grouping raster tiles for mapserv WMS

[Bart van den Eijnden]

Hi Jeff,

you can group the layers together using the GROUP keyword. You define
GROUP at the LAYER level.

GROUP [name]

Name of a group that this layer belongs to. The group name can then be
reference as a regular layer name in the template files, allowing to do
things like turning on and off a group of layers at once.

With respect to scale units, I think the units for scale depend on the
UNITS keyword in your MAP object.

UNITS [feet|inches|kilometers|meters|miles|dd]

Best regards,
Bart

On Fri, 18 Feb 2005 13:32:20 -0500, Jeff de La Beaujardiere
<jeff2002 at SUNRISE.GSFC.NASA.GOV> wrote:

> Suppose I have a large TIFF image cut into tiles forming a
> multi-resolution pyramid (each tile is a separate TIFF, not
> a tiled TIFF).  I would like to have mapserv access the
> lowest-resolution tile that covers the area of interest at
> the user-requested size.
>
> I created a single .shp file using gdaltindex referencing
> all of my tiles, in order from lowest to highest resolution,
> but mapserv does not seem to be taking advantage of that
> TILEINDEX (that is, mapserv quickly renders high-res local images
> but is slow to create a global overview).  Have I misunderstood
> how a .shp file is supposed to be created and used?
>
> I would like to have a separate TILEINDEX at each resolution,
> with appropriate MINSSCALE and MAXSCALE, but I don't see how
> to group those in a single WMS LAYER since CLASS can contain
> MINSCALE and MAXSCALE but cannot contain TILEINDEX (i.e., it
> seems only 1 TILEINDEX is permitted for each LAYER).
>
> Confused,
> Jeff DLB
> mapserv newbie
>
> P.S. Also, the expected units of MIN/MAXSCALE do not seem to be
> documented - is it coordinate units per pixel or what? My
> input data are in lon-lat.
>



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