[mkgmap-dev] Empty rectangles in map

Sun Apr 25 11:03:14 BST 2021

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
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