March 2010 - mkgmap-dev - The mkgmap lists

Patch to reduce memory usage by interning strings.
by Scott A Crosby 02 Apr '10

02 Apr '10

I noticed that mkgmap does not intern any strings. In particular, this tile, generated by the splitter, fails to build with -Xmx3000m on 64-bit jdk under linux. With my patch, mkgmap generates the tile with -Xmx1000m. <bounds minlat='55.1953125' minlon='9.4921875' maxlat='56.6015625' maxlon='11.513671875'/> This tile has 1m nodes. Among the nodes and ways on this tile, there are 12m tags, yet only 100k distinct tag key/value pairs; on average each value occurs 120 times. I explicitly do not use normal string interning because String.intern() strings are kept forever, and I want these strings to be GC'able after the tile is done. I trade GCability for having the occasional string duplicated in memory by flushing the interning table every 10k unique strings. This code is not presently multithread safe; Ideally there should be one string interning table for each parser/thread. Scott

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State of the coastline art
by NopMap 02 Apr '10

02 Apr '10

Hi! I am working on sea polygons once again. After reading through the many generate-sea-related topics I am still not sure what the current state of the art is on the matter. - What is the current recommended command line option/combination that works for you? What other techniques do you need? I have e.g. read about manual adjustions to the data in some posts. Or did it not work for your area at all? - What level of confidence do you achieve with generate sea? Many posts still mention minor failures, disappearing islands etc. - Is it possible to save the resulting sea/land polygons for later re-use? Apparently the OSM data changes more frequently than the actual coastline and re-generating it from scratch every time you update is not necessary. It would be helpful to keep the sea data around, especially if you had to do manual adjustments to create it. But I have not read about such a feature. Did I miss something? thanks Nop -- View this message in context: http://n2.nabble.com/State-of-the-coastline-art-tp4829364p4829364.html Sent from the Mkgmap Development mailing list archive at Nabble.com.

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--keep-going ?
by Chris-Hein Lunkhusen 31 Mar '10

31 Mar '10

Hi, I don't see the --keep-going option working in the recent versions of mkgmap. When there is a .NET1 overflow mkgmap stops complete.... mkgmap 1624 OS:XP Chris

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Roundabout processing suggestion
by Toby Speight 31 Mar '10

31 Mar '10

Sometimes I see roundabouts where the mapper has used the same node for an exit as for an entry. This means that exit counting is off by one when approaching by that entry. Is it possible for mkgmap to warn when this is the case? Even better if it could minimally separate the two, at least in the routing layer.

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Shuttle-Train
by Chris-Hein Lunkhusen 31 Mar '10

31 Mar '10

Hi, The german island Sylt can only be reached (for cars) on the shuttle train (www.syltshuttle.de) So for now our maps can't route to sylt, because we don't route over railway=rail (even if it's tagged with motorcar=yes). If I look to my Nüvi with Garmin City-Navigator Map, the way looks different than a normal rail-line, so garmin seems to have a special data type for this kind of connection. So, how to handle this? Should we add a rule to the default style to route cars over railway=rail if it is tagged additionaly with motorcar=yes ? Chris

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Generate coastline - can we keep the coastline way?
by Toby Speight 31 Mar '10

31 Mar '10

When --generate-coastline=multipolygon fails, I'm left with a map that has no distinction between land and sea. However, if I don't use --generate-coastline, I at least get a line (from my style/lines). Is there any good reason why generating coastline prevents the line rules from being applied to the coastline ways? It's not a problem when I actually get sea tiles, but it's a serious nuisance when small islands have completely disappeared!

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Re: [mkgmap-dev] problems with display of streetname labels
by Minko 29 Mar '10

29 Mar '10

To add a note to my former question: I found out that if I don't fill in the extended labels from the lines/ways in the TYP file, the display of street names on the mentioned GPS units are ok. If I put some of them on invisible, all the streetnames disappear. I also put the question on the ati.land.cz discussion list.

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Incorrect multipolygon warnings?
by Charlie Ferrero 28 Mar '10

28 Mar '10

Hi, Whilst processing Italy, I've been getting a lot of mp warnings like: 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: Polygon 4611686018427439638 intersects itself. It is splitted into 2 polygons. 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: The polygon is composed of 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: - http://www.openstreetmap.org/browse/way/36433060 I can't see anything wrong with this mp and the JOSM validator does not pick up on anything. Is this an error with mkgmap's MP code or am I missing something? Here's another: 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: Polygon 4611686018427439886 intersects itself. It is splitted into 2 polygons. 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: The polygon is composed of 2010/03/27 13:57:27 WARNING (MultiPolygonRelation): 63242013.osm.gz: - http://www.openstreetmap.org/browse/way/36434237 -- Charlie

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Boundary Lines
by Chris-Hein Lunkhusen 28 Mar '10

28 Mar '10

Hi, I see in Mapsource many boundary lines which are not existing in the OSM data. See attached screen shot. Are these lines coming from the multipolygon processing? Data is from the geofabrik germany extract. Chris

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expression test !=
by Torsten Leistikow 28 Mar '10

28 Mar '10

Moin, in the Wiki the != test is described as follows: highway!=motorway This will be true when the highway tag exists, but it does NOT have the value motorway. >From my understanding this should read like highway!=motorway This will be true when the highway tag exists, but it does NOT have the value motorway, or when there is no highway tag at all. Shall I correct the description in the Wiki or must I correct my understanding of the != test? Gruss Torsten

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