Re: [Qgis-user] fields are not updated with calculated field values in QGIS 2.14

[Alexandre Neto]

A dom, 6/03/2016, 21:39, Roy Marsh  escreveu:

> Hi Alexandre
> The data is UTM34S, coordinates about [20, -34], which is for the training
> exercise data (S Africa) - the layers created are where they should be
>

Those values, if from south Africa, can't be UTM. UTM are in metres, and we
should expect much higher values. Those are still in degrees.

I converted the shp file using Properties 'Set Layer CRS', from default
> 'WGS 84' to 'EPSG 32734 / WGS 84 / UTM 34S'
>

The explanation is here. Setting the layer CRS don't change it's
coordinates values, it only tells QGIS to consider the values to be in that
new CRS.

To convert the shapefile to a new CRS you need to right-click the layer and
choose save as... And then choose the new CRS.

The data type of the target field is Double, with 5 decimal places
> But then selecting the function $area just creates zero values
>

Because saying QGIS the values were in meters you got sub-meter size
features.

Good luck,

Alexandre Neto

I can't think of anything else to try and would be grateful for suggestions.
> Roy
>
>
> 2016-03-05 23:18 GMT+00:00 Alexandre Neto :
>
>> Hi Roy,
>>
>> Are you sure your data is UTM 34 S? How did you convert the data to that
>> crs? What are the approximated coordinates values of your data
>> ?
>>
>> A sáb, 5/03/2016, 20:01, Roy Marsh  escreveu:
>>
>>> Hi
>>> As a relative newcomer I have been working through the QGIS 2.14
>>> training manual. Section 4.3.3 explains how to add calculated values using
>>> the Field Calculator.
>>> But when I do this ..(the examples are from 2.8 but the same procedure
>>> seems to apply to 2.14)..  the value stays as 0. It does this whatever
>>> parameters I try. It does this for both 'new field' and 'update field.' It
>>> does this even if layers are reprojected to UTM 34S (so as to show area in
>>> metres, not degrees).
>>> Is this a bug?
>>> Thanks
>>> Roy
>>>
>>>
>>>
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>>
>> --
>> Alexandre Neto
>> -
>> @AlexNetoGeo
>> http://sigsemgrilhetas.wordpress.com
>> http://gisunchained.wordpress.com
>>
>
> --
Alexandre Neto
-
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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[Qgis-user] Reminder - Call for Submissions FOSS4G2016

[till . adams]

Hi QGIS-⁠Community,

not wanting to bother you, but also like to give everybody the chance to 
contribute to this years FOSS4G event! Hand in your talk, workshop, map 
or poster until 21st of March. You can find all relevant details and 
links here:

http://2016.foss4g.org/news-entry/call-for-submissions.html

If you have any question, don't hesitate contacting us.

Come and build bridges in Bonn,

Till
(Chair of FOSS4G 2016)

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Re: [Qgis-user] QGis on ARM with Ubuntu

[Igor Dávalos]

Adding to your repositories



http://qgis.org/ubuntugis/



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Re: [Qgis-user] fields are not updated with calculated field values in QGIS 2.14

[Igor Dávalos]

I followed this training manual a few years ago, and I repased in QGis 2.12 
Pisa. 
There are not such a bug.
Maybe you not select 'Decimal Number' 'Numeric' to the TYPE field.Maybe the 
projection is not that you think, verify in the layer propierties.Maybe you 
don't select the layer that especify the manualTry to start again from the 
beggining the point 4.3.3.Verify the data again and again :D
Regards
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Re: [Qgis-user] 2.5d webmaps with qgis2web

[Anita Graser]

On Sun, Mar 6, 2016 at 12:04 PM, Tom Chadwin 
wrote:

> Hi Anita
>
> It's still experimental, and there's no documentation yet, so we can try to
> see what might be going wrong. In the first instance:
>
> - It only works with layers which have the 2.5d renderer explicitly
> selected. In other words, if you use that renderer, but then convert to
> another to create eg categorized 2.5d, it won't detect it as 2.5d. That's
> to
> be developed.
>
> - Polygon layers only, I think - I believe that's all OSMBuildings
> supports.
>
> - I think it won't work with multiple 2.5d layers in your map, only with
> one.
>
> - Other than that, try hitting F12 to open the browser dev tools, select
> the
> Console tab, and see what JS errors are there.
>
> - If all else fails, do send me your project and layers.
>

​Sorry, can't figure out where it goes wrong:
https://dl.dropboxusercontent.com/u/42637169/25d.zip

Best wishes,
Anita​





>
> I do want to get this good enough for a non-experimental release, so these
> kind of bug reports are invaluable.
>
> Thanks
>
> Tom
>
>
>
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> View this message in context:
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[Qgis-user] QGis on ARM with Ubuntu

[Luí­s de Sousa]

Dear all,

I have Ubuntu 14.04 running on an ARM laptop and would like to install QGis on 
it. Usually I install software from the ubuntugis PPA, but at this moment they 
are not providing a QGis package for the ARM architecture.

Other than compiling it myself, what other options are there to install QGis on 
this system?

Thank you,

Luís

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Re: [Qgis-user] 2.5d webmaps with qgis2web

[Tom Chadwin]

Hi Anita

It's still experimental, and there's no documentation yet, so we can try to
see what might be going wrong. In the first instance:

- It only works with layers which have the 2.5d renderer explicitly
selected. In other words, if you use that renderer, but then convert to
another to create eg categorized 2.5d, it won't detect it as 2.5d. That's to
be developed. 

- Polygon layers only, I think - I believe that's all OSMBuildings supports.

- I think it won't work with multiple 2.5d layers in your map, only with
one. 

- Other than that, try hitting F12 to open the browser dev tools, select the
Console tab, and see what JS errors are there.

- If all else fails, do send me your project and layers.

I do want to get this good enough for a non-experimental release, so these
kind of bug reports are invaluable. 

Thanks

Tom



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Re: [Qgis-user] 2.5d webmaps with qgis2web

[Anita Graser]

On Fri, Mar 4, 2016 at 8:24 PM, Tom Chadwin  wrote:

> Those of you who are using 2.14's splendid new 2.5d renderer can now try
> exporting as a webmap. The plugin qgis2web 1.1.0 (experimental) can now
> export 2.5d layers to a Leaflet webmap (Openlayers 3 is not yet supported).
> Do try it out, and report any issues you have at
> https://github.com/tomchadwin/qgis2web/issues. It is an experimental new
> feature, so be patient with it.
>

​Hi Tom,
Sounds great, I updated the plugin and changed to Leaflet, but no 2.5
layers are displayed in the preview. Is there anything else that needs to
be done? (OSGeo4W 2.14 nightly)
Best wishes,
Anita​
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[Qgis-user] Doubt about postgis materialized views

[Xavier Barnada]

Hi,

I noticed an inconsistent behavior on Qgis 2.14 when I try to load a data
from a postgis database.
It's the following, if I load the table x I don't need any primary key, but
if I create a view or a materialized view of the table x it must have a
primary key.
I solved it adding a key field when created the view but I don't understand
why this difference.
If anyone can explain me this difference I will be grateful.

Cheers
Xavier Barnada
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Re: [Qgis-user] R in QGIS on OSX using Kyngchaos build

[gene]

Processing has nothing to do with rpy2. it uses  subprocess
   to execute the
original R script

The explication is in the
/Applications/QGIS.app/Contents/Resources/python/plugins/processing/algs/r/RUtils.py
script

1) RUtils first create a temporary file named
/Users/.../.qgis2/processing/processing_script.r with the desired R commands
(def createRScriptFromRCommands(commands):, line 73)

Example of the content of a processing_script.r file 

options("repos"="http://cran.at.r-project.org/";)
tryCatch(find.package("rgdal"), error=function(e)
install.packages("rgdal", dependencies=TRUE))
tryCatch(find.package("raster"), error=function(e)
install.packages("raster", dependencies=TRUE))
library("raster")
library("rgdal")
Layer =
readOGR("/Users/Shared/telechargement/04_01_16/valuerelation_testproject",layer="testo2")
Field="num"
Summary_statistics<-data.frame(rbind(sum(Layer[[Field]]),
length(Layer[[Field]]),
length(unique(Layer[[Field]])),
min(Layer[[Field]]),
max(Layer[[Field]]),
max(Layer[[Field]])-min(Layer[[Field]]),
mean(Layer[[Field]]),
   
median(Layer[[Field]]),sd(Layer[[Field]])),row.names=c("Sum:","Count:","Unique
values:","Minimum value:","Maximum value:","Range:","Mean value:","Median
value:","Standard deviation:"))
colnames(Summary_statistics)<-c(Field)
Summary_statistics

2) it execute the script with subprocess (def executeRAlgorithm:, line 88). 

  command = ["R", "CMD","BATCH", "--vanilla",  
RUtils.getRScriptFilename(),RUtils.getConsoleOutputFilename()]
  proc = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE,
stdin=subprocess.PIPE,stderr=subprocess.STDOUT, universal_newlines=True)

3) If you want, you can also use R directly to execute the script 

 source("processing_script.r")

Conclusions

a) you need access to R in command line (Terminal.app) 

   export R_HOME=/Library/Frameworks/R.framework/Versions/Current/Resources/
in the .bash_profile file

b) you need to install all the R packages independently of QGIS
  install.packages('rgdal')
  install.package('raster') 
  .




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