<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">Hi Wayne, Good question. I've tried both methods. </div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">Simple polygons with overlapping ways are very easy to understand.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">Multiple polygon relations sharing common ways might work better for folks who think faster than me but I find them hard to understand. </div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">Take a look at Mass Audubon in Wellfleet <a href="https://www.openstreetmap.org/way/29848715#map=15/41.8792/-69.9921" style="font-family:Arial,Helvetica,sans-serif;font-size:small" target="_blank">https://www.openstreetmap.org/way/29848715#map=15/41.8792/-69.9921</a> where I used multi polygon relations for all types tidal flats, wetlands, woods, beaches etc. It gives me a headache just to trying to understand what I did.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">I think it's better to keep it simple and only use multipolygons when you need to put something inside something else.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif;font-size:large">Alan</div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 31, 2019 at 3:48 PM Wayne Emerson, Jr. via Talk-us-massachusetts <<a href="mailto:talk-us-massachusetts@openstreetmap.org" target="_blank">talk-us-massachusetts@openstreetmap.org</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 bgcolor="#FFFFFF">
<p>In this weeks OSM weekly roundup <a href="http://weeklyosm.eu/archives/12467" target="_blank">http://weeklyosm.eu/archives/12467</a>
there is this quote, "<span style="color:rgb(0,0,0);font-family:"Open Sans",sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Adam Franco created two videos about
working with multipolygons using JOSM. The<span>??</span></span><a href="https://www.openstreetmap.org/user/Adam%20Franco/diary/390981" target="_blank">first one</a><span style="color:rgb(0,0,0);font-family:"Open Sans",sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span>??</span>is
about creating multipolygons for adjoining areas with shared
ways. Please note that this type of mapping is being discouraged
in many parts of the world."</span></p>
<p><span>I wasn't sure
which type of mapping was being discouraged. So for example if
we have a swamp bordering a salt marsh, which is bordering a
tidal flat, should we have 3 polygons with overlapping lines
& shared nodes, or do we make them into multipolygon
relations? <br>
</span></p>
<p><span>Thanks,</span></p>
<p><span>-Wayne /
OSM:Rassilon<br>
</span></p>
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