OpenStreetMap

Test lowzoom for Ireland and Isle of Man

Posted by AndrewMcCarthy on 6 April 2008 in English (English)

Hi folks,

I've done a trial run of building lowzoom (levels 8 to 11) tiles for Ireland and, consequently, the Isle of Man. It seems to have worked fine except for the coastline at the very North, near Derry, and the South, between Cork and Waterford. Has anyone else had a problem like this? It seems to mainly occur at zoom level 8, and only to a very small degree at higher zoom levels:
http://tah.openstreetmap.org/Browse/?x=122&y=80&z=8&layer=tile

(And this is my first diary post :)

Andrew

Comment from daveemtb on 7 April 2008 at 08:47

Curious indeed - the coastline error checker seems happy with the area: http://tile.openstreetmap.nl/coastlines.html?zoom=9&lat=55.02989&lon=-7.16446&layers=B00T

One other issue - the background is grey instead of white... do you know why this is?

Hide this comment

Comment from AndrewMcCarthy on 7 April 2008 at 09:34

Odd. I've looked again, and the background isn't grey, it's transparent. The grey you're seeing is the browser's background. This is specified in the default layers.conf:
Layer.lowzoom.Transparent=1

On the other hand, when I tried to follow the Wiki instructions here:
http://wiki.openstreetmap.org/index.php/Tiles%40home/lowzoom
I managed to run the first stage, but not the second. When I tried, it died, saying that zoom 8 has been included in the tilesGen.pl, so I figured the Wiki may have been out-of-date.

Does anyone know for sure what the actual procedure should be?

Thanks!

Hide this comment

Comment from AndrewMcCarthy on 8 April 2008 at 11:18

Okay, I have the second stage running fine now. I suspect I was running the wrong lowzoom script. It'll take an hour or so to run, and then probably another hour to get through the queue, but it'll be worth it ;)

I see some tiles have rather ugly-looking blank squares in them, which are due to missing data in the database. These are, it seems, automatically added to the low-priority queue for regenerating, so that later they'll be there. Unfortunately, later might be a few weeks!

Hide this comment

Leave a comment

Parsed with Markdown

  • Headings

    # Heading
    ## Subheading

  • Unordered list

    * First item
    * Second item

  • Ordered list

    1. First item
    2. Second item

  • Link

    [Text](URL)
  • Image

    ![Alt text](URL)

Login to leave a comment