[Qgis-user] RASTER RESOLUTION REDUCING

[Nuno Manuel de Figueiredo de Santos Loureiro via QGIS-User]

Dear all,

I need to reduce the resolution of a raster, from a 30 meter pixel to a 2500 
meter pixel.
Performing this operation via "Creating new layers from an existing layer" and 
using the "Resolution" raster parameter is very easy.
But the value of the new 2500 meter grids is not the average of the values ​​of 
the 30 meter grids.

How can I determine that in the destination grids its value is the average of 
the values ​​in the original grids?

Suggestions will be very welcome!

Grateful,

Nuno
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[Qgis-user] Issue using Symbology Style

[Nuno Manuel de Figueiredo de Santos Loureiro]

Hello all,

I'm producing a LCLU map and I 've created Symbols with Colours and Font 
Markers. Units are always configured as 'Map Units'.

In some of the polygons the letters appear and disappear when the scale 
changes. The same happens when I prepare Layouts. Depending on the scale being 
used, the letters are either visible or invisible. This does not happen on all 
polygons. It only happens in some...

Can anyone give suggestions on the cause of this problem, and how to solve it?

Very grateful in advance!


Nuno
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[Qgis-user] SemiAutomaticClassificationPlugin on QGIS 3.6.2 in a macOS

[Nuno Manuel de Figueiredo de Santos Loureiro]

Hi all,

I'm trying to install the SemiAutomaticClassificationPlugin on QGIS 3.6.2 in a 
macOS Mojave 10.14.5.

However I'receiving the following error message:
Couldn't load plugin'...' due to an error when calling its classFactory() method

Can somebody help me to fix this?

Many thanks in advance!


Nuno



-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-

Nuno de Santos Loureiro (PhD)

Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8

Universidade do Algarve

Campus de Gambelas

8005-139 FARO   (Portugal)

-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
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Re: [Qgis-user] QGIS 6.3 for macOS 10.14.5 : HELP

[Nuno Manuel de Figueiredo de Santos Loureiro]

Hi Ramon,

Many thanks.
I followed your recommendations.
However a few issues remain.
William wrotes:

/Library/Frameworks/Python.framework/Versions/3.6/bin:/Library/Frameworks/GDAL.framework/Versions/2.3/Programs:

in the step by step
But he also says that GDAL is 2.4 and not 2.3.

I checked in my computar and I have GDAL 1.11, 2.1, GDAL 2.2 and GDAL 2.4.
I believe that GDAL 1.11 and 2.1 is needed for QGIS 2.18.23, that GDAL 2.2 is 
not needed and that GDAL 2.4 is needed for QGIS 3.6.2.
Is this true?

After, I changed the above line to

/Library/Frameworks/Python.framework/Versions/3.6/bin:/Library/Frameworks/GDAL.framework/Versions/2.4/Programs:

(only 2.3 to 2.4)

Finally the Merge a few rasters works well ;-)

But the following step, the Clip a raster using a mask layer is not working.
Instead I received the following message:

ERROR 1: Cutline polygon is invalid.


Note that the same task (Clip a raster using a mask layer) in QGIS 2.18.23 
(using the same input layers) runs without any kind of troubles.


Ramon, have you any additional suggestions???


many thanks for your attention,


Nuno



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Nuno de Santos Loureiro (PhD)

Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8

Universidade do Algarve

Campus de Gambelas

8005-139 FARO   (Portugal)

-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-


From: Ramon Andinach 
Sent: 22 May 2019 00:43
To: Nuno Manuel de Figueiredo de Santos Loureiro
Cc: qgis-user
Subject: Re: [Qgis-user] QGIS 6.3 for macOS 10.14.5 : HELP

Hi Nuno,

You need to set some environmental variables, so that the GDAL binaries can be 
found.
William provides a nice step by step in file Read Me.txt

If you’ve already deleted the dmg I’ll paste it into a reply, but you should 
read Read Me.txt because it contains other useful bits of information besides 
the answer to your question.

Regards,
Ramon.

On 22 May 2019, at 07:14, Nuno Manuel de Figueiredo de Santos Loureiro 
mailto:nlou...@ualg.pt>> wrote:

Hi all,

I'm a very regular (happy) user of QGIS 2.18.23.
Recently I installed QGIS 6.3.2 on my Mac with macOS 10.14.5.
Several tasks are running very well but when I tried to merge a few rasters I 
was not able to do that and I received the following message:

GDAL command output:
/bin/sh: gdal_merge.py: command not found

Also, when I tried to clip a raster using a mask layer I was not able to do 
that and I received the following message:

GDAL command output:
/bin/sh: gdalwarp: command not found

What is missing or wrong?
Can somebody help me with some tips to fix this issue?

Many thanks in advance,

Nuno



-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
Nuno de Santos Loureiro (PhD)
Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8
Universidade do Algarve
Campus de Gambelas
8005-139 FARO   (Portugal)
-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
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[Qgis-user] QGIS 6.3 for macOS 10.14.5 : HELP

[Nuno Manuel de Figueiredo de Santos Loureiro]

Hi all,

I'm a very regular (happy) user of QGIS 2.18.23.
Recently I installed QGIS 6.3.2 on my Mac with macOS 10.14.5.
Several tasks are running very well but when I tried to merge a few rasters I 
was not able to do that and I received the following message:

GDAL command output:
/bin/sh: gdal_merge.py: command not found

Also, when I tried to clip a raster using a mask layer I was not able to do 
that and I received the following message:

GDAL command output:
/bin/sh: gdalwarp: command not found


What is missing or wrong?

Can somebody help me with some tips to fix this issue?


Many thanks in advance,


Nuno



-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-

Nuno de Santos Loureiro (PhD)

Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8

Universidade do Algarve

Campus de Gambelas

8005-139 FARO   (Portugal)

-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-
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Re: [Qgis-user] Free/Open Data Maps list

[Nuno Manuel de Figueiredo de Santos Loureiro]

Hi,



Europe

http://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/administrative-units-statistical-units/nuts#nuts13


World

http://www.gadm.org/country


http://www.naturalearthdata.com/


Sea

http://www.marineregions.org/


Satellite

https://earthexplorer.usgs.gov/



Nuno



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Nuno de Santos Loureiro (PhD)

www.nsloureiro.pt

Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8

Universidade do Algarve

Campus de Gambelas

8005-139 FARO   (Portugal)

-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-


From: Qgis-user  on behalf of Idan Miara 

Sent: 27 February 2018 09:30:56
To: qgis-user
Subject: [Qgis-user] Free/Open Data Maps list

Hi,

I'm looking for different maps (preferably global maps) to use as a background 
in QGIS
(Topographic maps, Orthophoto, DTM etc).
Is there a list/plugin with a collection of free/open data maps that I can use?

Regards,
Idan.
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