[mkgmap-dev] Tile Border Artifact with --generate-sea

Sat Feb 26 11:13:34 GMT 2011

WanMil,

Many thanks.

I have a little further information:

If I examine the screen on my GPS with a magnifying glass near to the 
'thin blue line' artefact, where a road crosses this line there is an 
artefact crossing the road line also. However this is NOT directly in 
line with the 'blue' line and is orthogonal to the road. By this I mean 
that the artefact across the road is perpendicular to the road direction 
and therefore not parallel to the 'blue line along the tile boundary.

I hope this is clear and we can find a solution to this.

Bill.

WanMil wrote:
>>> I have just noticed 'thin blue line' (I estimate about 1 pixel wide)
>>> along every tile edge )or border).  This is more obvious when I 'zoom
>>> out' and it highlights my tiles because there is this blue sea-coloured
>>> border around them.
>>>
>>> I am using the Geofabrik GB OSM download and my relevant compile line is:
>>> --generate-sea:no-mp, extend-sea-sectors, close-gaps=10000.
>>>
>>> Currently using mkgmap version 1827
>>>
>>> Has this been seen before and Is there a setting for me to avoid this?.
>>>
>>>       
>> Just a bit more information:
>>
>> Strangely, I can see the blue lines at the tile borders on my
>>   Garmin GPSMAP 62s but NOT on the Etrex Legend HcX of my Wife.  This is
>> using the exact same TYP file.
>>
>> On examining the screen with magnifier it seems that the lines are 2 pixels
>>   wide
>> so I guess this is a one-pixel 'sea' border added to each tile boundary.
>>
>> Any ideas?.
>>
>>     
>
> Bill,
>
> I have an idea. The sea bounds are made one or two long/lats larger than 
> the tile borders. Maybe that's the cause for it.
> I will investigate it and post about my results.
>
> WanMil
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>
>   
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