Re: [Qgis-user] 1 band raster colormap

[benoit-3]

On 15.08.2012 08:51, Andre Joost wrote:

Am 15.08.12 07:22, schrieb Matt Boyd:

Hi Group,
I'm working with some grid data (imported using the zmap format,
effectively 1 band rasters). While the psuedocolor and freakout
options are okay, they don't provide the level of control I would 
like
over the colormap and using the colormap option with more than a 
dozen

or so colours is somewhat time consuming.

Does anyone know of an easy/quick way to create colormaps in/for 
QGIS?




You know the plugin for that?
http://www.bc-consult.com/free/bcccoltbl1.html
You have to enable experimental plugins and add the repository
http://www.bc-consult.com/free/plugins.xml
manually.


Please be aware that the plugin does not work with 'QGIS Dev' (1.9.x).
It is fine to use up to QGIS 1.8 (current stable version) and will be 
superseded by Etienne's work from QGIS 1.9.

Thanks,
Benoit




Greetings,
André Joost

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Re: [Qgis-user] Do you use the MemoryLayerSaver plugin?

[Chris Crook]

Hi Paolo

Yes, I was thinking of the python bindings - the alternative would be to use 
the OGR driver, but I couldn't see a way to put more than one layer into a 
database file (at least not using QgsVectorFileWriter).

Cheers
Chris

From: Paolo Cavallini [cavall...@faunalia.it]
Sent: 15 August 2012 17:30
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Do you use the MemoryLayerSaver plugin?

Il 14/08/2012 23:14, Chris Crook ha scritto:
I will upload an experimental version 2.0 of the plugin which implements this 
to plugins.qgis.org

I have considered another format, which is an SQLite database.  However this 
creates another set of issues in mapping layers, data types, etc to SQLite 
formats and back again.  I probably would not use spatialite, as this would add 
another dependency on the Memory Layer

do you mean the spatialite python bindings?
all the best.

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Re: [Qgis-user] QGis crashes when loading unprojecter layer

[zbynek]

Thanks for all efforts, I will try this and reinstall Osgeo4w if necessary.

Zbynek



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[Qgis-user] random locations sample from the actual map

[chathura silva]

hi friends,

How can I choose or extract a random area (for the moment suppose within a
range of co-ordinates) from a  map. can we make that selected area as a
separate map ?.
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[Qgis-user] problems making grass training map via qgis

[Samantha Goodchild-Brown]

Can anyone tell me how to make a training map for supervised 
classification using QGIS Grass (1.8).


I have successfully made the polygons with label attributes (as a grass 
vector layer - attribute table now looks the same as the sample datasets 
from installation) but these attributes are lost when converting to 
raster. Hence my raster comes out as one cell (one value to region extents).


If I use Grass GUI (6.4.2) to convert a vector polygon to a raster, 
georeferencing gets lost.


Are these known bugs? can someone give me a workaround? Or fix my 
methodology if I am making common dingbat errors.


Thanks
Sam
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[Qgis-user] Accessing an Oracle database, natively or through ArcSDE

[Jonathan Moules]

Hi List,
I'm investigating QGIS as a possible suplement to our corporate systems
(ArcGIS/MapInfo). We store all of our vector data in an Oracle Locator
database and can either connect to it directly or through ArcSDE.
Unfortunately it doesn't seem that QGIS is able to natively connect to
either of these.

I've done some brief searching, but most of the results point to
qgis.orgwhich isn't responding for me currently. What I can find
suggests that most
things want to go either either OGR or GDAL as an intermediary layer, but
I'm concerned these will greatly slow down data loading (some of our layers
are very big, including Ordnance Survey MasterMap).

So my question is simple - what would be the optimal way for QGIS to read
this data (we're not interested in writing)?

Thanks,
Jonathan


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Re: [Qgis-user] Checkbox missing in WFS Client

[Marco Hugentobler]

Hi Katharina

From 1.8 on, there is a checkbox 'check features' in the WFS dialog. If 
you zoom to the desired view and uncheck the box, the WFS only downloads 
the view extent (plus it reloads the required features if you zoom out 
of that extent).
If you don't want the WFS client to reload when zooming out of the 
extent, you might specify a BBOX filter: double click on the 'Filter' 
column in the dialog and enter the filter xml in quotes.


Regards,
Marco


Am 14.08.2012 15:13, schrieb Katharina Lange:

Hello!

In my WFS Client not is shown the checkbox: Only request features 
overlapping the current view


What is the problem? What can i do to solve it?

Thanks!


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Re: [Qgis-user] problems making grass training map via qgis

[Micha Silver]

  
  
On 15/08/2012 11:17, Samantha
  Goodchild-Brown wrote:

Can
  anyone tell me how to make a training map for supervised
  classification using QGIS Grass (1.8).
  
  
  I have successfully made the polygons with label attributes (as a
  grass vector layer - attribute table now looks the same as the
  sample datasets from installation) but these attributes are lost
  when converting to raster. Hence my raster comes out as one cell
  (one value to region extents).
  
  


You should be getting a raster with different cat values for each of
the input vector categories.  In the GRASS toolbox is the module
v.to.rast.attr which takes a numeric column in the vector attrib
table to be used as the new raster categories. The full options for
v.to.rast (not available in the QGIS GRASS plugin, only in GRASS
itslef) include a parameter "labelcol=" to give the resulting raster
categories a text label in addition to the numeric cat value.  

Also be sure to run g.region vect=
before converting.

 
If
  I use Grass GUI (6.4.2) to convert a vector polygon to a raster,
  georeferencing gets lost.
  
  

That should certainly not be happening. What do you get from v.info
on the input vector, and r.info on that output raster?

Are
  these known bugs? can someone give me a workaround? Or fix my
  methodology if I am making common dingbat errors.
  
  
  Thanks
  
  Sam
  
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[Qgis-user] split features

[michael chiverton]

Hi qgisers,

When digitizing in qgis, how is the split features option utilized.
everytime i try to split my features (similar to cut polygons in arcgis) i
get nothing.  it doesnt split the feature.  is there some trick to this
that i am missing?

thanks,


mike
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Re: [Qgis-user] split features

[Andreas Neumann]

Hi,

How did you split? You have to draw a split line with at least two 
points that actually crosses one or more polygons or lines.


The other question: do you use a recent build of QGIS?

Andreas

On Wed, 15 Aug 2012 04:19:04 -0700, michael chiverton wrote:

Hi qgisers,
 
When digitizing in qgis, how is the split features option utilized. 
everytime i try to split my features (similar to cut polygons in
arcgis) i get nothing.  it doesnt split the feature.  is there some
trick to this that i am missing? 
 
thanks,
 
 
mike


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Re: [Qgis-user] split features

[Andre Joost]

Am 15.08.12 13:19, schrieb michael chiverton:

Hi qgisers,

When digitizing in qgis, how is the split features option utilized.
everytime i try to split my features (similar to cut polygons in arcgis) i
get nothing.  it doesnt split the feature.  is there some trick to this
that i am missing?



The layer has to be in editing mode, and you have to right-click to end 
the separating line.


HTH,
André Joost

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Re: [Qgis-user] random locations sample from the actual map

[richard burcher]

Hi Chathura,

For vector data try the fTools. Look under Vector -- Research Tools, there
are several ie Random Selection & Random Selection within subsets. This
would do for selecting already present polygon/point type features & export
selected layer from table of contents as a new layer.

To select only a range of coordinates (point based data) you can add the x &
y columns to attribute table. select layer for edit, add column of type real
(remember to set precision to > 2) & from Geometry group in Function list
window select $x or $y. Save & stop editing, you may notice that the columns
go null -- this is a bug (i'm using 1.8 windows 7), close & reopen attribute
table. You can now use the query builder to filter out a range of values,
export selection & apply the fTools discussed above. 

For more advanced options I would look at the mangeR plugin.

Plugins of interest:
Point Sampling tool
Spatial Data Analysis for point pattern -- very extensive functionality


Cheers,

Richard



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[Qgis-user] Transparency for vector layer

[Jonathan Moules]

Hi,
I know you get set a vector layer's transparency if it is symbolised using
a "single Symbol", however I can't seem to find any way to make
"Categorized" or "Graduated" styled layers transparent. Is this possible?
Thanks, Jonathan


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Re: [Qgis-user] problems making grass training map via qgis

[richard burcher]

Another option is to create training polygons & use [1] SAGA for the
supervised classification (either standalone or through the Sextante
plugin). I've recently gone this way for a maximum likelihood
classification.

[1] http://www.saga-gis.org/en/index.html

Cheers,

Richard



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Re: [Qgis-user] Transparency for vector layer

[Giovanni Manghi]

Select the classes and then right click to get a dialog that includes the
transparency option. The overall transparency slider is missing, but there
is a feature request already filed.
On Aug 15, 2012 2:44 PM, "Jonathan Moules" <
jonathanmou...@warwickshire.gov.uk> wrote:

> Hi,
> I know you get set a vector layer's transparency if it is symbolised using
> a "single Symbol", however I can't seem to find any way to make
> "Categorized" or "Graduated" styled layers transparent. Is this possible?
> Thanks, Jonathan
>
>
> This transmission is intended for the named addressee(s) only and may
> contain sensitive or protectively marked material up to RESTRICTED and
> should be handled accordingly. Unless you are the named addressee (or
> authorised to receive it for the addressee) you may not copy or use it, or
> disclose it to anyone else. If you have received this transmission in error
> please notify the sender immediately. All email traffic sent to or from us,
> including without limitation all GCSX traffic, may be subject to recording
> and/or monitoring in accordance with relevant legislation.
>
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Re: [Qgis-user] Transparency for vector layer

[richard burcher]

Hi Jonathan,

There is no global (from what i see) setting for transparency to be applied
to each category. 

I've tried the following: (win 7 qgis 1.8)
1) categorize a polygon layer by some unique id -- classifiy
2) right click each symbol color for context menu

Context menu provides option for transparency for that symbol.

Cheers,

Richard






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Re: [Qgis-user] split features

[skampus]

this thread comes properly.
as you said, in order to split a features you have to CROSS the element.
if you have a polygon to be splitted at vertices, i don't understand why you
have to cross it. if you set properly snapping, it's simple to draw
splitting segment that snap perfectly to vertices of polygon.
what do you think?




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Re: [Qgis-user] Transparency for vector layer

[maning sambale]

+1 on including the global transparency in the new vector symbology/style.
It is actually one of my personal killer feature when I discovered QGIS*.

* If arcview 3.2a is the only software you used before qgis, you know what
I mean. :-)

Maning Sambale
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Re: [Qgis-user] problems making grass training map via qgis

[Micha Silver]

  
  
On 08/15/2012 03:40 PM, Samantha Goodchild-Brown wrote:

  
  On 2012/08/15 12:40, Micha Silver wrote:
  


On 15/08/2012 11:17, Samantha
  Goodchild-Brown wrote:

Can anyone tell me how to make a training map for
  supervised classification using QGIS Grass (1.8). 
  
  I have successfully made the polygons with label attributes
  (as a grass vector layer - attribute table now looks the same
  as the sample datasets from installation) but these attributes
  are lost when converting to raster. Hence my raster comes out
  as one cell (one value to region extents). 
  


You should be getting a raster with different cat values for
each of the input vector categories. 
  
  Yes
  
In the GRASS toolbox is the module v.to.rast.attr which takes a
numeric column in the vector attrib table to be used as the new
raster categories. 
  yes
  The

full options for v.to.rast (not available in the QGIS GRASS
plugin, only in GRASS itslef)
  Ah, confirmation! I was thinking to go to linux - any comments on
  which is the better to use? 

You should be able to work with GRASS on Linux, Mac and Windows
pretty much equally well. Moving to Linux is probably a good move in
general, although off topic for this list. But I would suggest to
have a look at the OSGeo LiveDVD which is based on Xubuntu and has
just about all the Open Source GIS stuff available today
pre-installed. You can try it out from the LiveDVD, run it in a
Virtual Machine, making the migration to Linux easier, or just go
ahead and install it.
 

  
include a parameter "labelcol=" to give the resulting raster
categories a text label in addition to the numeric cat value.  

Also be sure to run g.region vect= before converting.
  
  This is new, thanks. This could be a missing link.
   
 
If I use Grass GUI (6.4.2) to convert a vector
  polygon to a raster, georeferencing gets lost. 
  

That should certainly not be happening. What do you get from
v.info on the input vector, and r.info on that output raster?
  
  In the process (with this interface) it does complain about a
  colours column that it needs extra - have tried a few different
  methods there.
  Indicates it made it sucessfully but 'couldn't resolve the colour
  table issue' (with everything I have tried) - then when you zoom
  to that layer you are at the CM's and of course - no colours. But
  I didn't know about g.region.vect. 

I don't know why the color table issue comes up, but it shouldn't
interfere with creation of the raster. Did you have a look at r.info
and v.info?


  
Are these known bugs? can someone give me a
  workaround? Or fix my methodology if I am making common
  dingbat errors. 
  
  Thanks 
  Sam 
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Re: [Qgis-user] Transparency for vector layer

[Jonathan Moules]

Hi Both,
Thanks for the responses, that clears that up. Good to know there's already
a feature request for it, save me having to create a new one. ;-)
Jonathan



On 15 August 2012 14:54, richard burcher  wrote:

> Hi Jonathan,
>
> There is no global (from what i see) setting for transparency to be applied
> to each category.
>
> I've tried the following: (win 7 qgis 1.8)
> 1) categorize a polygon layer by some unique id -- classifiy
> 2) right click each symbol color for context menu
>
> Context menu provides option for transparency for that symbol.
>
> Cheers,
>
> Richard
>
>
>
>
>
>
> --
> View this message in context:
> http://osgeo-org.1560.n6.nabble.com/Transparency-for-vector-layer-tp4995386p4995394.html
> Sent from the Quantum GIS - User mailing list archive at Nabble.com.
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Re: [Qgis-user] split features

[Andreas Neumann]

Hi,

I believe that the QGIS split function requires the crossing, even if 
snapping is perfect. You can snap and CROSS at the same time. No 
problem.


Did you try it?

Andreas

On Wed, 15 Aug 2012 06:56:44 -0700 (PDT), skampus wrote:

this thread comes properly.
as you said, in order to split a features you have to CROSS the 
element.
if you have a polygon to be splitted at vertices, i don't understand 
why you

have to cross it. if you set properly snapping, it's simple to draw
splitting segment that snap perfectly to vertices of polygon.
what do you think?




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Re: [Qgis-user] image boundary

[Ivan Mincik]

On Tue, 2012-08-14 at 19:15 -0700, skampus wrote:
> thanks to giovanni manghi who told me to use tileindex module of gdal in the
> raster menu.
> great! all it works so i have my brand new shapefile having the path each
> photo as attribute of each polygon.
> 
> now i'd like to add an action in order to add the image to TOC. 
> what is the qgis internal function to use as an action to add raster image
> to toc?

Do You know that You can use 'gdalbuildvrt' command to create virtual
raster layer containing all your raster files and load it as one layer.
Than files matching your viewport will be automatically loaded by
demand.



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Re: [Qgis-user] problems making grass training map via qgis

[Samantha Goodchild-Brown]

On 2012/08/15 12:40, Micha Silver wrote:

On 15/08/2012 11:17, Samantha Goodchild-Brown wrote:
Can anyone tell me how to make a training map for supervised 
classification using QGIS Grass (1.8).


I have successfully made the polygons with label attributes (as a 
grass vector layer - attribute table now looks the same as the sample 
datasets from installation) but these attributes are lost when 
converting to raster. Hence my raster comes out as one cell (one 
value to region extents).




You should be getting a raster with different cat values for each of 
the input vector categories.

Yes
In the GRASS toolbox is the module v.to.rast.attr which takes a 
numeric column in the vector attrib table to be used as the new raster 
categories. 

yes
The full options for v.to.rast (not available in the QGIS GRASS 
plugin, only in GRASS itslef)
Ah, confirmation! I was thinking to go to linux - any comments on which 
is the better to use?
include a parameter "labelcol=" to give the resulting raster 
categories a text label in addition to the numeric cat value.


Also be sure to run g.region vect= before 
converting.

This is new, thanks. This could be a missing link.



If I use Grass GUI (6.4.2) to convert a vector polygon to a raster, 
georeferencing gets lost.


That should certainly not be happening. What do you get from v.info on 
the input vector, and r.info on that output raster?
In the process (with this interface) it does complain about a colours 
column that it needs extra - have tried a few different methods there.
Indicates it made it sucessfully but 'couldn't resolve the colour table 
issue' (with everything I have tried) - then when you zoom to that layer 
you are at the CM's and of course - no colours. But I didn't know about 
g.region.vect.
Are these known bugs? can someone give me a workaround? Or fix my 
methodology if I am making common dingbat errors.


Thanks
Sam
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--
Micha Silver
052-3665918


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Re: [Qgis-user] problems making grass training map via qgis

[Paolo Cavallini]

Il 15/08/2012 12:40, Micha Silver ha scritto:
> The full options for v.to.rast (not available in the QGIS GRASS
> plugin, only in GRASS itslef) include a parameter "labelcol=" to give
> the resulting raster categories a text label in addition to the
> numeric cat value. 
Hi.
You can use the full GRASS CLI also within QGIS.
If you need additional options, please open a ticket on QGIS trac, or
better make a patch yourself (it is simple), and I'll apply it.
Thanks.

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[Qgis-user] sobre vector resumen

[Eduardo Arévalo]

Buenas Tardes tengo una consulta creo que es un poco compleja y espero que
me deje entender:

Hay alguna forma de ejecutar el siguiente análisis con las herramientas que
se dispone el qgis 1.8?

1) Tengo 12 vectores (1 por mes) de las areas sembradas por regiones.

mes 1
| región | área sembrada1 |

mes 2
| región | área sembrada2|

..
..
..

2) Como puedo obtener un vector resumen

mes1 + mes2= mes total

Mes total

| región | area sembrada total |

gracias
espero que se entienda
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Re: [Qgis-user] sobre vector resumen

[Giovanni Manghi]

In english would be better
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Re: [Qgis-user] Do you use the MemoryLayerSaver plugin?

[Paolo Cavallini]

Il 15/08/2012 09:25, Chris Crook ha scritto:
> Hi Paolo
>
> Yes, I was thinking of the python bindings - 
this shouldn't be a big issue, as they are included in main packages anyway.
all the best.

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Paolo Cavallini - Faunalia
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Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario

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Re: [Qgis-user] problems making grass training map via qgis

[Paolo Cavallini]

Or use OTB, also through sextante.
--
http://faunalia.eu/pc 
Sent from mobile, sorry for being short

richard burcher  ha scritto:

Another option is to create training polygons & use [1] SAGA for the
supervised classification (either standalone or through the Sextante
plugin). I've recently gone this way for a maximum likelihood
classification.

[1] http://www.saga-gis.org/en/index.html

Cheers,

Richard



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Re: [Qgis-user] split features

[skampus]

yes, andreas, it is as you say.
but if you don't cross it happens as first post reports: nothin' happens!
definitevely you must cross the boundaries.



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Re: [Qgis-user] sobre vector resumen

[Alfonso Flaquer]

Eduardo, no comprendo claramente el problema, estas buscando hacer una suma de 
áreas por región?
Saludos 
Correo enviado utilizando el servicio BlackBerry de Entel

-Original Message-
From: Eduardo Arévalo 
Sender: qgis-user-boun...@lists.osgeo.org
Date: Wed, 15 Aug 2012 15:31:29 
To: 
Subject: [Qgis-user] sobre vector resumen

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Re: [Qgis-user] sobre vector resumen

[Eduardo Arévalo]

 en todos lo dbfs hay una columna en donde se ha registrado el total del
area sembrada del mes .
lo que quiero hacer es tener un nuevo dbf en donde se tenga la suma de
todas las areas sembradas.

2012/8/15 Alfonso Flaquer 

> Eduardo, no comprendo claramente el problema, estas buscando hacer una
> suma de áreas por región?
> Saludos
> Correo enviado utilizando el servicio BlackBerry de Entel
>
> -Original Message-
> From: Eduardo Arévalo 
> Sender: qgis-user-boun...@lists.osgeo.org
> Date: Wed, 15 Aug 2012 15:31:29
> To: 
> Subject: [Qgis-user] sobre vector resumen
>
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Re: [Qgis-user] problems making grass training map via qgis

[richard burcher]

Hi Paolo,

Could you please elaborate on accessing the grass cli through qgis? 

I only see the grass plugin shell command prompt which doesn't seem to work?
(gives dos prompt without access to grass plugin modules).

setup:
qgis 1.8
win 7


Cheers,

Richard



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Re: [Qgis-user] image boundary

[Alister Hood]

> Date: Wed, 15 Aug 2012 17:44:24 +0200
> From: Ivan Mincik 
> To: skampus 
> Cc: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] image boundary
> Message-ID: <1345045464.4203.7.camel@t61>
> Content-Type: text/plain; charset="utf-8"
> 
> On Tue, 2012-08-14 at 19:15 -0700, skampus wrote:
> > thanks to giovanni manghi who told me to use tileindex module of gdal
> > in the raster menu.
> > great! all it works so i have my brand new shapefile having the path
> > each photo as attribute of each polygon.
> >
> > now i'd like to add an action in order to add the image to TOC.
> > what is the qgis internal function to use as an action to add raster
> > image to toc?
> 
> Do You know that You can use 'gdalbuildvrt' command to create virtual
> raster layer containing all your raster files and load it as one layer.
> Than files matching your viewport will be automatically loaded by demand.

FWIW Gdalbuildvrt is also available in the QGIS menu under Raster>Miscellaneous
But there are cases where using an action to load a raster from a tileindex is 
preferable...
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Re: [Qgis-user] problems making grass training map via qgis

[Paolo Cavallini]

Il 16/08/2012 01:35, richard burcher ha scritto:
> Hi Paolo,
>
> Could you please elaborate on accessing the grass cli through qgis? 
>
> I only see the grass plugin shell command prompt which doesn't seem to work?
> (gives dos prompt without access to grass plugin modules).
Hi Richard,
the shell you mention is a full GRASS shell, so you can run any GRASS
command from there.
Please let me know if you encounter problems on it.
All the best.

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Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario

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Re: [Qgis-user] Vector/Raster Projection Problem

[Terry Morse]

Thank you for the suggestion, Andre.

I tried to install Openlayers using the plug-in installer, but it appears not 
to be in the official 
plug-in repository.  The closest I came  was OGR2Layers, which exports OGR 
layers to 
OpenLayers html.  I also tried googling it, but didn't locate a download 
source.  Any 
suggestions on how I can find and install it?

Thanks,
Terry

On 14 Aug 2012 at 12:37, Andre Joost wrote:

> Ok, then try a third, independent view:
> 
> Install the Openlayers plugin, open a new project in EPSG:3857 and 
> on-the-fly-projection, and load your vector and raster data, and a OSM 
> or Google background from OL plugin.
> 
> The layer that does not coincide with Openstreetmap or Google 
> background, has a wrong CRS.
> 
> HTH,
> André Joost
> 
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Terry Morse
935 SW 10th St. #6
Newport, OR 97365
Phone: 541-265-8434
e-mail: tmo...@teleport.com
http://home.teleport.com/~tmorse/index.html


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