Hi Gerd I've been doing experiments on tiles with much more sea and islands (tests before only had a bit of sea and lots of city). With my re-ordering I get a very slightly smaller main tile (4096 bytes in 5614K) and larger osmmap.img (34304 vs. 25088) In both cases I'm getting quite a few shapeSplitter messages where it finds inconsistencies in the line directions across the split-line; normally due to self-intersection. These are happening in both the main tile generation and the overview combining. Once shapeSplitter has generated this type of warning it is indeterminate which is shape and which is hole, so I'd expect gaps in the rendering. I think trunk had eradicated split/self-intersection problems in the tile processing, including the ovm_ file generation. I'm not sure about the overview combiner as, in my standard map-build, I don't merge shapes. Ticker On Fri, 2021-05-21 at 16:41 +0000, Gerd Petermann wrote:
Hi Ticker,
I tried this patch with r4734 and I see no improvements. Maps are larger, more white rectangles in sea.
Maybe my recent changes don't work well with yours? Do you have an example where it improves something with r4734?
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Ticker Berkin <rwb-mkgmap@jagit.co.uk> Gesendet: Freitag, 21. Mai 2021 18:10 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] Problems with sea in overview map
Hi Gerd
I'd been doing some investigation of filters ordering (based on trunk). I'd also done the pre-filtering of lines & shapes by minRes.
My conclusions are:
Shapes: It is better to run SizeFilter after RemoveObsoleteFilter. It is more efficient to run DP filter after both of these.
Lines: LineSplitterFilter should be run after everything that can remove points. It is more efficient to run DP after RemoveObsoleteFilter.
I've adapted my changes into a patch for the low-res-opt branch, along with removal of some resolution tests that are now redundant.
For the contourFilters, I've left DP as the first filter but moved LineSplitter as for the normalFilters
Ticker
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