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Using other functions from Geoprocession tool: Intersection and Clip - The new layer come out empty.

Just tried the same functions in 2.8.2 - where they work fine.

Hi Lene,

what is the field to be used for the dissolve? there are many in the table of attributes. Thanks.

Lene Fischer wrote:

Hi Giovanni,
Exampledata added.

Bo Thomsen tried the last build 2.10.1 and 2.11 OSGEO 64 bit (Win 10) - with same result.

Regards
Lene

Try "Regionnavn"

Hi.
I have reported a similar issue using dissolve and if I process my shape file using 2.8.3 everything works, if I process the same file using 2.10.1 it does not work.
Unfortunately I cannot upload the shape file.

Hi,
can you load the layer, make it active and enter in the Python console
iface.activeLayer().wkbType()
What is the result?

Hi Bernhard,

can you load the layer, make it active and enter in the Python console
iface.activeLayer().wkbType()

if I have done it correctly (never used the python console before), my result is 3.

wkbType 3 is a straight polygon layer, different from Lene's and should work (according to what we know until now). If you cannot share the shape file publicly you might want to provide it to me for testing.
Could you describe what your result is or (better) if you already opened a ticket link to it?

Hi Bernhard.
I have tried to reproduce the same error using a sample file but it works!
The file that I use is the Codepoint with Polygons, but they are copyrighted therefore I cannot send you a copy (see: https://www.ordnancesurvey.co.uk/business-and-government/products/code-point-with-polygons.html).

The whole file consist of 1.5 millions features and the shape file is almost 1.4GB.

If it's possible I could run the process again with some LOG or DEBUG options?

This is a really large file, does it work with subsets of polygons (like 100000)
Are you using Processing 2.10.2? Maybe your computer runs out of memory, do you get an error message?

Hi.
I am using 2.10.1.
I have checked yesterday and that was the version available on the website.

The same file, same computer does not run out of memory with 2.8.3, therefore I assume that the new version is at fault (but I could be wrong!).
I don't have any error message, the new shape file is smaller than it should be and if I open it nothing happens.
I can take a screenshot and upload screenshots.
I will try to find the time for testing 100,000 polygons.

I meant the version of the Processing plugin, not QGIS, AFAIK you can update Processing independently of QGIS, although it is shipped with QGIS in the first place
All I konow is that when I install Processing 2.10.2 my recent changes to Dissolve are included. The former Dissolve took ages to run (when you used a dissolve field).

Please try with 100000 (or a selection) and report back.
I will be abroad for two weeks beginning this afternoon, so do not wonder when I do not answer.

Hi.
I have tried a sample using 194997 polygons and they were successfully dissolved into 1342 polygons.
I will try with a bigger sample and let you know when it fails.

ok, could be a memory problem. Are you using a dissolve field? If yes: is it faster than in QGIS 2.8?

Hi.
I am using a dissolve field. Don't know if it is faster than QGIS 2.8, never timed them because it takes around 20/30 mins so I tend to start the process and check once in a while.
Is there a log that I can check and see how long it took?

It should be faster. I tested with ~16000 polygons and the new algorithm takes a blink whereas it used to be minutes before. In processing history it is listed, when a process started. I do not know if there is more logging.

Hi, I did a couple of tests: with 221739 polygons success, with 798145 polygons failure.
I can check the speed of the same process in QGIS 2.8 and QGIS 2.10, but frankly I'm not concerned about it.
Unless I can give you more details or help - I could install a test version of QGIS if needed - I'm not spending more time on it.
To me it's an issue cause by the number of polygons and hopefully you can replicate it easily.

Currently my recent changes are reverted, so in the next version of QGIS Dissolve should behave as in 2.8

Hi.
I have just downloaded and installed 2.12.0 Lyon.
The same layer that I can dissove with 2.8.3 fails in 2.12.0.
In the python panel I had the following error:
2015-10-27T16:06:05 1 Traceback (most recent call last):
File "C:\\PROGRA~1\\QGISLY~1\\apps\\qgis\\python\\plugins\\fTools\\tools\\doGeoprocessing.py", line 309, in run
geos, feature, match, error = self.dissolve(useField)
File "C:\\PROGRA~1\\QGISLY~1\\apps\\qgis\\python\\plugins\\fTools\\tools\\doGeoprocessing.py", line 749, in dissolve
feature.setGeometry(outFeats[k])
TypeError: QgsFeature.setGeometry(QgsGeometry): argument 1 has unexpected type 'NoneType'

The other part of the panel is:
2015-10-27T16:06:05 1 An error has occured while executing Python code:

TypeError: QgsFeature.setGeometry(QgsGeometry): argument 1 has unexpected type 'NoneType'

Traceback (most recent call last):
              File "C:\\PROGRA~1\\QGISLY~1\\apps\\qgis\\python\\plugins\\fTools\\tools\\doGeoprocessing.py", line 309, in run
                geos, feature, match, error = self.dissolve(useField)
              File "C:\\PROGRA~1\\QGISLY~1\\apps\\qgis\\python\\plugins\\fTools\\tools\\doGeoprocessing.py", line 749, in dissolve
                feature.setGeometry(outFeats[k])
            TypeError: QgsFeature.setGeometry(QgsGeometry): argument 1 has unexpected type 'NoneType'

Python version: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)]

QGIS version: 2.12.0-Lyon Lyon, cd9d645

Python Path:

C:/Users/administrator/.qgis2/python/plugins\\processingC:/PROGRA~1/QGISLY~1/apps/qgis/./pythonC:/Users/administrator/.qgis2/pythonC:/Users/administrator/.qgis2/python/pluginsC:/PROGRA~1/QGISLY~1/apps/qgis/./python/pluginsC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\matplotlib-1.3.1-py2.7-win-amd64.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\
ose-1.3.3-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\tornado-4.0.1-py2.7-win-amd64.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\backports.ssl_match_hostname-3.4.0.2-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\certifi-14.05.14-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\bin\\python27.zipC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\DLLsC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\libC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\plat-winC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\lib-tkC:\\PROGRA~1\\QGISLY~1\\binC:\\PROGRA~1\\QGISLY~1\\apps\\Python27C:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packagesC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\PILC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\jinja2-2.7.2-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\markupsafe-0.23-py2.7-win-amd64.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\pytz-2012j-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\win32C:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\win32\\libC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\PythonwinC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\Shapely-1.2.18-py2.7-win-amd64.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\six-1.3.0-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicodeC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\xlrd-0.9.2-py2.7.eggC:\\PROGRA~1\\QGISLY~1\\apps\\Python27\\lib\\site-packages\\xlwt-0.7.5-py2.7.eggC:/Users/administrator/.qgis2//pythonC:\\PROGRA~1\\QGISLY~1\\apps\\qgis\\python\\plugins\\fTools\\tools

Obviously I don't know if that caused the process to fails or is a red herring and the process failed because of memory issues.