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Hi Gerard,<br>
you can check the elevation contour lines by opening the file
generated by your tool in e.g. JOSM (my take some time when the file
is large).<br>
Strange distortions are expected at the borders of the whole set of
input files, but not where input files are adjacent to each other.<br>
Your description seems to hint to a bug when crossing the
0°-meridian. I do not know how srtm2osm reacts there, it might be
worth to try it.<br>
<br>
Kind regards,<br>
Bernhard<br>
<br>
<div class="moz-cite-prefix">Am 10.03.2022 um 14:15 schrieb Gerard
CATTIAUX:<br>
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<p class="MsoNormal"><span lang="EN-GB">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">After many hours of time
to get a correct knowledge of the most important tools
needed to produce Garmin map, like mkmap, Splitter.. and
plenty of hours to develop my own Styles files for mkgmap, I
am now able to produce local maps mainly for Fenix 6x or
Garmin 66, specifically for Trail Running.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">That help me also to
have a mean to verify immediately all my contributions to
OSM database.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To have the best results
for my personal maps, I use altitude data from Sonny. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><a
moz-do-not-send="true"
href="https://data.europa.eu/data/datasets/dtm-europe?locale=en"><a class="moz-txt-link-freetext" href="https://data.europa.eu/data/datasets/dtm-europe?locale=en">https://data.europa.eu/data/datasets/dtm-europe?locale=en</a></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">For flat part of the
country, I generally generate contour lines with a 5m space,
in lieu of a 10m or 20m space between contours lines.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">That choice seems for me
a very good choice for as an example "Ile de France"
(Extended Region around Paris), where max altitude are
between 150 to 200m.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I recently generate
contourlines near La Rochelle in France for a local zone
called "Poitou-Charentes",<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><a
moz-do-not-send="true"
href="http://download.geofabrik.de/europe/france/poitou-charentes.html"><a class="moz-txt-link-freetext" href="http://download.geofabrik.de/europe/france/poitou-charentes.html">http://download.geofabrik.de/europe/france/poitou-charentes.html</a></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">but unfortunately, I
have artefacts, that I don't have for example in many other
regions of France.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">These artefacts are also
visible for 5m, 10m and 20m space between contours lines.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">These "artefacts" are
described in the pdf files given at this link:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><a
moz-do-not-send="true"
href="https://drive.google.com/file/d/1uiA51R4Kd_WYsdeTrEtevu2jJ_8aPinH/view?usp=sharing"><a class="moz-txt-link-freetext" href="https://drive.google.com/file/d/1uiA51R4Kd_WYsdeTrEtevu2jJ_8aPinH/view?usp=sharing">https://drive.google.com/file/d/1uiA51R4Kd_WYsdeTrEtevu2jJ_8aPinH/view?usp=sharing</a></a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">To generate my contour
lines, I use mainly hgt2osm, with hgt files from Sonny.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Hgt files in the example
: <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N46W002.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N46W001.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N46E000.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N45W002.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N45W001.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">N45E000.zip<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Command line<o:p></o:p></span></p>
<p class="MsoNormal">hgt2osm -g HGT-AFAIRE --MinorDistance=10<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Hgt2Osm, 13.11.2017,
FSofT<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">64 Bit-OS: ja<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Programmodus 64 Bit: ja<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">MinorDistance:
10<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">MediumFactor:
5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">MajorFactor:
5<o:p></o:p></span></p>
<p class="MsoNormal">HGT-Verzeichnis: HGT-AFAIRE<o:p></o:p></p>
<p class="MsoNormal">Mergefile:<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">OutputOverwrite:
False<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Höhenkorrektur:
-0.5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">MinVerticePoints:
3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">MinBoundingbox:
0.0005<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Douglas-Peucker:
0.04<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">1. OSM-ID:
-1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">mit OSMBound:
False<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">mit OSMBounds:
True<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">mit OSMTimestamp:
True<o:p></o:p></span></p>
<p class="MsoNormal">mit OSMVersion: 1<o:p></o:p></p>
<p class="MsoNormal">mit OSMVisible: False<o:p></o:p></p>
<p class="MsoNormal">max. Punktanzahl je Weg: 500<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">mit 'contour_ext'-Tag:
True<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">At first sight, it seems
that all these artefacts begin just near a vertical line
situated at W0° 00' 00" / E0° 00' 00" <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Any ideas to helps me to
solve the problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Many thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Gerard Cattiaux<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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