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<div dir="ltr">Hi all,<br><br>okay, found the answer. The problem is this:<br>To store a restriction in the img file<br>we have to calculate three nodes (points which are connecting highways).<br>One is the via node (which is also specified in OSM, others are a from node <br>and a to node. If a restriction starts with "no_" this is all we need,<br>but relation 2560683 is starting with "only_" . These only-restrictions are <br>internally converted to no-restrictions for all other roads connected to the <br>via point. That means mkgmap uses the closest node on the excluded ways<br>as the "to" node. <br>In the example, the restriction 2560683 is a<br>"only_right_turn" from way 189568203 to way 189568204 via node 119659814.<br>The calculated from-node is node 119631435 in way 189568203 <br>(the connection in the north), and the to-node is the closest node on way <br>189568204 (search is started from the via node, so the result is node 119659791.<br>The only other way connected to the via node is way 13008519, and the next<br>node on this way (searching again from the via node) is node 119659791.<br>Now that's the problem: The resulting restriction would be a<br>"no_xxx_turn_to" with via-node 119659791 and a to-node 119659791,<br>and that makes no sense, so mkgmap drops it.<br><br>To solve the problem, mkgmap can add or change one point on way 13008519<br>to a node, so that it can store a restriction to that point. <br>In the attached patch I've implemented an algo for this.<br>It is rather complicated, so another alternative would be to change way 13008519 <br>to a one-way road if this special case is detected, but that also seem difficult.<br><br>The patch fixes also a special case in the remove-short-arc routine which might<br>replace a point that was previously stored as the via node. <br><br>Please let me know what you think about it.<br><br>Gerd<br><br>From: gpetermann_muenchen@hotmail.com<br><div>To: mkgmap-dev@lists.mkgmap.org.uk<br>Date: Sun, 15 Dec 2013 12:52:09 +0100<br>Subject: [mkgmap-dev] why is this restriction relation ignored?<br><br>
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<div dir="ltr">Hi,<br><br>while debugging the I found this http://www.openstreetmap.org/relation/2560683<br>
which seems to be ignored by mkgmap.<br>I guess the problem could be that both ways <br><a href="http://www.openstreetmap.org/way/189568203" target="_blank">http://www.openstreetmap.org/way/189568203</a> and <br><a href="http://www.openstreetmap.org/way/189568204" target="_blank">http://www.openstreetmap.org/way/189568204</a> <br>start at the via node?<br><br>Gerd<br> </div>
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