Hi Gerd
The shape is a figure-of-8 so shapesSplitter needs to give some error.
If this isn't an original OSM shape, it points to some problem with
earlier processing, probably shape-merging. Although it might render
(could be device dependent), further processing (eg overview merging)
could come to grief.
Ticker
On 07/06/2021 10:24, Gerd Petermann wrote:
Hi Ticker,
okay, no problem, I'll work on the faster-mp branch in the mean time
Maybe I'll merge it first into the low-res-opt branch.
Gerd
________________________________________
Von: mkgmap-dev <mkgmap-dev-boun...@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin
<rwb-mkg...@jagit.co.uk>
Gesendet: Montag, 7. Juni 2021 11:23
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] low-res-opt branch: error message from ShapeSplitter
for self-intersecting multipolygon
Hi Gerd
The shape I'm getting in my build has a major problem with a twist
between the 2 parts. I'm having trouble reconciling it with the OSM
map. I've attached the original shape trace.
I agree that some of the messages do need tweaking, but, in this cases
there is a significant problem.
I'll consider the types of messages etc in the new version I'm working
on.
I'm away for a few days and won't be able to do much remotely.
Ticker
On Mon, 2021-06-07 at 07:22 +0000, Gerd Petermann wrote:
Hi Ticker,
please check https://files.mkgmap.org.uk/download/512/63240024.o5m
with (unpatched) r4756 and these options --generate
-sea=multipolygon,floodblocker --preserve-element-order --order-by
-decreasing-area
--allow-reverse-merge
Produces an error message
SCHWERWIEGEND (ShapeSplitter):
e:\osm_out_work\norway\20210511_095323\63240024.o5m: Vertical split
36691968 failed on shape at
http://www.openstreetmap.org/?mlat=65.979056&mlon=12.308790&zoom=17 P
ossibly a self-intersecting polygon
for this invalid multipolygon :
https://www.openstreetmap.org/relation/5294624
The result doesn't look wrong, so I think there should either be no
error message or we need code to remove those self-intersections or
ignore invalid MP like that?
Gerd
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