[mkgmap-dev] PATCH v1: highwayCount

Sun Feb 10 19:51:04 GMT 2013

Hi Steve,

the test doesn't show any difference, so I think it will not detect the
problem that I see.
I try to describe it more detailed:
- I've added a call to GpxCreator.createGpx for each line that is part of a
road
- I've made sure that all gpx files were written with unique names so that I
don't
overwrite something. Here's the patch I've used:

order.patch <http://gis.19327.n5.nabble.com/file/n5748813/order.patch>  

I've executed the modifed version once with --transparent, renamed the gpx
dir , again without
Then I've compared the resulting gpx files and found a few ones that had
different
contents. These showed that the order of the line segments changed.
The reason is that we first divide the roads into segements, then distribute
the segments
to different sub divisions and finally process the subdivisions without
looking 
at the order of the line segments.

So, if this matters, the result of the test should show whether or not the
segments 
of a road are saved in order or not.

Attached is also a zip archive showing the different results for a special
way.
gpx.zip <http://gis.19327.n5.nabble.com/file/n5748813/gpx.zip>  

Gerd

GerdP wrote
> Hi Steve,
> Steve Ratcliffe wrote
>> Hi Gerd
>> 
>>> I found differences for roads which are divided into multiple parts .
>>> The polyline parts "arrive" in different order in the
>>> RoadDef.addPolylineRef
>>> method.
>> 
>> OK so I wrote code to check this. However...
>> 
>> 1. In a complete map of the UK I did not see a single example of there 
>> being more than one line in the same RoadDef (at the same level).
>> 
>> 2. Lines joining within the same RoadDef is not strictly required as 
>> there are many unconnected lines in non-mkgmap maps.
>> 
>> I do see the breakage with --transparent in a UK map, so it looks as if 
>> there is another reason for it.
> thanks, I will try.
> I saw these effects in the austria map.
> The effect of the --transparent option is only a change in the number of 
> shapes. This means also a change in the number of sub divisions and
> how different parts of a road are distributed to these sub divisions.
> So, --transparent doesn't directly cause a problem.
> 
> Gerd

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