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<div dir="ltr" data-setdir="false">Hi Byron,</div><div dir="ltr" data-setdir="false"><br></div></div><div id="ydpae1f2bbyahoo_quoted_5245723676" class="ydpae1f2bbyahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div><div dir="ltr" data-setdir="false">With respect to snapping, there are several types of snapping that can be enabled, e.g. vertex, segment, etc., you also need to make sure that snapping is set for the layer you are trying to snap to. When digitizing I like to use the Snapping Toolbar (V<span><span style="color: rgb(38, 40, 42); font-family: Helvetica Neue, Helvetica, Arial, sans-serif;">iew: Toolbars: Snapping Toolbar</span></span>) instead of the preferences. The left/topmost icon in the toolbar is "Enable Snapping" (a red bar magnet with white tips), make sure it is on when you try to snap, you should then see magenta squares when hovering over vertices and "x"s over segments, etc.. If you do not see these then check the layer snapping settings using the second icon from the left or top in the toolbar. </div><div dir="ltr" data-setdir="false"> </div><div dir="ltr" data-setdir="false">With respect to making contours, you can make a DEM from points using any of the many different interpolation tools from the different providers available in QGIS. Then from the DEM you can make contours. </div><div dir="ltr" data-setdir="false">A good place to start is with one of the GDAL Grid tools (Raster:Analysis:Grid there are 4 of them), </div><div dir="ltr" data-setdir="false"><a href="https://docs.qgis.org/3.16/en/docs/user_manual/processing_algs/gdal/rasteranalysis.html#gdalgridaverage" rel="nofollow" target="_blank">https://docs.qgis.org/3.16/en/docs/user_manual/processing_algs/gdal/rasteranalysis.html#gdalgridaverage</a><br></div><div dir="ltr" data-setdir="false">Why are there so many different Grid tools? You may want to read this about GDAL which QGIS is using for this:</div><div dir="ltr" data-setdir="false"><a href="https://gdal.org/tutorials/gdal_grid_tut.html" rel="nofollow" target="_blank">https://gdal.org/tutorials/gdal_grid_tut.html</a><br></div><div dir="ltr" data-setdir="false">After you get a DEM that you like convert it to contours using Raster:Extraction:Contour, or just change the symbology of the raster </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Note that you may also want to try the GRASS tools to do the same thing.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">-Thayer</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr">----------------------------------------------------------------------</div><div dir="ltr">Date: Thu, 14 Oct 2021 09:41:30 -0600<br></div><div dir="ltr">From: Firstname Lastname <<a href="mailto:byron@conjugategeo.com" rel="nofollow" target="_blank">byron@conjugategeo.com</a>><br></div><div dir="ltr">To: <a href="mailto:Qgis-user@lists.osgeo.org" rel="nofollow" target="_blank">Qgis-user@lists.osgeo.org</a><br></div><div dir="ltr">Subject: [Qgis-user] two items for help<br></div><div dir="ltr">Message-ID:<br></div><div dir="ltr"> <CAAyYZQK9MiubL97s3vC=H12FrbMu-ycYM+<a href="mailto:RrU-mv2HnxExnERA@mail.gmail.com" rel="nofollow" target="_blank">RrU-mv2HnxExnERA@mail.gmail.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">First, in settings, options, digitizing: i have clicked on 'enable<br></div><div dir="ltr">snapping by default.' when i am digitizing polygons, the snapping does not<br></div><div dir="ltr">seem to be engaged. i have set the snapping tolerance to 13 pixels. does<br></div><div dir="ltr">anyone know why the snapping does not work? i assume that these are the<br></div><div dir="ltr">correct settings for snapping to polygons.<br></div><div dir="ltr"><br></div><div dir="ltr">second. i have imported several elevation model files into qgis. they<br></div><div dir="ltr">come in as x,y,z, elevation points. the original files are of the type:<br></div><div dir="ltr">GDBINDEXES, GDBTABLE FILE, GDBTABLX, and SPX. can someone help me with a<br></div><div dir="ltr">workflow for gridding and contouring these elevation files so that they<br></div><div dir="ltr">look like either a contoured topo map or density contoured DEM.<br></div><div dir="ltr"><br></div><div dir="ltr">-- <br></div><div dir="ltr">Byron Veilleux, MSc. P.Geo<br></div><div dir="ltr">Conjugate Geologic Services Limited<br></div><div dir="ltr">Calgary, Alberta Canada<br></div><div dir="ltr"><a href="mailto:byron@conjugategeo.com" rel="nofollow" target="_blank">byron@conjugategeo.com</a><br></div><div dir="ltr">Cell:4037108414<br></div><div dir="ltr"><br></div><div dir="ltr"><<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" rel="nofollow" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail</a>><br></div><div dir="ltr">Virus-free.<br></div><div dir="ltr">www.avast.com<br></div><div dir="ltr"><<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail" rel="nofollow" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail</a>><br></div><div dir="ltr"><#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="http://lists.osgeo.org/pipermail/qgis-user/attachments/20211014/f6ee5e0f/attachment-0001.html" rel="nofollow" target="_blank">http://lists.osgeo.org/pipermail/qgis-user/attachments/20211014/f6ee5e0f/attachment-0001.html</a>><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------</div></div>
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