[mapserver-users] [Mapserver-users] map cache - is it possible to access different was sources based on the current resolution or scale?

[Mark Volz]

Andreas,

Thank you for your reply.  That seems like a good way to conserve disk space.

I have a couple concerns,  First I don't know how to set up seemliness.  Second, I am using windows (ms4w) so I don't know if that would have an impact on how or if I can set up seemliness.  Did you set your seemliness up in the Linux OS, or under the Apache configuration?

Thanks


Mark Volz
GIS Specialist


-----Original Message-----
From: Eichner, Andreas - SID-NLKM [mailto:Andreas.Eichner at sid.sachsen.de] 
Sent: Thursday, June 28, 2012 1:58 AM
To: Mark Volz; MapserverList OSGEO
Subject: AW: [mapserver-users] mapcache - is it possible to access different wms sources based on the current resolution or scale?


Hi Mark,

> The two layers are in the same grid.  I didn't see any documentation 
> on using symlink for zoom levels.  How would I set that up in my 
> configuration file?

you configure mapcache as usual and symlink the levels for the shared zoom levels. MapCache creates a directory structure in the filesystem for every tileset like <base>/<tileset>/<grid>/<zoom_level>.

You can also create it by hand (watch for correct access rights) and then symlink directories from the second tileset to the first. It should look something like this:

# cd <base>/<tileset1>/<grid>/; ls -ld
drwxrwxr-x 3 apache apache 3896 Aug 30  2011 00 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 01 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 02 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 03 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 04 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 05 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 06 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 07 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 08 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 09 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 10 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 11 drwxrwxr-x 2 apache apache 3896 May 14 15:08 blanks

# cd <base>/<tileset2>/<grid>/; ls -ld
drwxrwxr-x 3 apache apache 3896 Aug 30  2011 00 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 01 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 02 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 03 drwxrwxr-x 3 apache apache 3896 Aug 30  2011 04
lrwxrwxrwx 1 root   root     22 Dec  7  2011 05 -> ../../<tileset1>/05
lrwxrwxrwx 1 root   root     22 Dec  7  2011 06 -> ../../<tileset1>/06
lrwxrwxrwx 1 root   root     22 Dec  7  2011 07 -> ../../<tileset1>/07
lrwxrwxrwx 1 root   root     22 Dec  7  2011 08 -> ../../<tileset1>/08
lrwxrwxrwx 1 root   root     22 Dec  7  2011 09 -> ../../<tileset1>/09
lrwxrwxrwx 1 root   root     22 Dec  7  2011 10 -> ../../<tileset1>/10
lrwxrwxrwx 1 root   root     22 Dec  7  2011 11 -> ../../<tileset1>/11
lrwxrwxrwx 1 root   root     22 Dec  7  2011 blanks ->
../../<tileset1>/blanks
drwxrwxr-x 2 apache apache 3896 May 14 15:08 <base>/<tileset1>/<grid>/blanks

This construct shares levels 5-11 between tileset1 and tileset2.