[Mapserver-dev] Re: time support

Brent Fraser bfraser at geoanalytic.com
Wed Jan 14 13:44:04 EST 2004


  Here's an idea from left field.  The basic problem is we're on the road to
creating a layer-within-a-layer, adding new keywords and possibly changing
the syntax of existing keywords.

How about pointing to another layer (a tileindex layer) from the layer of

  NAME 'landsat images'
  TYPE raster
  TILEITEM "Location"
  TILELAYER "landsat_tiles"  # new keyword; points to tile layer

  NAME 'landsat tile outlines'
  TYPE polygon                     # or have a new type of  "tile" ?
  STATUS off
  DATA "index/landsat.shp"

That way we could leverage existing filtering, connection, etc structure for
the tile layer.  Might be too weird though....


----- Original Message -----
From: "Steve Lime" <steve.lime at dnr.state.mn.us>
To: <morissette at dmsolutions.ca>
Cc: <mapserver-dev at lists.gis.umn.edu>
Sent: Wednesday, January 14, 2004 10:16 AM
Subject: Re: [Mapserver-dev] Re: time support

> I could create a single new keyword (e.g. TILES) and use the older
> keywords to
> populate members of the new object. That's how styles work so that
> older map
> files don't break. In effect:
> would be the same as
>   DATA 'foo'
> To take advantage of filtering you'd have to move to the TILES object.
> The only
> side effect would be that mapscript would break since
> $layer->{tileindex} isn't
> real anymore. That was the same case with styles.
> This seems a reasonable compromise to me anyway.
> Steve
> >>> Daniel Morissette <morissette at dmsolutions.ca> 1/14/2004 7:55:30 AM
> >>>
> Steve Lime wrote:
> > Any comments out there? I kinda need to move swiftly...
> >
> >
> I am concerned by the fact that the new tileindex object would break
> existing mapfiles.  Could we stick to shapefile tileindexes for this
> release for now, since we don't have much time anyway, and perhaps in a
> later release we could move a tileindex object and support tile indexes
> in any format?
> I suppose the main drawback of this approach would be that we would
> have
> to create TILEFILTER/TILEFILTERITEM which would have to be deprecated
> later when we create the tileindex object.
> I dunno.... I think we should try to avoid breaking older mapfiles
> unless we really have to... that's always a pain for users to upgrade
> when we break the mapfile format.
> Daniel
> --
> ------------------------------------------------------------
>   Daniel Morissette               morissette at dmsolutions.ca
>   DM Solutions Group              http://www.dmsolutions.ca/
> ------------------------------------------------------------
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