[Qgis-user] compute spatial derivatives from raster bands

[Lee Eddington]

I’m fairly new to QGIS and would like to compute spatial derivatives (d/dx, 
d/dy) of raster band data.  Is there a tool, computational interface or plugin 
that does this already?

Thanks,
Lee

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Re: [Qgis-user] how to properly reference longitude values in different datasets

[Lee Eddington]

Coming back to this…I did some reading on MDAL and tried the instructions found 
at:

https://www.lutraconsulting.co.uk/blog/2018/10/18/mdal/ 


trying to load the GFS dataset as a mesh instead of a raster, but I get the 
following error message:

Tools::BufferedFileWriter::open: Cannot open file.: unspecified 
upstream_category error

I also tried loading the ECMWF_ERA-40_subset.nc dataset linked to the blog post 
and get an error message saying it is an invalid data source.

I’m using QGIS version 3.4.1-Madeira on MacOSX 10.14.2

Lee



> On Dec 21, 2018, at 2:46 PM, Lee Eddington  wrote:
> 
> As a raster.
> 
> Sent from my iPhone
> 
> On Dec 21, 2018, at 12:09 AM, Saber Razmjooei 
>  > wrote:
> 
>> Did you open your layer as Mesh layer or Raster?
>> 
>> Cheers
>> Saber
>> 
>> On Fri, 21 Dec 2018 at 05:59, Lee Eddington > > wrote:
>> That worked.
>> 
>> Thanks,
>> Lee
>> 
>> 
>>> On Dec 20, 2018, at 6:06 AM, Saber Razmjooei 
>>> >> > wrote:
>>> 
>>> Climate Data Operator (CDO):
>>> https://code.mpimet.mpg.de/projects/cdo/ 
>>> 
>>> 
>>> cdo sellonlatbox,-180,180,-90,90 input.grib output.grib
>>> 
>>> Regards
>>> Saber
>>> 
>>> On Thu, 20 Dec 2018 at 13:00, Lee Eddington >> > wrote:
>>> Can you point me to the external tools?
>>> 
>>> Thanks,
>>> Lee
>>> 
>>> 
 On Dec 20, 2018, at 12:46 AM, Saber Razmjooei 
 >>> > wrote:
 
 This is a known issue and can be fixed with some external tools. 
 I have filed a bug:
 https://issues.qgis.org/issues/20853 
 And hopefully get around to fix it in 3.6
 
 Regards
 Saber
 
 On Thu, 20 Dec 2018 at 01:44, Lee Eddington >>> > wrote:
 I’m pretty new to QGIS and am trying to figure out how to modify longitude 
 values of layers.  I was able to add a raster layer in GRIB2 format (NCEP 
 global meteorological data).  The longitude values range from 0 to 360 
 degrees.  I’m able to view and do calculations on the data with no 
 problem.  I also added shaded relief and coastline data from Natural 
 Earth.  This data has longitude values from -180 to 180 degrees.  So from 
 -180 to 0 degrees I only see the Natural Earth data, from 0 to 180 degrees 
 I see both datasets and from 180 to 360 degrees I only see the GRIB2 data. 
  I want both datasets to be referenced the same with regards to longitude 
 (-180 to 180, 0 to 360 or whatever).  It seems like this should be a 
 fairly easy problem to fix by either adding 180 degrees to longitudes from 
 the Natural Earth data or subtracting 180 from the GRIB2 longitudes, but I 
 can’t figure out how to do it.
 
 I’m using QGIS version 3.4.1-Madeira.  The CRS I’m working in is what QGIS 
 put the GRIB2 data into when I added it:   * Generated CRS (+proj=longlat 
 +a=6371229 +b=6371229 +no_defs)
 
 Thanks,
 Lee
 
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 -- 
 Saber Razmjooei
 www.lutraconsulting.co.uk 
 +44 (0)7568 129733
>>> 
>>> 
>>> 
>>> -- 
>>> Saber Razmjooei
>>> www.lutraconsulting.co.uk 
>>> +44 (0)7568 129733
>> 
>> 
>> 
>> -- 
>> Saber Razmjooei
>> www.lutraconsulting.co.uk 
>> +44 (0)7568 129733

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[Qgis-user] Best practice to install OTB and SAGA plugins

[Giacomo Fontanelli]

Hi forum

could you suggest me the best way to install SAGA and OTB plugins in ubuntu
18.10 and QGIS 2.18.22?


What version of SAGA plugin that better fit with my QGIS version do I need
to install?  2.3.1?
Do I need to install the SAGA standalone version as well?

Many thanks
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Re: [Qgis-user] Error when using poligonize (raster to vector)

[Andre Joost]

Am 28.12.18 um 15:58 schrieb Reginald:

Hi,

I have a heatmap mask tif file that I want to polygonize.
I use qgis 3.4.2 on Windows 7.
Every time I run the processing tool I get the message:
gdal_polygonize.bat is not recognised as an internal or external command
Seems like something about the path is missing?
I can't find gdal_polygonize in C:\OSGeo4W64\bin.


It should be there (.bat and .py). Maybe your GDAL installation is broken.

HTH,
Andre Joost


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[Qgis-user] Error when using poligonize (raster to vector)

[Reginald]

Hi,

I have a heatmap mask tif file that I want to polygonize.
I use qgis 3.4.2 on Windows 7.
Every time I run the processing tool I get the message:
gdal_polygonize.bat is not recognised as an internal or external command
Seems like something about the path is missing?
I can't find gdal_polygonize in C:\OSGeo4W64\bin.
Any idea?

Regards,




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Re: [Qgis-user] QGIS-Server: How remove the maptip from GetFeatureInfo HTML response

[Andrea Peri]

Hi,
I resolve it.

To remove it, Is necessary
open "layer properties", go to "display" section,
and set to HTML with value empty.

Regards,

A.


Il giorno ven 28 dic 2018 alle ore 09:19 Andrea Peri 
ha scritto:

> Hi,
>
> I'm using gis-server v 2.18.
> When try a GetFeatureInfo request with HTML response, I see a virtual
> field named:
> "maptip"
>
> Is this virtual field removable from the html response ?
>
> Thx,
> Andrea
>
> --
> -
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -
>


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. . . . . . . . .
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Re: [QGIS-it-user] Download massivo di plugin da Repository

[Totò]

Marco wrote
> Forse un'alternativa meno velleitaria ma probabilmente più pratica e
> fattibile rispetto a quello che avevo prospettato nel mio post di ieri
> potrebbe essere (come suggerito anche da Roberto Montagnetti) quella di
> limitarmi al solo kit di plugin che conosco e che uso (che comunque non
> sono pochi) e quindi, tramite le istruzioni fornite anni addietro da ARPA
> Piemonte, provare a fare una versione "Portable" di QGIS 2.18 LTR +
> Plugin.
> Le istruzioni di ARPA Piemonte erano riferite alla gloriosa versione 1.x e
> quindi non sono sicuro che funzionino anche per la 2.x, però tentare non
> nuoce.

Conosco persone che 'grattano' qualsiasi cosa dal web:
basta la riga di comando e qualche riga di codice... e lo scraping è
servito.
Rimane da capire l'utilità di tutto ciò.

saluti



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Re: [QGIS-it-user] Download massivo di plugin da Repository

[Marco Spaziani]

Forse un'alternativa meno velleitaria ma probabilmente più pratica e
fattibile rispetto a quello che avevo prospettato nel mio post di ieri
potrebbe essere (come suggerito anche da Roberto Montagnetti) quella di
limitarmi al solo kit di plugin che conosco e che uso (che comunque non
sono pochi) e quindi, tramite le istruzioni fornite anni addietro da ARPA
Piemonte, provare a fare una versione "Portable" di QGIS 2.18 LTR + Plugin.
Le istruzioni di ARPA Piemonte erano riferite alla gloriosa versione 1.x e
quindi non sono sicuro che funzionino anche per la 2.x, però tentare non
nuoce.

Il giorno ven 28 dic 2018 alle ore 01:41 Paolo Cavallini <
cavall...@faunalia.it> ha scritto:

> Salve,
>
> On 27/12/18 22:15, Marco Spaziani wrote:
>
> > A tal riguardo volevo sapere: qualcuno di voi conosce un modo per fare
> > un download massivo, in una unica soluzione, di tutti i plugin per QGIS
> > 2.18 LTR contenuti nel Repository?
>
> direi che non è possibile per l'utente.
> Saluti.
>
> --
> Paolo Cavallini - www.faunalia.eu
> QGIS.ORG Chair:
> http://planet.qgis.org/planet/user/28/tag/qgis%20board/
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[Qgis-user] QGIS-Server: How remove the maptip from GetFeatureInfo HTML response

[Andrea Peri]

Hi,

I'm using gis-server v 2.18.
When try a GetFeatureInfo request with HTML response, I see a virtual field
named:
"maptip"

Is this virtual field removable from the html response ?

Thx,
Andrea

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. . . . . . . . .
qwerty àèìòù
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