Re: [Qgis-user] Reselect Features
Thank you for your reply, Andrea. I'll be glad to describe the situation and what I'm doing. I'm running Qgis 3.23.3 for Windows (Windows 11), which is the regular environment I'm now working Qgis in – though earlier I also tried 3.23.2 on MacOS (the latter of which – Qgis for MacOS – I now believe to be a less refined and less finished variety of Qgis, similar version number or no). For my particular project at present (a map I'm preparing of Roman Britain), I'm adding rivers to the map – drawing data from a shapefile of the "waterways" (rivers, creeks, canals, ditches, etc.) of the island of Britain (containing something like 190,000 features!), distributed by the U.K. government. The procedure I've found most convenient at present for doing so (excepting the interference of the problem being discussed) is to copy the original shapefile to the name of the desired river, load it as a layer, open its Attributes Table, turn on Editing, sort the table by name, select all features bearing the right river name, then (after selecting the Select Features by Area or Single Click tool) scan through the segments and features of the intended river: 1) deselecting the segments of a different river possessing the same name (there are many such in Britain), 2) deselecting side segments which incorrectly bear your intended river's name (also a lot), 3) selecting incorrectly named segments (e.g., NULL) that if omitted would introduce gaps in the line of the river, 4) adding to the selection creeks possessing a different name, and so forth. Finally, invert the selection, delete all the features one didn't select in the process above, then save. It all works well – until the eventual moment when one's pressed shift or control key momentarily fails to register, the entire laboriously selected set of features clears back to just the last one touched – and I pull out even more of my remaining hair. Nor does saving the layer every now and then in the middle of the process do any good – because what features are selected or not at that instant doesn't get remembered in the save file. This is the moment when it would be exceedingly nice if one could just pull down Edit > Select > Reselect Features and thereby get back to the last previous selected set of features as they existed just prior to the last keystroke/click entered. But that command appears to do nothing. (Thanks again for your response!) Best, Michael McNeil > On Nov 16, 2023, at 16:33, Andrea Giudiceandrea via QGIS-User > wrote: > > >> >> Michael Edward McNeil memcneil02 at gmail.com >> Thu Nov 16 16:04:37 PST 2023 > >> Why doesn't the Edit > Select > Reselect Features command work? > > Hi Michael, > it seems to me the command works as expected [1], at least using QGIS 3.28 on > Windows. > > May you provide a detailed list of steps that lead to such command to not > work properly? > > Best regards. > > Andrea > > [1] > https://docs.qgis.org/3.28/en/docs/user_manual/introduction/general_tools.html#selecting-manually-on-the-map-canvas > ___ > QGIS-User mailing list > QGIS-User@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Reselect Features
Why doesn't the Edit > Select > Reselect Features command work? I've lost so many complex selections because a) either my finger slipped, or the shift or control key didn't function for an instant – together with b) whereby I can't recover the lost selection with the foregoing command, as (from what I've read) it's supposed to. (Reselect Features, in my experience, doesn't function properly on either MacOS or Windows.) As an alternative, by the way, to this delicate situation where work can be lost at an accidental keystroke, why not add an "Add mode" and "Subtract mode" where (till changed) all selections are either one or the other, and not (by default) the type of keystroke that, at a stroke, will obliterate a long selection process. Michael McNeil ___ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] QGIS-User Digest, Vol 211, Issue 21
That did it! Now I can find and see my data when I reenter QGIS. Many thanks, Garth. Best, Michael McNeil > On Sep 13, 2023, at 12:37, Garth Fletcher via QGIS-User > wrote: > > I've run into a similar problem (possibly the same) - that nothing shows > because the layed is panned far away from screen center. Something to do with > the Project not correctly storing the canvas center coords... > > select one of your layers and then View >> Zoom to Layer(s) > > That will adjust Zoom and Pan to center and display the layer in the > display... > Best to select one of your layers that only contains stuff from your Area of > Interest > if you select some huge background layer then you will be zoomed far enough > out to display the entire layer... > > Michael Edward McNeil wrote: >> ... >> A secondary issue, by the way, is that I apparently can't see the data after >> I save my QGIS project, close and re-enter the app. After re-entering QGIS >> the Layers pane shows all the layers, all properly check-marked for >> visibility, just like before, but nothing shows up in the display window ? >> it's totally blank white. So? I'm surviving by never (or seldom ? then >> reloading the data) leaving the app. But, what's going on? >> >> I'm running QGIS v. 3.32.2-Lima under MacOS 12.6.8. > > -- > Garth Fletcher, > > ___ > QGIS-User mailing list > QGIS-User@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] Output to pdf file doesn't contain vector details
Chris, I could experiment with QGIS's cartography capabilities more if I could save my project, exit, and then resume working on it later. My other problem with QGIS interferes with that potential procedure.Yes, aligning a single layer in another app with its true position is a problem. If I continue trying to do it this way, I'd probably also output meridians and possibly other clues (e.g., the British coastline) to allow aligning it properly.Thanks for your perspective!Michael McNeilOn Sep 13, 2023, at 10:06, chris hermansen wrote:Michael and list,On Wed, Sep 13, 2023 at 10:00 AM Michael Edward McNeil via QGIS-User <qgis-user@lists.osgeo.org> wrote:I'm an almost total novice with regard to GIS in general and QGIS in particular. Nonetheless I've been attempting to put together a test map (using data I will make use of, in part) utilizing the contour lines for the island of Great Britain – obtaining data in that regard from the space shuttle's worldwide Shuttle Radar Topography Mission (SRTM). I obtained the data and loaded it into QGIS, no problem. After extracting the contours, the lines shown in QGIS are nice and sharp, and vectorize properly when zooming in and out. I'm using 100 meters between lines (rather than the default 10 m) which means that in some regions of the planet, they're not all that dense; nonetheless if you're looking at a larger scale view of, say, Wales or Scotland, the contour lines show up at that scale as generally pretty dense. The solution, of course, using vector graphics is to zoom in, then you can see the full detail. Anyway, things are fine while still within QGIS (except for the secondary issue noted below). However, I wanted to output the vectorized contour lines into a file I could input into (e.g.) CorelDRAW to add other layers and do the graphical finishing touches on the desired map. I tried svg format – got the message about svg handling in QGIS being buggy – and indeed the svg output didn't seem to work.Is there any reason you can't do your cartography within QGIS? Or at least, make a "simplified" draft map, save as an image or PDF, and then do whatever "graphical finishing" required in your desktop publishing application? I think this would be a more "normal" approach, rather than exporting a layer by itself, if for no other reason than your geospatial information will be properly aligned by QGIS in the final product.-- Chris Hermansen · clhermansen "at" gmail "dot" comC'est ma façon de parler. ___ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Output to pdf file doesn't contain vector details
I'm an almost total novice with regard to GIS in general and QGIS in particular. Nonetheless I've been attempting to put together a test map (using data I will make use of, in part) utilizing the contour lines for the island of Great Britain – obtaining data in that regard from the space shuttle's worldwide Shuttle Radar Topography Mission (SRTM). I obtained the data and loaded it into QGIS, no problem. After extracting the contours, the lines shown in QGIS are nice and sharp, and vectorize properly when zooming in and out. I'm using 100 meters between lines (rather than the default 10 m) which means that in some regions of the planet, they're not all that dense; nonetheless if you're looking at a larger scale view of, say, Wales or Scotland, the contour lines show up at that scale as generally pretty dense. The solution, of course, using vector graphics is to zoom in, then you can see the full detail. Anyway, things are fine while still within QGIS (except for the secondary issue noted below). However, I wanted to output the vectorized contour lines into a file I could input into (e.g.) CorelDRAW to add other layers and do the graphical finishing touches on the desired map. I tried svg format – got the message about svg handling in QGIS being buggy – and indeed the svg output didn't seem to work. So, I tried pdf. What I get there (out of an 80 GB resulting pdf file!) is simply solid color – not distinguishable contour lines – in regions where the lines would otherwise (at a larger scale) be dense. I told the output Layout page that it should vectorize all output – but zooming in doesn't help. (I recall that my svg format experiment also similarly produced solid color and lacked contour detail.) What am I doing wrong? A secondary issue, by the way, is that I apparently can't see the data after I save my QGIS project, close and re-enter the app. After re-entering QGIS the Layers pane shows all the layers, all properly check-marked for visibility, just like before, but nothing shows up in the display window – it's totally blank white. So… I'm surviving by never (or seldom – then reloading the data) leaving the app. But, what's going on? I'm running QGIS v. 3.32.2-Lima under MacOS 12.6.8. Thanks, all. Best, Michael McNeil ___ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
