Re: [Qgis-user] Problems with profile from line altitude values + r.water.outlet command

[Micha Silver]

  
  
On 18/07/2012 01:28, Jaime Palalane
  wrote:

Regarding the explanation marked below in red, I tried
  several times to run the following command v.distance but always
  getting the error message "Not enough column names".
  
  
  v.distance from=Pxy@Lisboa
  from_layer=1 to=Proximo@Lisboa to_type=line to_layer=1
  upload=to_x,to_y,to_attr to_column=label column=lat
  output=Res3 dmax=-1 dmin=-1
  


The "column=" parameter needs to have the same number of columns as
the "upload=" parameter. So if you want to upload the to_x, to_y and
to_attr values you need to specify in which three columns to put
those values. Your columns parameter will look something like:
columns=x_coord,y_coord,lat

I also did not get any field to specify the column
  parameter to "outlet_x,outlet_y". I am running qgis on Linux.
  
  Jaime
  
  
  
  2012/7/13 Micha Silver 

  
 On 07/13/2012 04:02 PM, Jaime Palalane
  wrote:
  Dear qgis users,

I am trying to use qGIS to characterize a hydrographic
basin but I am facing problems with the profile from
line tool as it is giving an unique altitude value for
my rivers and lengths in grades. I would like to have
them in SI units. I would appreciate some tips in how to
solve this problem.

  
  

The units should be the units of the coordinate system. I
think that if you want altitudes and lengths in meters,
you'll have to project both the raster and the line features
to a projected CRS with meters as units.

  
  I am also trying to use the
r.water.outlet command to define a basin draining to a
specific point of a stream in raster format but without
success as it gives me back only one cell as the basin
and not a combination of cells which could form a real
basin. Any tutorial or video in how to use this command?

  
  

Perhaps the problem is that the outlet point must fall
exactly on a stream.  There's a trick using v.distance to
find a drainage point exactly on the stream, described here:

http://www.surfaces.co.il/?p=241

First add two columns to
  the streams layer: outlet_x, outlet_y. Now use v.distance
  with your outlet point as the "from" parameter, and the
  stream as the "to" parameter. Set the upload parameter to
  "to_x,to_y" and the column parameter to
  "outlet_x,outlet_y". Now after you run, you should get the
  X,Y coordinates of a point *on the stream* nearest to your
  planned outlet point. Use those coordinates in your
  r.water.outlet command, and you should get the full
  drainage area.

HTH,
Micha
 
Saudaçoes!
  
  Jaime
  
  This mail was received via Mail-SeCure System.
  
  
  
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-- 
Micha Silver
GIS Consultant, Arava Development Co.
http://www.surfaces.co.il
  

  
  
  
  
  -- 
  Jaime Palalane
  +258 82 70 56 990
  
  This mail was received via Mail-SeCure System.



-- 
Micha Silver
052-3665918

  

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Re: [Qgis-user] GEM-MT plugin

[Giuseppe Sucameli]

Hi Bob,

On Wed, Jul 18, 2012 at 12:04 AM, Bob and Deb  wrote:
> The reason why I ask, is because I have some ideas that might be useful to
> GEM-MT.

well, let's talk about your ideas or file tickets in the plugin
tracker [1] and I'll reply there. There're already some opened
ticket.

> Btw, you might find this VRT useful for GEM-MT:

sure!

I guess I'll publish a newer version tomorrow, I'm testing all the
stuff I added in the latest 2 days.

In the next version the user will able to use the plugin on any
loaded layer, not a CSV file only.

In addition, to improve performances, I'm working on importing
CSV file into a SL database.

Regards.

[1] http://hub.qgis.org/projects/gem-mt/issues

> 
> 
>
> CSV:/vsicurl/http://neic.usgs.gov/neis/gis/qed.asc
> wkbPoint
> WGS84
>  y="Latitude"/>
> 
> 
> 
> 
> 
> 
> 
> 
>
> On Tue, Jul 17, 2012 at 2:13 PM, Giuseppe Sucameli 
> wrote:
>>
>> Hi Bob,
>>
>> On Tue, Jul 17, 2012 at 10:31 PM, Bob and Deb  wrote:
>> > Can anyone tell me if the GEM Modellers Toolkit (GEM-MT) plugin is based
>> > on
>> > OpenGEM?  I would love to see a roadmap for GEM-MT :)
>>
>> the GEM-MT plugin is not based on OpenGEM.
>>
>> BTW, it is in a early development stage (it's an experimental
>> plugin), I'm working on it right now.
>>
>> There isn't a guide yet, but I added an howto into the README
>> file. In addition you could have a look at the plugin page on hub [1].
>>
>> Stay tuned.
>> Regards.
>>
>> [1] http://hub.qgis.org/projects/gem-mt/
>>
>> --
>> Giuseppe Sucameli - Faunalia
>
>



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Re: [Qgis-user] Problems with profile from line altitude values + r.water.outlet command

[Jaime Palalane]

Regarding the explanation marked below in red, I tried several times to run
the following command v.distance but always getting the error message "Not
enough column names".

 v.distance from=Pxy@Lisboa from_layer=1 to=Proximo@Lisboa to_type=line
to_layer=1 upload=to_x,to_y,to_attr to_column=label column=lat output=Res3
dmax=-1 dmin=-1

I also did not get any field to specify the column parameter to
"outlet_x,outlet_y". I am running qgis on Linux.

Jaime



2012/7/13 Micha Silver 

>  On 07/13/2012 04:02 PM, Jaime Palalane wrote:
>
> Dear qgis users,
>
> I am trying to use qGIS to characterize a hydrographic basin but I am
> facing problems with the profile from line tool as it is giving an unique
> altitude value for my rivers and lengths in grades. I would like to have
> them in SI units. I would appreciate some tips in how to solve this problem.
>
>
> The units should be the units of the coordinate system. I think that if
> you want altitudes and lengths in meters, you'll have to project both the
> raster and the line features to a projected CRS with meters as units.
>
>
> I am also trying to use the r.water.outlet command to define a basin
> draining to a specific point of a stream in raster format but without
> success as it gives me back only one cell as the basin and not a
> combination of cells which could form a real basin. Any tutorial or video
> in how to use this command?
>
>
> Perhaps the problem is that the outlet point must fall exactly on a
> stream.  There's a trick using v.distance to find a drainage point exactly
> on the stream, described here:
>
> http://www.surfaces.co.il/?p=241
>
> First add two columns to the streams layer: outlet_x, outlet_y. Now use
> v.distance with your outlet point as the "from" parameter, and the stream
> as the "to" parameter. Set the upload parameter to "to_x,to_y" and the
> column parameter to "outlet_x,outlet_y". Now after you run, you should get
> the X,Y coordinates of a point *on the stream* nearest to your planned
> outlet point. Use those coordinates in your r.water.outlet command, and you
> should get the full drainage area.
>
> HTH,
> Micha
>
>
> Saudaçoes!
>
> Jaime
>
> This mail was received via Mail-SeCure System.
>
>
> ___
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>
> This mail was received via Mail-SeCure System.
>
>
>
>
>
> --
> Micha Silver
> GIS Consultant, Arava Development Co.http://www.surfaces.co.il
>
>


-- 
Jaime Palalane
+258 82 70 56 990
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Re: [Qgis-user] GEM-MT plugin

[Bob and Deb]

Hi Guiseppe,

Thanks for the clarification.  So, what do you hope to do with your plugin?
 The reason why I ask, is because I have some ideas that might be useful to
GEM-MT.

Btw, you might find this VRT useful for GEM-MT:



CSV:/vsicurl/http://neic.usgs.gov/neis/gis/qed.asc

wkbPoint
WGS84










On Tue, Jul 17, 2012 at 2:13 PM, Giuseppe Sucameli wrote:

> Hi Bob,
>
> On Tue, Jul 17, 2012 at 10:31 PM, Bob and Deb  wrote:
> > Can anyone tell me if the GEM Modellers Toolkit (GEM-MT) plugin is based
> on
> > OpenGEM?  I would love to see a roadmap for GEM-MT :)
>
> the GEM-MT plugin is not based on OpenGEM.
>
> BTW, it is in a early development stage (it's an experimental
> plugin), I'm working on it right now.
>
> There isn't a guide yet, but I added an howto into the README
> file. In addition you could have a look at the plugin page on hub [1].
>
> Stay tuned.
> Regards.
>
> [1] http://hub.qgis.org/projects/gem-mt/
>
> --
> Giuseppe Sucameli - Faunalia
>
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Re: [Qgis-user] GEM-MT plugin

[Giuseppe Sucameli]

Hi Bob,

On Tue, Jul 17, 2012 at 10:31 PM, Bob and Deb  wrote:
> Can anyone tell me if the GEM Modellers Toolkit (GEM-MT) plugin is based on
> OpenGEM?  I would love to see a roadmap for GEM-MT :)

the GEM-MT plugin is not based on OpenGEM.

BTW, it is in a early development stage (it's an experimental
plugin), I'm working on it right now.

There isn't a guide yet, but I added an howto into the README
file. In addition you could have a look at the plugin page on hub [1].

Stay tuned.
Regards.

[1] http://hub.qgis.org/projects/gem-mt/

-- 
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[Qgis-user] GEM-MT plugin

[Bob and Deb]

Hello list,

Can anyone tell me if the GEM Modellers Toolkit (GEM-MT) plugin is based on
OpenGEM?  I would love to see a roadmap for GEM-MT :)

Bob
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Re: [Qgis-user] GPS Tools strange behavior

[Pedro Venâncio]

Hi,

I opened a ticket: http://hub.qgis.org/issues/6058 




Pedro







- Original Message -
From: Ken Norris 

As Micha copied in, i confirm similar behaviour for a Magellan 330M serial
machine connected via a USB adapter. It works reliably from the gpstools in
qgis only by avoiding the %in and %out operators thus:

%babel -w -i magellan,baud=115200 -o gpx -f /dev/ttyUSB0 -F
/home/ken/Downloads/waypoints.gpx

It works every time but the Layer name must be entered before the Save As
Output file name; doing the reverse hangs qgis. The save as file must be the
same as the file specified i.e. /home/ken/Downloads/waypoints.gpx.

It also works fine for tracks, changing w for t of course.

Clumsy but it works. Ubuntu 12.04 64bit

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Re: [Qgis-user] GPS Tools strange behavior

[Ken Norris]

As Micha copied in, i confirm similar behaviour for a Magellan 330M serial
machine connected via a USB adapter. It works reliably from the gpstools in
qgis only by avoiding the %in and %out operators thus:

%babel -w -i magellan,baud=115200 -o gpx -f /dev/ttyUSB0 -F
/home/ken/Downloads/waypoints.gpx

It works every time but the Layer name must be entered before the Save As
Output file name; doing the reverse hangs qgis. The save as file must be the
same as the file specified i.e. /home/ken/Downloads/waypoints.gpx.

It also works fine for tracks, changing w for t of course.

Clumsy but it works. Ubuntu 12.04 64bit

--
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Re: [Qgis-user] GPS Tools strange behavior

[Giovanni Manghi]

> Anyone confirm? Should I open a ticket?


I confirm,


I have a garmin 60cs and used to work just fine under Linux and now I
see that it behaves like you describe.

cheers

-- Giovanni --

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Re: [Qgis-user] PostGIS layers user access control from QGIS

[Giovanni Manghi]

> Just wondering if it is possible to control access to specific tables
> on PostGIS from QGIS. For example allow write access to specific
> layers on postGIS from QGIS?.

you do that by applying the proper permissions to PostgreSQL users.


cheers

-- Giovanni --

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Re: [Qgis-user] Getting landuse information for several circular polygons

[G. Allegri]

Hi Manuel,
I also suggest you to consider the analysis tools provided by Sextante [1].
It offers "bridges" to other GIS analysis software, like GRASS and SAGA,
and they have a lot of analysis functionalities and algorithms.
For example GRASS has the r.li.* [1 ]set of commamds for landscape analysis.

giovanni

[1] http://plugins.qgis.org/plugins/sextante/
[2] http://grass.fbk.eu/grass64/manuals/html64_user/r.li.html

2012/7/17 Manuel Spínola 

> Thank you very much Simon.
>
> No offense at all, by the contrary, very helpful and very grateful for
> your message.
>
> I will check all the stuff you suggested.
>
> I teach landscape ecology and wildlife habitat evaluation for master
> students, I use R for some topics, but I want use more QGIS and stay away
> from commercial software.  Our students (from all over Latin America)
> usually work under very restrictive budgets.
>
> Best,
>
> Manuel
>
>
> 2012/7/16 Simon Cropper 
>
>> Manuel,
>>
>> I am not aware of any specific tutorials for doing this work in QGIS.
>>
>> No offense but these tasks are relatively basic. Your comment "I found
>> this task kind of difficult to do in QGIS" is suggestive that you have
>> difficulty in either basic GIS concepts or extrapolating your existing
>> knowledge from a commercial package to QGIS.
>>
>> *Assuming you stick with QGIS*
>>
>> Micha Silver has provided a tutorial called "GIS basics with Quantum GIS"
>> http://www.osgeo.org/node/1058 that may help you master the basics.
>>
>> The QGIS website has a great section called "How do I do that in QGIS?"
>> that covers alot of material http://hub.qgis.org/projects/**
>> quantum-gis/wiki/How_do_I_do_**that_in_QGIS#How-do-I-do-that-**in-QGIS.
>> Note the large number of videos on youtube -- sometimes seeing it done can
>> help.
>>
>> *Assuming you are considering an alternative*
>>
>> The OSGeo Educational Content Inventory also has a wide variety of other
>> educational material available that might also help fill in the gaps.
>> http://www.osgeo.org/**educational_content
>>
>> Finally, QGIS is not the only fosGIS out there. Check out what is on
>> offer on the LiveDVD 
>> (http://wiki.osgeo.org/wiki/**Live_GIS_Disc
>> ).
>>
>> Personally, I found using gvSIG relatively easy when moving from ArcView.
>> Unfortunately the bulk of the tutorials are in Spanish; unlike QGIS which
>> are predominantly in English. See my website for details and a list of
>> ecological tutorials I have prepared to date.
>>
>> *Final Comment*
>>
>> All this material is predicated by the premise that you actually know
>> what things are called. Reprojection and transformation is a good example.
>> Projection, SRS and CRS another. When stuck, posing a problem on the forums
>> can help as others can help you with terminology and suggest methods to
>> solve you problems.
>>
>> I hope this helps.
>>
>>
>> On 17/07/12 11:50, Manuel Spínola wrote:
>>
>>> What I am trying to do is a very common task in landscape ecology.  The
>>> buffer could be considered a landscape for some species and some metrics
>>> could be obtained for these "landscapes", however, I found this task
>>> kind of difficult to do in QGIS.  Any input on this?  Is there any
>>> oriented landscape ecology tutorial for QGIS.
>>>
>>
>>
>> [snip]
>>
>>
>> --
>> Cheers Simon
>>
>>Simon Cropper - Open Content Creator
>>
>>Free and Open Source Software Workflow Guides
>>--**--
>>Introduction   
>> http://www.fossworkflowguides.**com
>>GIS Packages   
>> http://www.fossworkflowguides.**com/gis
>>bash / Python
>> http://www.fossworkflowguides.**com/scripting
>>
>>
>>
>
>
> --
> *Manuel Spínola, Ph.D.*
> Instituto Internacional en Conservación y Manejo de Vida Silvestre
> Universidad Nacional
> Apartado 1350-3000
> Heredia
> COSTA RICA
> mspin...@una.ac.cr
> mspinol...@gmail.com
> Teléfono: (506) 2277-3598
> Fax: (506) 2237-7036
> Personal website: Lobito de río
> Institutional website: ICOMVIS 
>
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[Qgis-user] Hello,

[gilad kozokaro]

I want to create dynamic diagrams will change I change the source data, Is
there a possibility that i can create, edit or analyze schema like ArcGIS
Diagrammer in QGIS ?
Thanks,
Gilad


-- 
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Air Modeling
Tel:+972-52-6961227
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