<div dir="ltr">the problem is at some points - that the lines interchange at resolution 23. I know the main problem is phyghtmap. Groundtruth and gnuplot with b-spline interpolation can do this much better. But at resolution 24 still never lines intersect, at resolution 23 they do.<div>(the commenting of the wrong angle fixer didn't seem to help or change anything - I have to compare tomorrow again however. Just locked myself out of my compile server somehow entering the password wrong too often). </div><div>Yes very steep and 10m equidistance which is not suited for such steep slopes - but it's possible to create much better contourlines (as seen from the contourlines on <a href="http://kleineisel.de">kleineisel.de</a> - they never intersect also at resolution 23).</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 23 Apr 2021 at 21:38, John Thorn <<a href="mailto:johnrthorn@gmail.com">johnrthorn@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>I don't think this can be improved.</div><div><br></div><div>As I understand it, internally Garmin devices hold coordinates in the number of bits specified in the level.</div><div><br></div><div>So 24 bits has a resolution of 2.4 metres, 23 bits has a resolution of 4.8 meters and so on. If you look carefully, all the vertices of the lines lie on a square grid.</div><div><br></div><div>Having said that, that must be a very steep slope - unless something else is creating the granularity.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 23 Apr 2021 at 12:06, <<a href="mailto:mkgmap-dev-request@lists.mkgmap.org.uk" target="_blank">mkgmap-dev-request@lists.mkgmap.org.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send mkgmap-dev mailing list submissions to<br>
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Today's Topics:<br>
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1. Resolution 23 raster problems (Felix Hartmann)<br>
<br><br><br>---------- Forwarded message ----------<br>From: Felix Hartmann <<a href="mailto:extremecarver@gmail.com" target="_blank">extremecarver@gmail.com</a>><br>To: Development list for mkgmap <<a href="mailto:mkgmap-dev@lists.mkgmap.org.uk" target="_blank">mkgmap-dev@lists.mkgmap.org.uk</a>><br>Cc: <br>Bcc: <br>Date: Fri, 23 Apr 2021 18:01:15 +0800<br>Subject: [mkgmap-dev] Resolution 23 raster problems<br><div dir="ltr"><div dir="ltr"><div dir="ltr">Any ideas why this is happening?<div>Some of the contourlines intersect each other at resolution 23 - I especially used reduce-point-density=1.0 to try to stop it.</div><div><br></div><div><div>java -jar -Xmx47000M /home/contourlines/mkgmap.jar --keep-going --dem-poly=/home/contourlines/bounds/bayern.poly --series-name=openmtbmap-cntrs-DBY-23-Apr-2021 --dem=/home/contourlines/hgt/VIEW1/,/home/contourlines/hgt/SRTM1v3.0,/home/contourlines/hgt/VIEW3/,/home/contourlines/hgt/SRTM3v3.0/ --dem-dists=5520 --max-jobs=7 --reduce-point-density=1 --transparent --style-file=srtm24 --latin1 95260000.osm.pbf </div><div><br></div><div>Is there any way to improve this?</div><div><br></div><div>Look at the screenshots - the small one is resolution 23, the big one 24. If using 10m interval contourlines this is pretty obviously not ideal. Resolution 24 could be nicer - but I guess this is more a problem of phyghtmap (while groundtruth can produce higher quality), but resolution 23 really becomes confusing vs 24...:</div><div><img src="cid:ii_knu52l9m0" alt="Simplification_23.PNG" width="364" height="270"></div><div><img src="cid:ii_knu52l9x1" alt="Oiginal_24.PNG" width="562" height="471"><br></div><div><br></div><div>If pictures don't show </div><div><a href="https://openmtbmap.org/23.PNG" target="_blank">https://openmtbmap.org/23.PNG</a></div><div><a href="https://openmtbmap.org/24.PNG" target="_blank">https://openmtbmap.org/24.PNG</a><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Felix Hartman - Openmtbmap.org & VeloMap.org<br></div><br></div></div></div></div></div></div></div></div></div></div>
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