On 23.03.2010 21:56, Mark Burton wrote:
> Felix,
>
>
>> Or that the patch was not enacted on resolution 24??
>>
> Yes, that's true and looking at the code, I think that for polygons it
> probably should always be done and, furthermore, should be done after
> the polygon splitting so that any tiny polygons produced by the
> splitting get removed. i.e. it should look like this, perhaps:
>
Well as when that patch was written, the optimum would be adjustable
drop sizes based on resolution. Here would be my optimal settings for
polygons:
24:2
23:4
22:8
21:12-16 (unsure, would need some experimentation)
20:20-30
19:40-80
As for lines, it should never be done on 24 for routbable lines (else
routing gets broken). For other resolutions I have not yet experimented
with it.
> diff --git a/src/uk/me/parabola/mkgmap/build/MapBuilder.java
> b/src/uk/me/parabola/mkgmap/build/MapBuilder.java
> index c2593c6..28098ee 100644
> --- a/src/uk/me/parabola/mkgmap/build/MapBuilder.java
> +++ b/src/uk/me/parabola/mkgmap/build/MapBuilder.java
> @@ -930,13 +930,13 @@ public class MapBuilder implements Configurable {
> if (enableLineCleanFilters&& (res< 24)) {
> filters.addFilter(new
> PreserveHorizontalAndVerticalLinesFilter());
> filters.addFilter(new RoundCoordsFilter());
> - filters.addFilter(new SizeFilter(minPolygonSize));
> //DouglasPeucker behaves at the moment not really
> optimal at low zooms, but acceptable.
> //Is there an similar algorithm for polygons?
> if(reducePointError> 0)
> filters.addFilter(new
> DouglasPeuckerFilter(reducePointError));
> }
> filters.addFilter(new PolygonSplitterFilter());
> + filters.addFilter(new SizeFilter(minPolygonSize));
> filters.addFilter(new RemoveEmpty());
> filters.addFilter(new ShapeAddFilter(div, map));
> _______________________________________________
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>
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