[mkgmap-dev] Empty rectangles in map

Sun Apr 25 13:50:51 BST 2021

Hi Gerd

More more testing with standard style / options etc. As well as --order
-by, I had some level params that confused.

With GPSMapEdit at Zoom level 2, there is a wide cut from the LHS
forest triangle to the holes around 54.9953,-58.2209. It seems to be
the total height of the holes.

Similar shows in MapSource, but it much more difficult to find.
Resolution needs to be <= 7mi before forest kicks-in. I didn't
investigate how far left the blank area went.

Looking more closely on Basecamp, the blank area is a rectangle approx
54.975,-58.302 to 55.0178,-58.6247, ie it doesn't go to the edge of the
forest triangle. Also it only shows when detail-level is set to
"highest"

Ticker

On Sun, 2021-04-25 at 11:03 +0100, Ticker Berkin wrote:
> Hi Gerd
> 
> Just tried this with latest trunk and my standard environment (mainly
>  --order-by-decreasing-area
> and get very inconsistent results.
> 
> On GPSMapEdit seems reasonable - shows forest triangle and, within, a
> small area with a number of holes.
> 
> MapSource shows a white square, no forest colour and I can't move the
> map around, also it doesn't seem to zoom out enough. First time I
> looked I saw 2 white squares.
> 
> Basecamp shows the forest triangle, but I can't find the
> islands/holes
> 
> I've had problems before with MapSource or Basecamp caches, so I'll
> delete these. Also try with simple options etc
> 
> Ticker
> 
> 
> On Sun, 2021-04-25 at 07:31 +0000, Gerd Petermann wrote:
> > Hi Experts,
> > 
> > while working on the faster-mp branch I experimented with the
> > monster
> > relation r9488835. I added tag landuse=forest to it so that it is
> > actually rendered and found huge (wrong) empty rectangles in the
> > forest.
> > The original file is very complex but the same problem also occurs
> > with a simplified file, see 
> > http://files.mkgmap.org.uk/download/505/bad-map-split.osm.pbf
> > Just use e.g.
> > java -jar mkgmap.jar --gmapi bad-map-split.osm.pbf 
> > Problem: Basecamp and Mapsource don't show this map, GpsMapEdit
> > shows
> > a large white rectangle near 54.97743 -58.30292
> > 
> > I assume that we hit some unknown limit , possibly in LinePreparer
> > or
> > MapSplitter. 
> > I've also tried some older versions, so far they all show the
> > problem.
> > Any idea where to look? 
> > 
> > RgnDisplay shows this data for the problemat area:
> > --------- Level 0, Subdiv 279 -------------------------------------
> > --
> > -----------
> >          |        |                         | final at 265f, (end
> > 25e2)
> >          |        |                         | polygon start 2634 to
> > 265f
> > 00002634 | 000000 | 4b                      | Polygon 1
> >          |        |                         | Type 0x4b
> > 00002635 | 000001 | 00 00 00                | Label offset:
> > 0x000000
> > ()
> > 00002638 | 000004 | d0 3b                   | Long delta 15312
> > 0000263a | 000006 | 2a 3a                   | Lat delta 14890
> >          |        |                         | Start point 55.24913,
> > -61.91139 2574796/-2885280
> > 0000263c | 000008 | 0c                      | Bitstream length 12
> > 0000263d | 000009 | bb                      | Base bb
> > 0000263e | 00000a | 06 43 04 00 00 00 4c d1 | Bitstream (len: 12,
> > 0xc)
> > 00002646 | 000012 | 41 ef 00 00             | 
> >          |        |                         | xsame false, xneg
> > false
> >          |        |                         | ysame true, yneg true
> >          |        |                         | xbase 16, ybase 15
> >          |        |                         | Coord 55.24913,
> > -62.56851 2574796/-2915904 [-30624,+0]
> >          |        |                         | Coord 54.61014,
> > -62.56851 2545017/-2915904 [+0,-29779]
> >          |        |                         | Coord 54.61014,
> > -61.91139 2545017/-2885280 [+30624,+0]
> >          |        |                         | 0 bits left, 0
> >          |        |                         |  
> > 0000264a | 000016 | 50                      | Polygon 2
> >          |        |                         | Type 0x50
> > 0000264b | 000017 | 00 00 00                | Label offset:
> > 0x000000
> > ()
> > 0000264e | 00001a | d0 3b                   | Long delta 15312
> > 00002650 | 00001c | b4 08                   | Lat delta 2228
> >          |        |                         | Start point 54.97743,
> > -61.91139 2562134/-2885280
> > 00002652 | 00001e | 0b                      | Bitstream length 11
> > 00002653 | 00001f | 9b                      | Base 9b
> > 00002654 | 000020 | f2 8d 04 40 a7 fe d0 4b | Bitstream (len: 11,
> > 0xb)
> > 0000265c | 000028 | e7 00 00                | 
> >          |        |                         | xsame false, xneg
> > false
> >          |        |                         | ysame true, yneg
> > false
> >          |        |                         | xbase 16, ybase 11
> >          |        |                         | Coord 54.97743,
> > -62.51706 2562134/-2913506 [-28226,+0]
> >          |        |                         | Coord 55.01732,
> > -62.54665 2563993/-2914885 [-1379,+1859]
> >          |        |                         | Coord 55.01732,
> > -61.91139 2563993/-2885280 [+29605,+0]
> >          |        |                         | 4 bits left, 0
> >          |        |                         |  
> > 
> > 
> > Gerd
> > _______________________________________________
> > mkgmap-dev mailing list
> > mkgmap-dev at lists.mkgmap.org.uk
> > https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev