Nicolas THANK YOU so much!!!
What an INCREDIBLE community!!! With deepest appreciation!! Mike ************************************* Michael Jabot, Ph.D. Professor, Science Education US Partner - *GLOBE Program* *NASA Earth Ambassador*Director, *Institute for Research in Science Teaching* *Chancellor's Award Recipient for Excellence in Research*The State University of New York at Fredonia 716.320-0189 (Google Voice) ja...@fredonia.edu E250 Thompson Hall 280 Central Avenue Fredonia, NY 14063 ************************************* On Wed, Aug 21, 2019 at 8:52 PM Nicolas Cadieux < nicolas.cadi...@archeotec.ca> wrote: > Hi, > > I figured it out! (Well... you figured it out:) I created a world grid > with 1 degree longitudes. I then densified this grid with the value 10 > 000 (Vector/Geometry tools/densify by count). Then, I selected the > longitude line I wanted to split (-44). I then used the Split with lines > found in processing. Reprojection still gave me those big polygons but > this time, you can select them by clicking slightly right of the > polygons (on the right side of the screen) on the reprojected project. > Then, you can delete the problematic polygons. Results are in the > Google Drive. > > https://drive.google.com/open?id=1eL6ws8Jc-PugMM2gxV79j0k-TGoWcw6B > > Thanks for your help! > > Nicolas > > On 2019-08-21 3:26 p.m., Alex M wrote: > > I had this issue once also, I think the clipping method is the most > > reliable. If I recall the odd/invalid polygons depended on which scale > > of Natural Earth you use. Try downloading a different scale. I remember > > actually trying to fix the polygons and Russia was just too complicated > > to deal with at the time. > > > > This is a common problem anytime you wrap the dateline with world data, > > and you might find more solutions using those search terms. > > > > Thanks, > > Alex > > > > On 8/21/19 11:10, Nicolas Cadieux wrote: > >> Good idea Calvin, > >> Anyone else with a simpler, faster solution? If not, I will try. > >> Nicolas > >> > >>> Le 21 août 2019 à 13:43, C Hamilton <adenacult...@gmail.com> a écrit : > >>> > >>> The way I more or less solved something like this was by pre-clipping > the Natural Earth data at the boundaries of the projection and made two > different vector layers You then will not get the wrap around. If need be > you can shift the longitude of one of layers by 180 degrees and then > attempt to merge the two pieces together. For countries that now have a cut > line down the middle you can then merge the pieces together. It can be time > consuming, but will work. I don't know if there is an easier way. > >>> > >>> Calvin > >>> > >>>> On Wed, Aug 21, 2019 at 1:17 PM Nicolas Cadieux < > nicolas.cadi...@archeotec.ca> wrote: > >>>> Hi, > >>>> > >>>> These are the nasty polygons. I am hoping you will see the image. > >>>> > >>>> <djfpggkfmkkepjkp.jpg> > >>>> > >>>>> On 2019-08-19 12:26 p.m., Nicolas Cadieux wrote: > >>>>> Hi, > >>>>> > >>>>> Trying to help another Qgis user that posted earlier. > >>>>> > >>>>> We have Natural Earth vectorial Data that we what to reproject in > Equal Earth. We want Austria to be in the middle of the map so we created > a Equal Earth Project using custom CRS using +proj=eqearth +datum=WGS84 > +wktext +lon_0=136 with the help of > https://proj.org/operations/projections/eqearth.html. Using lon_0=136 > puts Australia in the middle and limits the distortion in that longitude. > >>>>> > >>>>> Data was reprojected and saved in the new projection (vector/Data > Management tools/Reproject Layer). Project is also in the Equal Earth > projection so no reprojection on the fly is happening behind the scenes. > >>>>> > >>>>> Question: How so we take care of the nasty polygons that appear when > we add the "+lon_0=136" parameter? See the zip. > >>>>> > >>>>> You can find the data here: > https://drive.google.com/open?id=1eL6ws8Jc-PugMM2gxV79j0k-TGoWcw6B > >>>>> > >>>>> Qgis 3.8.1 on Windows 10_64 > >>>>> > >>>>> Thanks > >>>>> > >>>>> Nicolas > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> _______________________________________________ > >>>>> 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 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 > >> > > . > > >
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