Re: [Qgis-user] Importing Cropland Data Layer

[Alex M]

For those following, Emily and I worked on the problem and figured out a
workaround.

CropScape claims to provide data in EPSG:102003, however on inspection
the data is actually EPSG:5070

My QGIS 2/3 on linux properly read it as 5070, however QGIS 3 on windows
on Emily's machine read it as 102003 for some reason. Changing that in
the properties puts the file in the correct place.

Thanks,
Alex

On 08/03/2018 01:52 PM, Alex M wrote:
> Yes added the tif file, tried, drag & drop, the Browser Panel, and the
> Add Raster menu.
> 
> In all cases it lines up correctly.
> 
> Thanks,
> Alex
> 
> On 08/03/2018 01:46 PM, Emily Wine wrote:
>> Alex,
>>
>> How did you import the Cropland Data Layer into QGIS? Did you just import
>> it as a tif file? And did it line up with the correct location on World
>> Imagery?
>>
>> Thanks,
>>
>> Emily
>>
>> On Fri, Aug 3, 2018 at 1:37 PM, Emily Wine  wrote:
>>
>>> Alex,
>>>
>>> I added World Imagery by pasting this code into the Python Console:
>>>
>>>
>>> *qgis.utils.iface.addRasterLayer("http://server.arcgisonline.com/arcgis/rest/services/ESRI_Imagery_World_2D/MapServer?f=json=true","raster;
>>> )*
>>>
>>> Thanks so much,
>>>
>>> Emily
>>>
>>> On Fri, Aug 3, 2018 at 1:33 PM, Alex M  wrote:
>>>
 Ah, it changed in QGIS 3. How did you add the World Imagery?

 Your CDL file and one I downloaded worked fine for me in QGIS 2 and QGIS
 3.

 Thanks,
 Alex

 On 08/03/2018 01:16 PM, Emily Wine wrote:
> Alex,
>
> I don't see any option to enable on the fly transformation. I've
 attached a
> link showing what I see on my screen.
>
> Thanks,
>
> Emily
>
>  crs project properties.PNG
>
>
> On Fri, Aug 3, 2018 at 1:03 PM, Alex M 
 wrote:
>
>> On 08/03/2018 12:50 PM, Alex M wrote:
>>> On 08/03/2018 11:52 AM, Emily Wine wrote:
 Hi everyone!

 I am completely new to QGIS (and mapping in general), and I can't
 get my
 layers to line up.

 * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*

 *All of my layers are in the USA Contiguous Albers Equal Area
>> projection.*

 Currently, I have three layers:
 Site Coordinates
 World Imagery layer from ESRI
 Cropland Data Layer (CDL) from USDA-NASS CropScape

 My coordinates line up perfectly with the World Imagery layer.
 However,
>> the
 CDL is floating somewhere out in the universe and won't line up.

 CDL Extent:
 48885.,2818725. :
 117585.,2930685.

 I downloaded the CDL as a zipped file containing a .tif and a
>> .vat.dbf.tif
 file.
 I unzipped the file and uploaded it to QGIS as a .tif file.

>>>
>>> Can you please provide a link to what you downloaded.
>>>
 Is it possible that the georeferencing for the .tif file is encoded
 in
>> the
 .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?

>>>
>>> Nope, thats a value attribute database file.
>>>
 Thanks,

 Emily

>>>
>>> It's very likely that QGIS is just reading the projection data
>>> incorrectly. Check the Properties/Metadata tab for the layer to see
 what
>>> projection QGIS assigned the layer.
>>>
>>> Was there a tfw with the data? that would contain georeference.
>>>
>>> Thanks,
>>> Alex
>>
>> PS: Do you have projection on the Fly (OTF) enabled?
>> https://docs.qgis.org/testing/en/docs/user_manual/working_
>> with_projections/working_with_projections.html#define-on-
>> the-fly-otf-crs-transformation
>>
>> -Alex
>>
>>
>


>>>
>>
> 
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[Qgis-user] QGIS 3 Standalone Python Script

[DT]

OSX, version 10.13.6
Python 3.6.6
QGIS 3.2.1

QGIS itself is working fine with no errors, but I'm trying to write a
standalone python script that utilizes a QGIS3 tool and I keep running into
Qt errors.  This works fine:

import os
import sys
sys.path.append('/Applications/QGIS3.app/Contents/Resources/python/')
sys.path.append('/Applications/QGIS3.app/Contents/Resources/python/plugins')
from qgis.core import *

But as soon as I try to do:

app = QgsApplication([],True)

I get the following error:

>>> app = QgsApplication([],True)
This application failed to start because it could not find or load the Qt
platform plugin "cocoa"
in "".

Reinstalling the application may fix this problem.
Abort trap: 6

Anybody have an idea where I'm going wrong?  My Google fu has only managed
to turn up setting paths for Windows and not OSX.  Thanks!

DT
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Re: [Qgis-user] Importing Cropland Data Layer

[Alex M]

Yes added the tif file, tried, drag & drop, the Browser Panel, and the
Add Raster menu.

In all cases it lines up correctly.

Thanks,
Alex

On 08/03/2018 01:46 PM, Emily Wine wrote:
> Alex,
> 
> How did you import the Cropland Data Layer into QGIS? Did you just import
> it as a tif file? And did it line up with the correct location on World
> Imagery?
> 
> Thanks,
> 
> Emily
> 
> On Fri, Aug 3, 2018 at 1:37 PM, Emily Wine  wrote:
> 
>> Alex,
>>
>> I added World Imagery by pasting this code into the Python Console:
>>
>>
>> *qgis.utils.iface.addRasterLayer("http://server.arcgisonline.com/arcgis/rest/services/ESRI_Imagery_World_2D/MapServer?f=json=true","raster;
>> )*
>>
>> Thanks so much,
>>
>> Emily
>>
>> On Fri, Aug 3, 2018 at 1:33 PM, Alex M  wrote:
>>
>>> Ah, it changed in QGIS 3. How did you add the World Imagery?
>>>
>>> Your CDL file and one I downloaded worked fine for me in QGIS 2 and QGIS
>>> 3.
>>>
>>> Thanks,
>>> Alex
>>>
>>> On 08/03/2018 01:16 PM, Emily Wine wrote:
 Alex,

 I don't see any option to enable on the fly transformation. I've
>>> attached a
 link showing what I see on my screen.

 Thanks,

 Emily

  crs project properties.PNG


 On Fri, Aug 3, 2018 at 1:03 PM, Alex M 
>>> wrote:

> On 08/03/2018 12:50 PM, Alex M wrote:
>> On 08/03/2018 11:52 AM, Emily Wine wrote:
>>> Hi everyone!
>>>
>>> I am completely new to QGIS (and mapping in general), and I can't
>>> get my
>>> layers to line up.
>>>
>>> * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*
>>>
>>> *All of my layers are in the USA Contiguous Albers Equal Area
> projection.*
>>>
>>> Currently, I have three layers:
>>> Site Coordinates
>>> World Imagery layer from ESRI
>>> Cropland Data Layer (CDL) from USDA-NASS CropScape
>>>
>>> My coordinates line up perfectly with the World Imagery layer.
>>> However,
> the
>>> CDL is floating somewhere out in the universe and won't line up.
>>>
>>> CDL Extent:
>>> 48885.,2818725. :
>>> 117585.,2930685.
>>>
>>> I downloaded the CDL as a zipped file containing a .tif and a
> .vat.dbf.tif
>>> file.
>>> I unzipped the file and uploaded it to QGIS as a .tif file.
>>>
>>
>> Can you please provide a link to what you downloaded.
>>
>>> Is it possible that the georeferencing for the .tif file is encoded
>>> in
> the
>>> .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?
>>>
>>
>> Nope, thats a value attribute database file.
>>
>>> Thanks,
>>>
>>> Emily
>>>
>>
>> It's very likely that QGIS is just reading the projection data
>> incorrectly. Check the Properties/Metadata tab for the layer to see
>>> what
>> projection QGIS assigned the layer.
>>
>> Was there a tfw with the data? that would contain georeference.
>>
>> Thanks,
>> Alex
>
> PS: Do you have projection on the Fly (OTF) enabled?
> https://docs.qgis.org/testing/en/docs/user_manual/working_
> with_projections/working_with_projections.html#define-on-
> the-fly-otf-crs-transformation
>
> -Alex
>
>

>>>
>>>
>>
> 

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[Qgis-user] Importing Cropland Data Layer

[Alex M]

Interesting, that also works fine for me. Out of curiosity what order
did you add the layers in?

A workaround that might be more reliable would be to install the
Quick_Map_Services plugin (Check it's settings and add the Contributed
Pack). You'll be able to add the same layer from ESRI via that plugin
and it's usually pretty good about checking the projection issues.

Thanks,
Alex

On 08/03/2018 01:37 PM, Emily Wine wrote:
> Alex,
> 
> I added World Imagery by pasting this code into the Python Console:
> 
> 
> *qgis.utils.iface.addRasterLayer("http://server.arcgisonline.com/arcgis/rest/services/ESRI_Imagery_World_2D/MapServer?f=json=true","raster;
> )*
> 
> Thanks so much,
> 
> Emily
> 
> On Fri, Aug 3, 2018 at 1:33 PM, Alex M  wrote:
> 
>> Ah, it changed in QGIS 3. How did you add the World Imagery?
>>
>> Your CDL file and one I downloaded worked fine for me in QGIS 2 and QGIS 3.
>>
>> Thanks,
>> Alex
>>
>> On 08/03/2018 01:16 PM, Emily Wine wrote:
>>> Alex,
>>>
>>> I don't see any option to enable on the fly transformation. I've
>> attached a
>>> link showing what I see on my screen.
>>>
>>> Thanks,
>>>
>>> Emily
>>>
>>>  crs project properties.PNG
>>>
>>>
>>> On Fri, Aug 3, 2018 at 1:03 PM, Alex M 
>> wrote:
>>>
 On 08/03/2018 12:50 PM, Alex M wrote:
> On 08/03/2018 11:52 AM, Emily Wine wrote:
>> Hi everyone!
>>
>> I am completely new to QGIS (and mapping in general), and I can't get
>> my
>> layers to line up.
>>
>> * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*
>>
>> *All of my layers are in the USA Contiguous Albers Equal Area
 projection.*
>>
>> Currently, I have three layers:
>> Site Coordinates
>> World Imagery layer from ESRI
>> Cropland Data Layer (CDL) from USDA-NASS CropScape
>>
>> My coordinates line up perfectly with the World Imagery layer.
>> However,
 the
>> CDL is floating somewhere out in the universe and won't line up.
>>
>> CDL Extent:
>> 48885.,2818725. :
>> 117585.,2930685.
>>
>> I downloaded the CDL as a zipped file containing a .tif and a
 .vat.dbf.tif
>> file.
>> I unzipped the file and uploaded it to QGIS as a .tif file.
>>
>
> Can you please provide a link to what you downloaded.
>
>> Is it possible that the georeferencing for the .tif file is encoded in
 the
>> .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?
>>
>
> Nope, thats a value attribute database file.
>
>> Thanks,
>>
>> Emily
>>
>
> It's very likely that QGIS is just reading the projection data
> incorrectly. Check the Properties/Metadata tab for the layer to see
>> what
> projection QGIS assigned the layer.
>
> Was there a tfw with the data? that would contain georeference.
>
> Thanks,
> Alex

 PS: Do you have projection on the Fly (OTF) enabled?
 https://docs.qgis.org/testing/en/docs/user_manual/working_
 with_projections/working_with_projections.html#define-on-
 the-fly-otf-crs-transformation

 -Alex


>>>
>>
>>
> 

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Re: [Qgis-user] Importing Cropland Data Layer

[Alex M]

Ah, it changed in QGIS 3. How did you add the World Imagery?

Your CDL file and one I downloaded worked fine for me in QGIS 2 and QGIS 3.

Thanks,
Alex

On 08/03/2018 01:16 PM, Emily Wine wrote:
> Alex,
> 
> I don't see any option to enable on the fly transformation. I've attached a
> link showing what I see on my screen.
> 
> Thanks,
> 
> Emily
> 
>  crs project properties.PNG
> 
> 
> On Fri, Aug 3, 2018 at 1:03 PM, Alex M  wrote:
> 
>> On 08/03/2018 12:50 PM, Alex M wrote:
>>> On 08/03/2018 11:52 AM, Emily Wine wrote:
 Hi everyone!

 I am completely new to QGIS (and mapping in general), and I can't get my
 layers to line up.

 * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*

 *All of my layers are in the USA Contiguous Albers Equal Area
>> projection.*

 Currently, I have three layers:
 Site Coordinates
 World Imagery layer from ESRI
 Cropland Data Layer (CDL) from USDA-NASS CropScape

 My coordinates line up perfectly with the World Imagery layer. However,
>> the
 CDL is floating somewhere out in the universe and won't line up.

 CDL Extent:
 48885.,2818725. :
 117585.,2930685.

 I downloaded the CDL as a zipped file containing a .tif and a
>> .vat.dbf.tif
 file.
 I unzipped the file and uploaded it to QGIS as a .tif file.

>>>
>>> Can you please provide a link to what you downloaded.
>>>
 Is it possible that the georeferencing for the .tif file is encoded in
>> the
 .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?

>>>
>>> Nope, thats a value attribute database file.
>>>
 Thanks,

 Emily

>>>
>>> It's very likely that QGIS is just reading the projection data
>>> incorrectly. Check the Properties/Metadata tab for the layer to see what
>>> projection QGIS assigned the layer.
>>>
>>> Was there a tfw with the data? that would contain georeference.
>>>
>>> Thanks,
>>> Alex
>>
>> PS: Do you have projection on the Fly (OTF) enabled?
>> https://docs.qgis.org/testing/en/docs/user_manual/working_
>> with_projections/working_with_projections.html#define-on-
>> the-fly-otf-crs-transformation
>>
>> -Alex
>>
>>
> 

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Re: [Qgis-user] Importing Cropland Data Layer

[Alex M]

On 08/03/2018 12:50 PM, Alex M wrote:
> On 08/03/2018 11:52 AM, Emily Wine wrote:
>> Hi everyone!
>>
>> I am completely new to QGIS (and mapping in general), and I can't get my
>> layers to line up.
>>
>> * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*
>>
>> *All of my layers are in the USA Contiguous Albers Equal Area projection.*
>>
>> Currently, I have three layers:
>> Site Coordinates
>> World Imagery layer from ESRI
>> Cropland Data Layer (CDL) from USDA-NASS CropScape
>>
>> My coordinates line up perfectly with the World Imagery layer. However, the
>> CDL is floating somewhere out in the universe and won't line up.
>>
>> CDL Extent:
>> 48885.,2818725. :
>> 117585.,2930685.
>>
>> I downloaded the CDL as a zipped file containing a .tif and a .vat.dbf.tif
>> file.
>> I unzipped the file and uploaded it to QGIS as a .tif file.
>>
> 
> Can you please provide a link to what you downloaded.
> 
>> Is it possible that the georeferencing for the .tif file is encoded in the
>> .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?
>>
> 
> Nope, thats a value attribute database file.
> 
>> Thanks,
>>
>> Emily
>>
> 
> It's very likely that QGIS is just reading the projection data
> incorrectly. Check the Properties/Metadata tab for the layer to see what
> projection QGIS assigned the layer.
> 
> Was there a tfw with the data? that would contain georeference.
> 
> Thanks,
> Alex

PS: Do you have projection on the Fly (OTF) enabled?
https://docs.qgis.org/testing/en/docs/user_manual/working_with_projections/working_with_projections.html#define-on-the-fly-otf-crs-transformation

-Alex

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Re: [Qgis-user] Importing Cropland Data Layer

[Alex M]

On 08/03/2018 11:52 AM, Emily Wine wrote:
> Hi everyone!
> 
> I am completely new to QGIS (and mapping in general), and I can't get my
> layers to line up.
> 
> * QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*
> 
> *All of my layers are in the USA Contiguous Albers Equal Area projection.*
> 
> Currently, I have three layers:
> Site Coordinates
> World Imagery layer from ESRI
> Cropland Data Layer (CDL) from USDA-NASS CropScape
> 
> My coordinates line up perfectly with the World Imagery layer. However, the
> CDL is floating somewhere out in the universe and won't line up.
> 
> CDL Extent:
> 48885.,2818725. :
> 117585.,2930685.
> 
> I downloaded the CDL as a zipped file containing a .tif and a .vat.dbf.tif
> file.
> I unzipped the file and uploaded it to QGIS as a .tif file.
> 

Can you please provide a link to what you downloaded.

> Is it possible that the georeferencing for the .tif file is encoded in the
> .vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?
> 

Nope, thats a value attribute database file.

> Thanks,
> 
> Emily
> 

It's very likely that QGIS is just reading the projection data
incorrectly. Check the Properties/Metadata tab for the layer to see what
projection QGIS assigned the layer.

Was there a tfw with the data? that would contain georeference.

Thanks,
Alex
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[Qgis-user] Importing Cropland Data Layer

[Emily Wine]

Hi everyone!

I am completely new to QGIS (and mapping in general), and I can't get my
layers to line up.

* QGIS Version: 3.2.1-BonnStandalone-installerWindows 10 64-bit*

*All of my layers are in the USA Contiguous Albers Equal Area projection.*

Currently, I have three layers:
Site Coordinates
World Imagery layer from ESRI
Cropland Data Layer (CDL) from USDA-NASS CropScape

My coordinates line up perfectly with the World Imagery layer. However, the
CDL is floating somewhere out in the universe and won't line up.

CDL Extent:
48885.,2818725. :
117585.,2930685.

I downloaded the CDL as a zipped file containing a .tif and a .vat.dbf.tif
file.
I unzipped the file and uploaded it to QGIS as a .tif file.

Is it possible that the georeferencing for the .tif file is encoded in the
.vat.dbf.tif file? How do I import the Cropland Data Layer to QGIS?

Thanks,

Emily
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[Qgis-user] Simple Search Form

[Tyler Veinot]

Hi;
I am trying to setup a form that has a search component on one of the
layers fields. The purpose is to have a simple UI that allows a person to
type in a property ID and have all the information from that record
populate the form fields. Is there a tutorial out there for making simple
searchs in forms using Python? All the ones I found were attribute editing
and exporting.
Thanks;
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Re: [QGIS-it-user] Qgis Versione di QGIS 3.0.2-Girona - Windows 10 - Errore algoritmo voronoi

[Luca Lanteri]

Come prima cosa provalo sulla 3.2.1

Luca

Il ven 3 ago 2018 11:56 Luca Mandolesi  ha scritto:

> Ciao a tutti,
>
> su Girona 3.0.2 sotto windows 10 ho un layer puntuale epsg 25832,
> all'interno di un DB postgres, esportate ANCHE in shp, che fa fallire la
> creazione dei poligoni di Voronoi secondo l'errore sotto riportato...che mi
> pare dica poco sulle cause...
>
>
> Problema presente dopo che è apparso il campo buffer nell'algoritmo (non
> ricordo da quale versione)
>
> Qualche idee di test da fare?
>
> Ciao
> Luca
>
> [0]
> 
>
> Processing algorithm…
>
> AlgorithmDialog
>
> Parametri in ingresso:
>
> { 'BUFFER' : 1, 'INPUT' :
> 'C:\Users\Luca\test_to_trash\test_to_trashvoronoii.shp', 'OUTPUT' :
> 'memory:' }
>
>
> Traceback (most recent call last):
> File
> "C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\qgis\VoronoiPolygons.py",
> line 128, in processAlgorithm
> self.tr('There were no polygons created.'))
> _core.QgsProcessingException: Nessun poligono creato.
>
> Execution failed after 0.03 seconds
>
>
> Caricamento layer
>
> Algoritmo 'Poligoni di Voronoi' terminato
>
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Re: [QGIS-it-user] Poligonizazzione complicata

[Luca Mandolesi]

È il grail che non esisteforse con tools di imaging ci si sta arrivando
piano piano...

Il ven 3 ago 2018, 12:54 nformica  ha scritto:

> Marco wrote
> > Inkscape, tra le altre cose, ha anche un buon vettorializzatore di
> raster.
> > Provalo.
>
> ... grazie del suggerimento Marco, ma ci ho provato e non viene fuori
> nulla.
> Ma forse sono io che non lo so usare !
>
> Saluti
> Nino
>
>
>
> --
> Sent from:
> http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f5250612.html
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Re: [QGIS-it-user] Poligonizazzione complicata

[nformica]

Marco wrote
> Inkscape, tra le altre cose, ha anche un buon vettorializzatore di raster.
> Provalo.

... grazie del suggerimento Marco, ma ci ho provato e non viene fuori nulla. 
Ma forse sono io che non lo so usare !

Saluti
Nino



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[QGIS-it-user] Qgis Versione di QGIS 3.0.2-Girona - Windows 10 - Errore algoritmo voronoi

[Luca Mandolesi]

Ciao a tutti,

su Girona 3.0.2 sotto windows 10 ho un layer puntuale epsg 25832,
all'interno di un DB postgres, esportate ANCHE in shp, che fa fallire la
creazione dei poligoni di Voronoi secondo l'errore sotto riportato...che mi
pare dica poco sulle cause...


Problema presente dopo che è apparso il campo buffer nell'algoritmo (non
ricordo da quale versione)

Qualche idee di test da fare?

Ciao
Luca

[0]


Processing algorithm…

AlgorithmDialog

Parametri in ingresso:

{ 'BUFFER' : 1, 'INPUT' :
'C:\Users\Luca\test_to_trash\test_to_trashvoronoii.shp', 'OUTPUT' :
'memory:' }


Traceback (most recent call last):
File
"C:/PROGRA~1/QGIS3~1.0/apps/qgis/./python/plugins\processing\algs\qgis\VoronoiPolygons.py",
line 128, in processAlgorithm
self.tr('There were no polygons created.'))
_core.QgsProcessingException: Nessun poligono creato.

Execution failed after 0.03 seconds


Caricamento layer

Algoritmo 'Poligoni di Voronoi' terminato
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Re: [QGIS-it-user] Poligonizazzione complicata

[Marco Spaziani]

Inkscape, tra le altre cose, ha anche un buon vettorializzatore di raster.
Provalo.

Il giorno ven 3 ago 2018 alle ore 09:40 nformica  ha
scritto:

> Digitalizzare una mappa raster è sempre una rogna o comunque un lavoro
> lungo
> !!
> Devo ricavare i poligoni che rappresentano gli isolati (o edifici) di un
> centro urbano da una mappa raster di cui vi allego un esempio.
>
> Fare tutto i lavoro a mano (digitalizzare i poligoni) richiede un sacco di
> tempo, perchè la mappa è grande.
>
> Il tool QGIS di poligonizzazione dei raster non va bene perchè come vedete
> nell'allegato il riempimento dei poligoni e fatto di tante lineette e poi
> nella mappa ci sono tanti altri tratti grafici oltre gli isolati.
>
> Manco a dire che non ho a disposizione il vettoriale del centro abitato ...
> altrimenti la mia domanda non avrebbe senso.
>
> Vi viene un idea o suggerimento di come procedere più speditamente,
> rispetto
> alla digitalizzazione a mano ??
>
> Saluti
> Nno
>
> 
>
>
>
> --
> Sent from:
> http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-f5250612.html
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Re: [Qgis-user] qgis 3 on CentOS

[Matthias Kuhn]

Hi Valentin,

Thank you for reporting this. The repository unfortunately no longer
exists and packages for QGIS 3 where never available there. The link
will be removed from the download page.

I am not sure if there is an alternative repository that offers it.

The situation with CentOS is often complicated because it has a long
lifetime and libraries used by QGIS are often old and outdated. I think
it *should* be possible to get it up and running with someone who is
able to compile, but if you have a choice, I would recommend to use
another distribution with Qt 5.10 or newer.

All the best
Matthias

On 08/02/2018 07:35 PM, Valentin wrote:
> I'm trying to install qgis on CentOS 7. I followed instruction on qgis
> download page however the repository (fedora.vitu.ch
> ) seem to be broken.
> 
> I made :
> 
> sudo wget fedora.vitu.ch/EL/qgis.repo -P /etc/yum.repos.d/
> 
> then this error message appear :
> 
> Resolving fedora.vitu.ch  (fedora.vitu.ch
> )... failed: Name or service not known
> 
> wget: unable to resolve host adress âfedora.vitu.châ
> 
> 
> Any way to fix it or any alternative repository from where i can
> download qgis for CentOS ?
> 
> Valentin
> 
> ‌
> 
> 
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Re: [QGIS-it-user] Poligonizazzione complicata

[Carlo Tersigni]

Non vorrei sbagliare, ma scaricando direttamente OpenStreetMap si ricavano
informazioni e planimetrie non solo sulle strade, ma anche sugli edifici
delle città. MI è capitato di scaricare il file per la mia città e faticai
non poco per togliere gli edifici, visto che a me interessavano solo le
strade e le aree verdi. Quando dico scaricando direttamente, intendo
direttamente da QGIS (Vettore --> OpenStreetMap --> Download dati). Prova,
magari su un'area piccola. Se è come ricordo, ti faciliterà di molto il
compito.
Ciao
Carlo

Il giorno 3 agosto 2018 09:40, nformica  ha scritto:

> Digitalizzare una mappa raster è sempre una rogna o comunque un lavoro
> lungo
> !!
> Devo ricavare i poligoni che rappresentano gli isolati (o edifici) di un
> centro urbano da una mappa raster di cui vi allego un esempio.
>
> Fare tutto i lavoro a mano (digitalizzare i poligoni) richiede un sacco di
> tempo, perchè la mappa è grande.
>
> Il tool QGIS di poligonizzazione dei raster non va bene perchè come vedete
> nell'allegato il riempimento dei poligoni e fatto di tante lineette e poi
> nella mappa ci sono tanti altri tratti grafici oltre gli isolati.
>
> Manco a dire che non ho a disposizione il vettoriale del centro abitato ...
> altrimenti la mia domanda non avrebbe senso.
>
> Vi viene un idea o suggerimento di come procedere più speditamente,
> rispetto
> alla digitalizzazione a mano ??
>
> Saluti
> Nno
>
> 
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Italian-User-
> f5250612.html
> ___
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>



-- 
*Carlo TERSIGNI*
*Via Padre Semeria, 6300154 - ROMA*

*tel.: 333-4653589e-mail: carter@gmail.com *
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[QGIS-it-user] Poligonizazzione complicata

[nformica]

Digitalizzare una mappa raster è sempre una rogna o comunque un lavoro lungo
!!
Devo ricavare i poligoni che rappresentano gli isolati (o edifici) di un
centro urbano da una mappa raster di cui vi allego un esempio.

Fare tutto i lavoro a mano (digitalizzare i poligoni) richiede un sacco di
tempo, perchè la mappa è grande.

Il tool QGIS di poligonizzazione dei raster non va bene perchè come vedete
nell'allegato il riempimento dei poligoni e fatto di tante lineette e poi
nella mappa ci sono tanti altri tratti grafici oltre gli isolati.

Manco a dire che non ho a disposizione il vettoriale del centro abitato ...
altrimenti la mia domanda non avrebbe senso.

Vi viene un idea o suggerimento di come procedere più speditamente, rispetto
alla digitalizzazione a mano ??

Saluti
Nno

 



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