[Qgis-user] QGIS Android, GPS

[Siki Zoltan]

Deae All,

I've installed QGIS Android on a WayteQ xTAB-7X tablet. I would like to 
use the position from the on board GPS.

How can I solve it?

Thanks,
Zoltan
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[Qgis-user] QGIS on Android

[Chuck Young]

Hello:  I recently installed QGIS on my Tablet and I can't seem to get it
to load any layers.  Also it seems to want a mouse to use it.  That seems a
bit out of the Android tablet norm.

Thanks for any tips!

Chuck
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Re: [Qgis-user] Maps generation with Python (or Atlas ?)

[Benoît Laurent]

Thank you for your help.


Hi,

2015-05-18 17:51 GMT+02:00 Benoît Laurent >:


Hello,

I would like to generate a series of maps representing tracks with
stops along them.

For each track, I have got a group of two layers, one for the
linear, one for the points that have associated information
(basically name and time of the stops). First, is there a better
way to achieve this ? For the moment, I have to handle two types
of layer. It is the beginning of my problems.

As the tracks overlap, I would like to generate a map for each
track where only the current selected track appears. The others
would be hidden.

I had a try with Atlas generation. It perfectly works except that
I can't hide the other tracks.

You can style your coverage layer so that only atlas current feature 
will appear. In categorized style, use an expression like 
$id=$atlasfeatureid. You'll get 0 (false) and 1 (true) when classing. 
Set the 0 features style so that they become invisible or transparent.
It is a little better : with your help, I can highlight the current 
linear layer. Actually, I aggregated all my linear layers to constitute 
the coverage layer. However, I can't hide the points layers.




I also had a try with a Python script. I managed to iterate over
the groups of layers but I can't refresh the map canvas during the
Python script. So, it doesn't work.

A snippet of your code may help but I remember I had to face such a 
problem and it was because after *myatlas.beginRender()*, I forgot to 
set active the export of the atlas, sthg like 
*mycomposition.setAtlasMode(QgsComposition.ExportAtlas)*


Actually, I did not use the Atlas generator (maybe a mistake ?). I 
wanted to reproduce/modify its behavior. Here is a piece of code 
(remember that for each track, there is linear layer and a points layer) :


| # Iterate over groups of pair of layers
for  gin  range(0,nbGroups-1):

# Display layers of the current group
layer=  layers[2*g]
rectTrajet=  layer.extent() 
legend.setLayerVisible(layer,  True)

layer=  layers[2*g+1]
rectPtsArr=  layer.extent()
legend.setLayerVisible(layer,  True) 


# extent area
rectGlb=  QgsRectangle
xMin=  min(rectTrajet.xMinimum(),  rectPtsArr.xMinimum())
xMax=  max(rectTrajet.xMaximum(),  rectPtsArr.xMaximum())
yMin=  min(rectTrajet.yMinimum(),  rectPtsArr.yMinimum())
yMax=  max(rectTrajet.yMaximum(),  rectPtsArr.yMaximum())
rectGlb=  QgsRectangle(xMin,  yMin,  xMax,  yMax)
self.iface.mapCanvas().setExtent(rectGlb)

self.iface.mapCanvas().zoomToSelected()
self.iface.mapCanvas().updateScale()
self.iface.mapCanvas().zoomByFactor(1.5)

# Nothing works here !!
self.iface.mapCanvas().updateOverview()
self.iface.mapCanvas().refresh()
layers[2*g].triggerRepaint()
layers[2*g+1].triggerRepaint()


# Map composer
composerMap=  QgsComposerMap(c,x,y,w,h)
composerMap.setPreviewMode(QgsComposerMap.Render)
composerMap.updateBoundingRect()
composerMap.renderModeUpdateCachedImage()
composerMap.setFrameEnabled(True)
c.addItem(composerMap)


# Launch printing
printer=  QtGui.QPrinter()
printer.setOutputFormat(QtGui.QPrinter.PdfFormat)
printer.setOutputFileName(nomFichier)
printer.setPaperSize(QSizeF(c.paperWidth(),  c.paperHeight()),  
QtGui.QPrinter.Millimeter)
printer.setFullPage(True)
printer.setColorMode(QtGui.QPrinter.Color)
printer.setResolution(c.printResolution())

pdfPainter=  QPainter(printer)
paperRectMM=  printer.pageRect(QtGui.QPrinter.Millimeter)
paperRectPixel=  printer.pageRect(QtGui.QPrinter.DevicePixel)
c.render(pdfPainter,  paperRectPixel,  paperRectMM)
pdfPainter.end()

# Remove map composer
c.removeItem(composerMap)

# Hide layers of the current group
legend.setLayerVisible(layers[2*g],  False)
legend.setLayerVisible(layers[2*g+1],  False)

 |




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Re: [Qgis-user] Maps generation with Python (or Atlas ?)

[DelazJ]

Hi,

2015-05-18 17:51 GMT+02:00 Benoît Laurent :

> Hello,
>
> I would like to generate a series of maps representing tracks with stops
> along them.
>
> For each track, I have got a group of two layers, one for the linear, one
> for the points that have associated information (basically name and time of
> the stops). First, is there a better way to achieve this ? For the moment,
> I have to handle two types of layer. It is the beginning of my problems.
>
> As the tracks overlap, I would like to generate a map for each track where
> only the current selected track appears. The others would be hidden.
>
> I had a try with Atlas generation. It perfectly works except that I can't
> hide the other tracks.
>
>
You can style your coverage layer so that only atlas current feature will
appear. In categorized style, use an expression like $id=$atlasfeatureid.
You'll get 0 (false) and 1 (true) when classing. Set the 0 features style
so that they become invisible or transparent.


> I also had a try with a Python script. I managed to iterate over the
> groups of layers but I can't refresh the map canvas during the Python
> script. So, it doesn't work.
>
> A snippet of your code may help but I remember I had to face such a
problem and it was because after *myatlas.beginRender()*, I forgot to set
active the export of the atlas, sthg like
*mycomposition.setAtlasMode(QgsComposition.ExportAtlas)*


> Do others faced a similar problem ? Any help would be appreciated.
>
> Regards,
>
> Benoît
>
>
>
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> http://www.avast.com
>
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Re: [Qgis-user] [GRASS-dev] QGIS GRASS Plugin Upgrade Crowdfunding

[Radim Blazek]

On Mon, May 18, 2015 at 2:22 PM, Sören Gebbert
 wrote:
> Dear all,
> just a short reminder. The crowd funding period for the QGIS GRASS
> Plugin is still running but will end soon. Everyone who may be
> willingly to fund this great project can contribute funds until May
> 23.

BTW, raster/vector import via browser is in master (pushed today), you can test.

Dual build (with GRASS 6 + 7) is also available. Big thanks to Jef for
porting dual build to Windows.
Currently there is unfortunately some problem in browser with GRASS 7
vectors (crash), but GRASS 7 vectors load correctly from project file
(e.g. project created in GRASS 6, vectors upgraded to GRASS 7 and
project reopened in QGIS with GRASS 7).

I'll do more detailed announcement after QGIS 2.10 freeze.

Radim

> Best regards
> Soeren
>
> 2015-03-23 19:56 GMT+01:00 Radim Blazek :
>> Hi all,
>>
>> I have finally launched the crowdfunding campaign to support the GRASS
>> plugin upgrade. Briefly, it covers upgrade to GRASS 7, browser
>> integration, drag-and-drop import and new vector editing. All the
>> details are available here:
>>
>> http://www.gissula.eu/qgis-grass-plugin-crowdfunding/
>>
>> Please propagate this info to all relevant channels, national mailing lists 
>> etc.
>>
>> Radim
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[Qgis-user] Maps generation with Python (or Atlas ?)

[Benoît Laurent]

Hello,

I would like to generate a series of maps representing tracks with stops 
along them.


For each track, I have got a group of two layers, one for the linear, 
one for the points that have associated information (basically name and 
time of the stops). First, is there a better way to achieve this ? For 
the moment, I have to handle two types of layer. It is the beginning of 
my problems.


As the tracks overlap, I would like to generate a map for each track 
where only the current selected track appears. The others would be hidden.


I had a try with Atlas generation. It perfectly works except that I 
can't hide the other tracks.


I also had a try with a Python script. I managed to iterate over the 
groups of layers but I can't refresh the map canvas during the Python 
script. So, it doesn't work.


Do others faced a similar problem ? Any help would be appreciated.

Regards,

Benoît



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Re: [Qgis-user] Web-Client: same host QGIS-Server-WMS not shown

[Marc Beiling]

Hello Bernhard,

Unfortunately replacing the server name with 127.0.0.1 does not do the
trick for me. I'm going nuts, because I have no clue how to
handle it. I've tried an external wms coming from a qgis server. That
works. Only my own qgis-server-wms isnt shown in the map or the
layertree at all.
Anything else i can do?


Am Wed, 13 May 2015 12:56:27 +0200
schrieb Bernhard Ströbl :

> Hi Marc,
> it is absolutely possible to serve WMS layers from any WMS server
> with QGIS server (so called cascading WMS) but you have to make sure
> that the WMS server is accessible from the server QGIS server is
> running on. If it is the same machine try replacing the server name
> with 127.0.0.1 in the URL (in the project file), this works for me.
> 
> Bernhard
> 
> Am 13.05.2015 um 12:47 schrieb Marc Beiling:
> > Hello List,
> >
> > I have a qgis-project including certain layers and two wms (one
> > directly from my qgis server, the other through my mapproxy) from my
> > qgis-server. When I put this project on the server and open it with
> > the qgis-web-client all layers except for my wms-layers are shown.
> > It doesn't even show up in the layertree.
> >
> > I tried to change the wms-url in the .qgs from servername... to
> > localhost Doesnt work
> >
> > Its on a https server. Has this something to do with it? Is it
> > possible to show wms in a web-client-project based on another
> > project served from the same cgi-bin?
> >
> > Maybe I dont see the obvious. Any help highly appreciated.
> >
> > Thank you
> > Marc
> >
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Re: [Qgis-user] QGIS 2.9.0-Master crashes when selecting "save as..."

[Paolo Cavallini]

Il 18/05/2015 15:35, ndres ha scritto:
> Dear all,
> 
> OS: Debian testing
> QGIS: 2.9.0-Master  (1:2.9.0+git20150517+173ee45+99unstable)

Known packaging problem, have a look to qgis-dev, thread from yesterday.
All the best.

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Re: [Qgis-user] new issue with raster calculator

[Albin Blaschka]

Am 18.05.2015 um 15:07 schrieb Giacomo Fontanelli:

Dear community

I have a raster layer with pixel values ranging from -8 to -11.

when I do "layer1@band1" * 0.1 I get a map with only 0 and Nan, instead
when I do "layer1@band1" / 10 I obtain the map with correct values.

What do I do wrong?

Thank you very much



Just a shot into the blue: A problem with decimal point vs. comma? What 
do you get if you try with 0,1 instead of 0.1?


greetings,
Albin

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[Qgis-user] QGIS 2.9.0-Master crashes when selecting "save as..."

[ndres]

Dear all,

OS: Debian testing
QGIS: 2.9.0-Master  (1:2.9.0+git20150517+173ee45+99unstable)

I receive nightly updates which restarted again on 6th May, after a break
when the previous update was 5th April 2015
QGIS was functioning properly with the 5th April update.

I used QGIS for the first time since 6th May and when I tried to save an
imported .csv file as a shape file, using "save as..", QGIS crashed and
closed as soon as I selected this option.
A similar fault was reported back in 2007 and one option was to check the
attributes of the layer. I checked and all appears to be in order.
To check if the original file was corrupted, I repeated the action of saving
as a shape file with an existing shapefile (that has been used with QGIS in
the past) - same result of QGIS crashing.

I have the same OS & QGIS build on my notebook and the same problem is
present.

Is anyone else experiencing the same problem with the latest nightly-builds?
I would be very grateful for any advice provided to help fix this problem

very many thanks in advance

yours
Neil



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[Qgis-user] Is there an algorithm in Processing graphical modeler to select features in a geometryless table?

[DelazJ]

Hi,
I'm tring to build a graphical modeler within the menu Processing. In my
process, I need at a moment to select features from a csv table. But none
of the "select..." algorithms (select by attribute, select by
expression...) I can find in the algorithms list does accept table as input.
Is there a solution? Or is it a bug so that I report it?

Thanks
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[Qgis-user] logarythms with raster calculator

[Giacomo Fontanelli]

Hi forum

I need to convert a raster  map in linear values in a map with pixel value
expressed in dB, buti in raster calculator there is no the Log function.

Any suggestions?

Thank you
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[Qgis-user] new issue with raster calculator

[Giacomo Fontanelli]

Dear community

I have a raster layer with pixel values ranging from -8 to -11.

when I do "layer1@band1" * 0.1 I get a map with only 0 and Nan, instead
when I do "layer1@band1" / 10 I obtain the map with correct values.

What do I do wrong?

Thank you very much
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[Qgis-user] Mobile Client - symbol color changes

[Burghardt.Scholle]

Dear list,

when I use the mobile client with colored svg-symbols and arial images at the 
same time, the color of the symbols changes when moving or zooming the map. In 
my config.js under Config.map.wmsParams - 'FORMAT' stands the value 'image/png; 
mode=8bit'. For lines or polygons this effect doesn't occur. Can someone give 
me a hint how to solve this problem?

Kind regards
Burghardt

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Re: [Qgis-user] Which settings for mesuring tool?

[Raymond Nijssen]

Hi Joris,

The (Spherical) Mercator projection has huge disturbances in size the 
further you get from the equator. Try usiing the national projection for 
Portugal?


Good luck,
Raymond


On 17-05-15 21:41, Joris Hintjens wrote:

Hello
I have 2 point  in Portugal
my project CRS is pseudo Mercator (EPSG 3857)
When I create a buffer of 30 km around my points layer cars is also EPSG 3857), 
I get Two nice circles (layer also CRS 3857). When i measure the circles, they 
are 45 km in diameter. What can be wrong?

What settings shouldI in general use for the measuring tool?

thanks for your comments
Joris

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