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

Sat Feb 26 10:48:59 GMT 2011

>
>>
>> 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