Tile Border Artifact with --generate-sea
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?.
Bill Lancashire <bill.lancashire <at> o2.co.uk> writes:
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?.
flabot <at> googlemail.com <flabot <at> googlemail.com> writes:
I do not understand your brief reply. This is where I download the OSM files for Great Britain: http://download.geofabrik.de/osm/europe/ Are you suggesting this source may be the problem for me?
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
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 _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
participants (3)
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Bill Lancashire -
flabot＠googlemail.com -
WanMil