[mapserver-users] Any thoughts on combining 3 regional maps into one?

[Stephen Woodbridge]

On 10/2/2013 12:30 PM, Pericles Nacionales wrote:
> My apologies, I didn't read your message close enough the first time...
>
> I guess regardless of how you do it, you'll have to create a new
> mapfile. Another thought is to define each layer in a separate mapfile
> and then using "include" to add each of them to a skeleton mapfile. I
> don't know how much that impacts rendering speed but I know Steve Lime
> uses that technique and it seems to work well for him.

Thanks Perry,

The whole problem gets messy very fast because of extensive use of 
TILEINDEX and these are all relative to the SHAPEPATH so they will have 
to get rebuild also. So it looks like the options are:

1. create a trivial mapfile the proxies wms requests to the regional files

2. create a new mapfile combining everything and probably recreating all 
the tileindex files.

I also thought about using cpp or a script to mangle template mapfiles, 
but changes in the TILEINDEX location makes this non-trivial.

I think I'll try 1. first. It should be ok and is a lot less work, but 
it does not seem to be efficient way to do this.

-Steve

> Hope that helps.
>
> -Perry
>
> On Oct 2, 2013 11:13 AM, "Pericles Nacionales" <naci0002 at umn.edu
> <mailto:naci0002 at umn.edu>> wrote:
>
>     Steve,
>
>     Have you thought about layer groups? Define a group for each
>     Canadian, US, and Mexican data layers you want to combine...
>
>     -Perry
>
>     On Oct 2, 2013 10:54 AM, "Stephen Woodbridge"
>     <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
>
>         Hi all,
>
>         I have 3 regional mapfiles for US, Canada and Mexico and I want
>         to create a single North America map. Since the data comes from
>         separate vendors and they refresh on different cycles, I'm
>         trying to figure out the best way to structure this in a
>         mapfile. I also need to maintain each region as a separate
>         mapfile. (I'm ignoring issues like data alignment over borders.)
>
>         The reginal mapfile data is structure like:
>
>         .../us/data/<shapefiles>
>         .../us/us.map
>         .../mx/data/<shapefiles>
>         .../mx/mx.map
>         .../ca/data/<shapefiles>
>         .../ca/ca.map
>
>         The shapepath for each mapfile is set to the local data
>         directory. What I would like to avoid is having to change all
>         the paths in the mapfiles to accomodate a change like:
>
>         .../na/us/data/
>         .../na/mx/data/
>         .../na/ca/data/
>         .../na/na.map
>
>         It would be cool if I can change the shapepath in the middle of
>         the mapfile so layers beyond the change would use the new
>         shapepath, but I suspect that will not work.
>
>         So it looks like my options are:
>
>         1. rewrite all the mapfile data pathes as I combine them into
>         one new mapfile and maintain two copies, regional and na versions.
>
>         2. maybe create a new mapfile that loads each of the regions as
>         a WMS client and overlays the adjacent regions. This will get
>         served via mapcache so that might add some options for tile
>         assembly.
>
>         3. other ideas????
>
>         Thanks,
>            -Steve
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