[Tilesathome] Lowzoom rendering

[Jeremy Adams]

I've rendered and uploaded two tiles 74,96 and 74,97.  They're the southeastern part of Pennsylvania in the US.  These tiles cover Allentown and Philadelphia so they're fairly dense.  I'm not sure that I did everything properly though since the new lowzoom tiles are pretty sparse and as you zoom in from 8 - 11 things get kinda weird.  There are random tiles missing (or blank?) and there's really no solid detail until you get down to z12.

Can someone have a look and tell me if I'm doing something wrong or if this is the expected output?  Maybe I'm not fully understanding the new lowzoom method...

Here's a link to said area:
http://informationfreeway.org/?lat=40.061583532504876&lon=-76.45287343698673&zoom=8&layers=B000F000F

-Jeremy


  ----- Original Message ----- 
  From: 80n 
  To: Jeremy Adams 
  Cc: tilesathome at openstreetmap.org 
  Sent: Monday, February 25, 2008 3:40 PM
  Subject: Re: [Tilesathome] Lowzoom rendering


  Jeremy
  Yes, you are doing the right thing.

  There's an unresolved problem with the upload script, in that it only tries to upload the currently configured layer.  

  The workaround is to change the Layers property in layers.conf to each layer in turn and then run upload.

  Also below I assume you've made a typo, it should be:
  lowzoom_composite.pl 74 95 8 12 tile captionless caption
  not
  lowzoom_composite.pl 74 95 8 12 captionless caption

  hth
  80n


  On Mon, Feb 25, 2008 at 7:11 PM, Jeremy Adams <milenko at king-nerd.com> wrote:

    Just to make sure I'm doing this correctly:

    If I want to render a lowzoom tile (say 74,95) I first render a lowzoom caption-only using the layers.conf you provided below.  I would run perl tilesGen.pl xy 74 95 8.  Then upload and wait for processing.

    After the t at h server has processed the tile I then run perl lowzoom_composite.pl 74 95 8 12 captionless caption.  After it does it's thing, I have the tiles and they appear to be rendered OK.  I'm not sure how to get them uploaded though.  I dumped them in the temp dir and tried using tilesGen.pl to upload them, but it only grabbed the caption tiles and left the captionless behind.  Is there a different method for uploading these?

    -Jeremy

      ----- Original Message ----- 
      From: 80n 
      To: Jocelyn Jaubert 
      Cc: tilesathome at openstreetmap.org 
      Sent: Saturday, February 23, 2008 6:35 AM
      Subject: Re: [Tilesathome] Lowzoom rendering


      The new lowzoom method uses a different process.  

      The first step is to generate a lowzoom caption-only layer for z8-z11.  There's no layers.conf in svn that will do this at the moment, but the one I use is included below.

      You then have to upload this layer and wait until it has be processed by the t at h server.  Currently the next step expects to be able to download the caption layer, and you don't get up-to-date results unless its there.

      The second step is to run the tools/lowzoom/lowzoom_composite.pl script using the following arguments:

      lowzoom_composite.pl x y 8 12 tile captionless caption

      This will read the z12 captionless base layer and the caption layer from z8 to z11 and composite these together to create the tile layer which is what ultimately gets uploaded.

      This approach currently works best for z8 - z11, there is a projection bug which causes captions to be misplaced at levels lower than z8, so usual tilestitching method is still the best approach for z0 - z7.

      There's a summary of the approach here: http://wiki.openstreetmap.org/index.php/Tiles%40home#How_the_client_works

      80n

      My layers.conf for z8-z11:

      # Layer configuration for tiles at home
      # ==================================
      #
      Layers=lowzoom
      LayersCapability=lowzoom


      Layer.lowzoom.MaxZoom=11
      Layer.lowzoom.Rules.8=osmarender/caption-z8.xml
      Layer.lowzoom.Rules.9=osmarender/caption-z9.xml
      Layer.lowzoom.Rules.10=osmarender/caption-z10.xml
      Layer.lowzoom.Rules.11=osmarender/caption-z11.xml

      Layer.lowzoom.Prefix=caption
      Layer.lowzoom.Preprocessor=
      Layer.lowzoom.RenderFullTileset=1

      Layer.lowzoom.Transparent=1




      On Sat, Feb 23, 2008 at 10:40 AM, Jocelyn Jaubert <jocelyn.jaubert at gmail.com> wrote:

        Hi,

        I'm doing some lowzoom rendering by running:
        ./tilesGen.pl xy 133 93 8

        But the tile I generate are completely different than the other ones.
        In fact, it seems that I don't have the code to simplify the amount of
        printed town names.

        My client is up to date (revision 6954).

        Did I forgot something ?

        Thanks,
        Jocelyn

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