[Qgis-user] ctrl-c selection issue
Jeroen Hovens
mail at groenebij.nl
Wed Jan 10 03:26:42 PST 2018
At the moment I make the selection using the Select by expression tool. I then choose one of the Gem2017 values (each object is an address, and has one of 388 unique Gem217 values). I want to select all objects bwith one unique Gem2017 value.
Making the selection is no problem, I can make any selection I want. Making the selection usually takes less then a minute.
The problem is in copying specific selections to the clipboard or saving a selection as a new file. Copying a selection of about 20.000 objects from the 7,5 mln takes about a second. Unless the issue arises, then the copy process takes forever
I have no experience with Postgis or using databases. I tried saving the csv file as a sqlite, but then had no idea how to re-open that file. The dialogbox got me all confused ☹
-----Oorspronkelijk bericht-----
Van: Richard Duivenvoorde [mailto:rdmailings at duif.net]
Verzonden: woensdag 10 januari 2018 10:21
Aan: Jeroen Hovens <mail at groenebij.nl>; 'Ramon Andinach' <custard at westnet.com.au>; 'qgis-user' <qgis-user at lists.osgeo.org>
Onderwerp: Re: [Qgis-user] ctrl-c selection issue
Hi Jeroen,
Loading a csv in QGIS is not optimal. I think csv does not have an index, so when you create a small selection, QGIS has to run over all those 7,5 mln object every time.
Not sure how you do your 'selecting'?
Is it spatial or based on zip/postcode/buurtnr/wijknr?
I think I would either load it in Postgis (if available) or save as GeoPackage (better use QGIS 2.99 for that) or if all fails, create a shapefile for it. AND then create indexes on desired columns.
IF you are searching for strings like zipcodes in that list, I think tools like grep (available in OSGeo4W too!) work best:
Eg searching fro 3 zip codes is milliseconds work:
grep '2022ZJ\|2211ZE\|1016XX' pc6hnr20170801_gwb.csv
If all fails, give me a call.
Regards,
Richard Duivenvoorde
On 10-01-18 00:33, Jeroen Hovens wrote:
> Hmm, I can’t use Edit > Paste As, because qgis does not finish the
> Edit
>> Copy command.
>
>
>
> The csv file is about 270 MB, 7,5 mln objects with 5 attributes, no
> x-y data.
>
> If you want to recreate the issue, the file can be found here:
>
> https://www.cbs.nl/nl-nl/maatwerk/2017/38/buurt-wijk-en-gemeente-2017-
> voor-postcode-huisnummer
>
> I run into this issue when selecting all objects with Attribute Gem217
> = 310
>
> 355 also has this issue. 321 and 356 work without a problem.
>
>
>
> I am using qgis here just as a means to chop the csv file into smaller
> selections which I can then use to edit, add attributes and data to
> and make maps of them.
>
>
>
> Gr.
>
> Jeroen
>
>
>
> *Van:* Qgis-user [mailto:qgis-user-bounces at lists.osgeo.org] *Namens
> *Ramon Andinach
> *Verzonden:* dinsdag 9 januari 2018 23:35
> *Aan:* qgis-user <qgis-user at lists.osgeo.org>
> *Onderwerp:* Re: [Qgis-user] ctrl-c selection issue
>
>
>
> Just so we’ve got just about everything covered, does this happen for
> “Edit-> Paste As”?
>
>
>
> Also looking at the size of your original CSV, I’d go along with
> Jeroen, and try and import that csv into some other format first.
>
> If you can find a way of making the selection without going near the
> attribute table that will help too.
>
>
>
>
>
> Regards,
>
> Ramon.
>
> On 10 Jan 2018, at 06:26, Jeroen Hovens <mail at groenebij.nl
> <mailto:mail at groenebij.nl>> wrote:
>
>
>
> Thanks for the ideas.
>
>
>
> The option to save the selection as new csv file as Ramon suggested,
> doesn’t work; qgis goes into ‘not responding’ and no csv file is
> added to the layer list. However, a csv file is made, lacking a
> decent number of objects (first test 15095 of 18582 objects and
> second test is 15179 of 18582 objects, so missing about 3,5k
> objects). This csv file can be opened manually in qgis.
>
> And I checked: this options does work for selections where the
> ctrl-c option also worked. Then the new cvs layer is added to the
> layer list in no time.
>
>
>
> Is there some sort of log file in qgis that might give clues to the
> ‘not responding?
>
>
>
> @Kirk
>
> I did close and reopen qgis multiple times, even shut down the pc
> entirely, but to no effect. Selections that did allow for copying
> earlier, still work: I can make that selection again and ctrl-c
> works fine. Seems to me this rules out memory-issues.
>
>
>
> Gr.
>
> Jeroen
>
>
>
>
>
> *Van:* Qgis-user
> [mailto:qgis-user-bounces at lists.osgeo.org] *Namens *Kirk Schmidt
> *Verzonden:* dinsdag 9 januari 2018 22:20
> *Aan:* qgis-user at lists.osgeo.org <mailto:qgis-user at lists.osgeo.org>
> *Onderwerp:* Re: [Qgis-user] ctrl-c selection issue
>
>
>
> After a few selections, you may have to close and reopen qgis to
> purge the memory as well. Importing a csv is memory intensive so
> another approach is to try saving as a spatial database (SQLite) or
> even a shapefile. Once written, you can load the spatial file and
> you should have lots of memory to keep selecting points.
>
>
>
> Kirk
>
> On 1/9/2018 4:58 PM, Ramon Andinach wrote:
>
> I’m not sure what the problem is, but if I were doing that
> repeatedly, I’d probably use Layer -> Save As, tick the Save
> Only Selected Features box and save it to CSV. Then muck about
> with excel later.
>
>
>
> This way ought to be a bit lighter on the memory.
>
>
>
>
>
> Ramon.
>
> On 10 Jan 2018, at 04:25, Jeroen Hovens <mail at groenebij.nl
> <mailto:mail at groenebij.nl>> wrote:
>
>
>
> Hi,
>
>
>
> Using qgis 2.14.18 I have been working today with a large
> csv file (7.5 mln objects). I just need selections of this
> database which I can then modify in excel. So I opened the
> attribute table and made a selection based on a specific
> value for an attribute, and copied that selection (about
> 30.000 objects) via the clipboard (ctrl-c) to a new
> Microsoft Excel file, then saved the excel file and repeated
> the process for another selection. This worked perfect for
> some time. However, some selections won’t copy: when I press
> the copy button the programs turn to ‘not responding’ and
> won’t snap out of it anymore. Selection size when this
> happens is about the same (about 20k to 35k objects).
>
>
>
> What could be the problem? Could the data be corrupted? How
> can I check what is wrong?
>
>
>
> Thank you
>
> Gr.
>
> Jeroen
>
>
>
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> --
>
> Kirk Schmidt, MScF, BScF, RPF
>
> General Manager
>
> Nortek Resource Solutions Inc.
>
> RR # 1
>
> Thorburn, NS
>
> B0K 1W0
>
> Tel (902) 922.3607
>
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>
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>
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