[Qgis-user] Square Buffer
I apologize for posting what I think should be a simple task but I am stumped. I would like to create a 15 km square Buffer around a point for establishing a study site. I have used the buffer tool and set it to square and used 7.5 km as the distance. The buffer that is created is not square but instead is a longer on one set of sides. Again I apologize for bothering people with this ... thank you in advance for your help Mike * Michael Jabot, Ph.D. SUNY Distinguished Professor, Science Education US Partner - NASA 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 * ___ 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] Square Buffer
Oops, including the list. Also, having now written the response and re-read your question, I would guess that the coordinate system you are using is causing the distortion you see in the result. I'd be curious to see what others on the list might suggest as the best option for crs as I think even state plane would be distorted at least a little. ---‐-- Hi, not in front of my computer so I can't test but I would recommend first, creating a round buffer with a diameter equal to the square side you are looking for, and then second, using the "extent" tool that's in one of the vector tools subcategories to extract the layer extent, creating the square you need. That should create a "square" although, importantly, the idea of a square in the gis world is a little fraught as the coordinate system you are using can sometimes produce odd results. I would, at a minimum, use the measure tool to double check that what looks like a square truly has a height equal to its width. On Sat, Sep 30, 2023, 2:39 PM Michael Jabot via QGIS-User < qgis-user@lists.osgeo.org> wrote: > I apologize for posting what I think should be a simple task but I am > stumped. > > I would like to create a 15 km square Buffer around a point for > establishing a study site. > > I have used the buffer tool and set it to square and used 7.5 km as the > distance. The buffer that is created is not square but instead is a longer > on one set of sides. > > Again I apologize for bothering people with this ... thank you in advance > for your help > > Mike > > > * > > Michael Jabot, Ph.D. > SUNY Distinguished Professor, Science Education > > US Partner - NASA 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 > * > > > ___ > 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] Square Buffer
Hugh THANK YOU so much!! You were correct about the distortion. When I checked the length of sides with the measure tool (which I didn't do before) it was a square I also switched the coordinate system which also helped THANK YOU again!! Mike * Michael Jabot, Ph.D. SUNY Distinguished Professor, Science Education US Partner - *NASA 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 Sat, Sep 30, 2023 at 2:58 PM Hugh Kelley wrote: > Oops, including the list. > > Also, having now written the response and re-read your question, I would > guess that the coordinate system you are using is causing the distortion > you see in the result. > > I'd be curious to see what others on the list might suggest as the best > option for crs as I think even state plane would be distorted at least a > little. > > ---‐-- > > Hi, not in front of my computer so I can't test but I would recommend > first, creating a round buffer with a diameter equal to the square side you > are looking for, and then second, using the "extent" tool that's in one of > the vector tools subcategories to extract the layer extent, creating the > square you need. > > That should create a "square" although, importantly, the idea of a square > in the gis world is a little fraught as the coordinate system you are using > can sometimes produce odd results. > > I would, at a minimum, use the measure tool to double check that what > looks like a square truly has a height equal to its width. > > On Sat, Sep 30, 2023, 2:39 PM Michael Jabot via QGIS-User < > qgis-user@lists.osgeo.org> wrote: > >> I apologize for posting what I think should be a simple task but I am >> stumped. >> >> I would like to create a 15 km square Buffer around a point for >> establishing a study site. >> >> I have used the buffer tool and set it to square and used 7.5 km as the >> distance. The buffer that is created is not square but instead is a longer >> on one set of sides. >> >> Again I apologize for bothering people with this ... thank you in advance >> for your help >> >> Mike >> >> >> * >> >> Michael Jabot, Ph.D. >> SUNY Distinguished Professor, Science Education >> >> US Partner - NASA 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 >> * >> >> >> ___ >> 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