April 2022 - mkgmap-dev - The mkgmap lists

Fix and augment sort definitions
by Gerd Petermann 12 Oct '23

12 Oct '23

Hi Ticker, see https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3948 https://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3949 the sortResource.patch reverts these changes. In Mapsource the results are a bit better with your patch. I'll try again with my Oregon later. Gerd

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some findings about NT format
by Gerd Petermann 15 Apr '22

15 Apr '22

Hi all, my findings so far which are not used / needed in GPXSee. Maybe it helps someone else: - method linkLabel() could extract further road labels, bit 0x800000 flags the last of up to 4 labels. - method linkLabel() extracts a flag, the bit 0x08 in this flag seems to signal a tunnel. No idea yet what the other bits mean. - the flags field in struct LinkInfo is used like this (netfile.cpp) bool firstIsShape = (linkInfo.flags >> 10) & 1; bool singleTopology = (linkInfo.flags >> 9) & 1; bool hasLevels = (linkInfo.flags >> 11) & 1; My guesses about the meaning of the lower bits: // int road_speed = linkInfo.flags & 7; // bool oneway = (linkInfo.flags >> 3) & 1; // int road_class = (linkInfo.flags >> 4) & 7; - The NET header can have two more sections, e.g. I see 00000684 | f6 cb 13 00 | NET5 ???, offset 13cbf6 00000688 | 96 0a 01 00 | NET5 ???, length 68246 0000068c | 23 00 | ??? 0000068e | 8c d6 14 00 | NET6 ???, offset 14d68c 00000692 | 28 05 00 00 | NET6 ???, length 1320 00000696 | 03 00 | NET6 ??? record size 3 00000698 | 02 00 00 00 | ??? NET6 contains a list of offsets into NET4, they are in sorted order and each offset points to the byte following the flag byte that is read in linkLabel() I see 440 recrods here, and 441 NOD6 records in the corresponding NOD file, so they are obviously related (field blockIndexId). I've not yet found where the address info like city name, zip name, and house numbers are stored. Maybe that's in NET5. I think in the old non-NT format there is no need to know NOD data to be able to read NET, so I woulld expect that this is also possible with NT maps. Gerd

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Commit r4899: Polish input: Only create roads for line types which are considered special routable types,
by svn commit 08 Apr '22

08 Apr '22

Version mkgmap-r4899 was committed by gerd on Fri, 08 Apr 2022 Polish input: Only create roads for line types which are considered special routable types, not all types 0x01..03f http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4899

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Commit r4898: prevent NullPointerException for roads which are not added to NOD
by svn commit 08 Apr '22

08 Apr '22

Version mkgmap-r4898 was committed by gerd on Fri, 08 Apr 2022 prevent NullPointerException for roads which are not added to NOD http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4898

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"Too many roads"
by John Thorn 08 Apr '22

08 Apr '22

I am working on a map of France based on Open IGN, OSM and other sources. I have broken it into tiles 0.25 latitude by 0.5 longitude. I built a set of contours using 'marching squares' on the IGN Height data.. But MKGMAP fails on some of the contour tiles saying 'Too many roads' (which I guess is really Too many Polylines). Is this a limit on the number of Polylines (I could join some shorter ones together) or a limit on the number of data points? Thanks, John www.the-thorns.org.uk/46251550.mp

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mkgmap:area2poi placement
by lig fietser 06 Apr '22

06 Apr '22

Hi, I've noticed on my map that mkgmap places the poi of an area like the "Nationalpark Niedersächsisches Wattenmeer" (https://www.openstreetmap.org/relation/157811) outside of the National Park, so not in the sea but on the mainland near Wittmund. I prefer to place those pois inside such odd shapes polygons. OSM carto puts the label just east of Borkum. I'm not sure if there was a mkgmap option how to control this behaviour? I know it can be done by manipulating the OSM data and add a label, but I prefer to control this in mkgmap.

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