygon. *
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Re: [Qgis-user] merged files generating "bad handles"

[Nicolas Cadieux]

Hey Buddy!

It helps if you give more info on the platform you are using (Windows, 
Linux disto...) the QGis version and the way you are accessing the GDAL 
merge.  That being said, if you are using the processing toolbox plugin 
to use this tool, it will, by default, save the results as a temporary 
file that is probably erased when you log off.  You need to specify the 
file name and the complete path to make sure you will keep the file.  
Once the file is loaded in Qgis, it will normally not have the name you 
gave it but will have a generic named like "merged.tiff". (The file name 
on the disk will be good).  Hover your mouse over the layer in the Layer 
Panel or look in the layer - properties - metadata - properties - Source 
for this layer, and you should find the complete path.

I normally reload the file so that the file name and layer name match.  
If you are using the Merge from the raster - misc - merge tool, make 
sure you click on the "Select" button so that you can save it in the 
right place.  If you just put the Output file name, I think the file is 
save in the last used directory but I am not sure.  If you still have 
problems, look at the gdal script
in the box.  That should also give you full path of the output file.  
Ultimately, you can cut and paste this script into the OSGeo command 
prompt and by-pass Qgis completely.  BTW, there is a limit to the number 
of files you can merge together.  If you have more that a hundred files 
to merge, I would make a virtual file than save that using gdal translate.

Hope this helps.

Nicolas
(Newfoundlander by heart!)

Cheers!

FWI, I have a Google + community called QGIS Canada.  There is not much 
going on there now but I would like to eventually use it for Canadian 
users looking for tip and data pertaining to Canadian data sets, 
research questions and problems. Please make it known to your students.  
The Qgis mail list, remains the best option for your current question.




Le 2016-02-17 03:18, rsweeny [via OSGeo.org] a écrit :
> Hi people
> When merging files I often get a working file that I am able to save,
> see and work with but when I reopen Qgis it reports that the files have
> bad handles and as I cannot locate where the file was saved to (despite
> various searches) I lose the work. Any suggestions on what I might be
> failing to do.
> thanks
> Robert
>
> -- 
> Robert C.H. Sweeny
> Professor of History
> Memorial University of Newfoundland
> St John's NL, A1C 5S7
> Canada
> 709-864-8440, 709-864-2164 (fax)
>
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Re: [Qgis-user] CentOS or SuSE for QGIS?

[Tudorache, Marian]

I am not sure if you are still looking into this matter.

What about this? 
http://courses.neteler.org/qgis-2-10-rpms-for-fedora-21-centos-7-scientific-linux-7/


-Original Message-
From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Evert 
Groenewald
Sent: January-17-16 2:39 PM
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] CentOS or SuSE for QGIS?

Hi Andreas

On 13/01/2016 13:40, Andreas Neumann wrote:
> Hi,
>
> At my new workplace I have the choice of CentOS or SuSE as a Linux
> distribution. I would have chosen Debian or Ubuntu, personally, but
> the other two are my choice.
>
You can look at the link below, it might help.
I do not know what the situation is in the CentOS repositories. On openSuse 
this is the choices from the Geo repository. Though I see CentOS 6 is listed as 
well.
http://download.opensuse.org/repositories/Application:/Geo/

Evert

> Which one is better for QGIS and FOSSGIS in general? What do you
> recommend? Or are they equally well suited?
>
> I intend to build from Source.
>
> Thanks,
> Andreas
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Re: [Qgis-user] PROBLEM IN RUNNING DEM

[Michael Treglia]

Hi Ashish,

Can you please elaborate on what you did? What tool were you using, and
exactly what was your goal? (Was it something through the processing
toolbox? Or the main functions in QGIS?)

These errors kind of look like what I've seen when I use SAGA GIS through
the processing toolbox and operations fail - I often find some SAGA
functions work best when I use SAGA as a stand-alone tool.  It should be
installed with QGIS (on Windows you should be able to find it by searching
in your start menu... not sure offhand about mac/linux systems).
Alternatively, you could download (a newer version of) SAGA and install
that on its own as well: http://www.saga-gis.org/en/index.html

Again though, giving more details will help others give some advice.
Cheers,
Mike

On Wed, Feb 17, 2016 at 9:42 AM, Ashish Guruji <
ashish.guruji-poly...@msubaroda.ac.in> wrote:

> SYSTEM:32 BIT
> VERSON QGIS:2.6.1
> INSTALLED:JANUARY 2016
> ​MESSAGE CAME IN QGIS​
>
> Oooops! The following output layers could not be open
>
> · Pit Removed Elevation Grid: 
> D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
> WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/pit_rmv.tif
>
> The above files could not be opened, which probably indicates that they
> were not correctly produced by the executed algorithm
>
> Checking the log information might help you see why those layers were not
> created as expected
>
>
>
>
>
> Oooops! The following output layers could not be open
>
> · D8 Flow Direction Grid: 
> D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
> WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/flow_drc.tif
>
> · D8 Slope Grid: 
> D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
> WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/flow_grid.tif
>
> The above files could not be opened, which probably indicates that they
> were not correctly produced by the executed algorithm
>
> Checking the log information might help you see why those layers were not
> created as expected
>
>
> IS THIS DUE TO LONG PATH OF FILE?
>
> --
> Ashish Laxman Guruji
> Lecturer & Internal Co-ordinator
> Civil & CDTP(Community Development Through Polytechnic)
> Polytechnic
> The M.S.University of Baroda
> Near Shashtri Bridge
> Fateh gunj
> Vadodara-390002
> Ph:91-9904222832
>
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[Qgis-user] PROBLEM IN RUNNING DEM

[Ashish Guruji]

SYSTEM:32 BIT
VERSON QGIS:2.6.1
INSTALLED:JANUARY 2016
​MESSAGE CAME IN QGIS​

Oooops! The following output layers could not be open

· Pit Removed Elevation Grid:
D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/pit_rmv.tif

The above files could not be opened, which probably indicates that they
were not correctly produced by the executed algorithm

Checking the log information might help you see why those layers were not
created as expected





Oooops! The following output layers could not be open

· D8 Flow Direction Grid:
D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/flow_drc.tif

· D8 Slope Grid:
D:/ashishgurujipolytechnic-20-6-14/ashishgurujipolytechnic-29-8-15/RESEARCH
WORK/MSU RESEARCH CELL/BHUVAN DATA/cdnf43t/flow_grid.tif

The above files could not be opened, which probably indicates that they
were not correctly produced by the executed algorithm

Checking the log information might help you see why those layers were not
created as expected


IS THIS DUE TO LONG PATH OF FILE?

-- 
Ashish Laxman Guruji
Lecturer & Internal Co-ordinator
Civil & CDTP(Community Development Through Polytechnic)
Polytechnic
The M.S.University of Baroda
Near Shashtri Bridge
Fateh gunj
Vadodara-390002
Ph:91-9904222832
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Re: [Qgis-user] Using PostgreSQL to store Lizmap Web Client accounts..

[Pietro Rossin]

Hello
I wrote on this issue post
https://github.com/3liz/lizmap-web-client/issues/238

Thanks
PIetro



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Re: [Qgis-user] custom string formatting for grid coordinate labels

[Neumann, Andreas]

 

That's an excellent idea - thanks for sharing! 

Andreas 

On 2016-02-17 10:42, Andrew Harfoot wrote: 

> Hi Uwe,
> 
> If you can't use formatting tags, then possibly Unicode is your friend here - 
> have a look at characters U1D31 and U1D3A - superscript E and N respectively. 
> Using these should allow you to generate labels like this: 0234ᴱ  or 345389ᴺ
> 
> Cheers,
> 
> Andy
> 
> On 16/02/2016 18:48, Nyall Dawson wrote: 
> 
>> On 17 Feb 2016 2:20 AM, "Uwe Fischer"  wrote:
>>> 
>>> Hello List, hello Nyall,
>>> 
>>> 
>>> 
>>> I have a question concerning the grid coordinate labels for map frames in 
>>> print composer. If you set the label format to „custom", you get to 
>>> „Expression based annotation" box where you can build expressions for 
>>> formatting, e.g. concat(left(@grid_number,3) ,  'E'). That works fine 
>>> in the editor and the footnote preview shows exactly the desired result (E 
>>> as an above positioned little index). But, in the map composer canvas, the 
>>> format string is rendered as text, that means E shows up as a text 
>>> string there.
>>> 
>>> 
>>> 
>>> Is there a way to apply the format rule (which seems to work) correctly to 
>>> the map composer? 
>> 
>> Not currently - there's no support for formatting in the coordinate text. 
>> 
>> Nyall 
>> 
>>> 
>>> 
>>> 
>>> Regards and thanks a lot,
>>> 
>>> 
>>> 
>>> Uwe
>>> 
>>> 
>> 
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> 
> -- 
> Andy Harfoot
> 
> GeoData Institute
> University of Southampton
> Southampton
> SO17 1BJ
> 
> Tel:  +44 (0)23 8059 2719
> Fax:  +44 (0)23 8059 2849
> 
> www.geodata.soton.ac.uk [1]
> 
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Links:
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Re: [Qgis-user] custom string formatting for grid coordinate labels

[Andrew Harfoot]

Hi Uwe,

If you can't use formatting tags, then possibly Unicode is your friend 
here - have a look at characters U1D31 and U1D3A - superscript E and N 
respectively. Using these should allow you to generate labels like this: 
0234ᴱ  or 345389ᴺ


Cheers,

Andy

On 16/02/2016 18:48, Nyall Dawson wrote:



On 17 Feb 2016 2:20 AM, "Uwe Fischer" > wrote:

>
> Hello List, hello Nyall,
>
>
>
> I have a question concerning the grid coordinate labels for map 
frames in print composer. If you set the label format to „custom“, you 
get to „Expression based annotation“ box where you can build 
expressions for formatting, e.g. concat(left(@grid_number,3) ,  
'E'). That works fine in the editor and the footnote preview 
shows exactly the desired result (E as an above positioned little 
index). But, in the map composer canvas, the format string is rendered 
as text, that means E shows up as a text string there.

>
>
>
> Is there a way to apply the format rule (which seems to work) 
correctly to the map composer?


Not currently - there's no support for formatting in the coordinate text.

Nyall

>
>
>
> Regards and thanks a lot,
>
>
>
> Uwe
>
>



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--
Andy Harfoot

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

Tel:  +44 (0)23 8059 2719
Fax:  +44 (0)23 8059 2849

www.geodata.soton.ac.uk

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[Qgis-user] GeoPython 2016 - the Python conference for the Geo-Community

[Christen Martin]

Dear QGIS users

I’m pleased to announce the upcoming GeoPython conference, which takes place in 
Basel, Switzerland June 22 to 24, 2016.

The conference is about Geo&Python and it would be great to have some 
talks/workshops from the QGIS community, deadline is March 10, 2016.

The event is organised by the University of Applied Sciences Northwestern 
Switzerland and PyBasel - the local Python User Group.


More info is available at http://www.geopython.net


Conference topics are:
- GIS / Mapping
- Geography / Geophysics / Geodesy / Geomatics
- Earth Sciences / Environmental Sciences
- Geovisualization
- Smart Cities
- Spatial Data / Geodata
- Geospatial Webservices
- Big Data
- Data Processing
- (Spatial) Databases
- Computer Vision
- Remote Sensing
- Image Processing
- Machine Learning
- Python in General



Kind regards,
Martin Christen


University of Applied Sciences and Arts
Northwestern Switzerland
Institute of Geomatics Engineering

 
Martin Christen
Gründenstrasse 40
4132 Muttenz

martin.chris...@fhnw.ch
www.fhnw.ch/habg/ivgi









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Re: [Qgis-user] Using PostgreSQL to store Lizmap Web Client accounts..

[Nicolas Boisteault]

Hi,

You should ask your question here : 
https://github.com/3liz/lizmap-web-client/issues


Nicolas BOISTEAULT
Développeur Web
Observatoire Régional de l'Environnement Poitou-Charentes
Téléport 4 Antarès - BP 50163 - 86962 Futuroscope Chasseneuil Cedex
Tél : 05 49 49 71 18
*Soyez Eco-responsable, n'imprimez que si nécessaire*
Le 12/02/2016 13:42, Rossin Pietro a écrit :


Hello

I’m not a Lizmap Web Client Guru but I’m trying to manage it in my 
organization.


I see version 3 is near to be published and I’m testing the Beta 3 one.

I am thinking to migrate the user logins and group roles from the 
jauth.db to a PostgreSQL database.


First of all, is it of any advantage to store these data into a 
postgresql db?


I figure it would be good as the number of users will rise and 
considering the opportunity to upgrade lizmap wc version frequently, 
as I saw any new version carry lot of improvements with it…


Anyway, assuming it is advantageous, how can I handle this process?

Shall I create the same tables and sequences as for jauth.db into a 
PostgreSQL schema and then edit profiles.ini.php with something like this?


[jdb:jauth]
driver=pdo
dsn="pgsql:host=myhost;dbname=mydb;port=5432"
user="myuser"
password="mypwd"

Thanks for any suggestion.

Pietro


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[Qgis-user] merged files generating "bad handles"

[rsweeny]

Hi people
When merging files I often get a working file that I am able to save, 
see and work with but when I reopen Qgis it reports that the files have 
bad handles and as I cannot locate where the file was saved to (despite 
various searches) I lose the work. Any suggestions on what I might be 
failing to do.

thanks
Robert

--
Robert C.H. Sweeny
Professor of History
Memorial University of Newfoundland
St John's NL, A1C 5S7
Canada
709-864-8440, 709-864-2164 (fax)

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