[Mapserver-users] Easy mapfile question

[Martin, Daniel A]

Right, MINSCALE and MAXSCALE control a scale range at which a layer is
presented in the layer.  

I find the easiest way to determine your MINSCALE/MAXSCALE settings is
to place a [scale] tag in your HTML client.  
I even keep an HTML commented scale that I can see by doing "View
Source" in all my map clients:
<!-- scale = 1:[scale] -->
Then, zoom the client to the scale you would like to set as a boundary,
and record the value of that [scale] tag.  You don't even need to
understand the units involved (though that is set by the UNITS item in
your MAP object).

One of my favorite techniques is have two layers by the same name (one
presenting more detail than the other) where the MAXSCALE for one is the
MINSCALE for the other.  As the client crosses this threshold they are
presented with the more detailed layer.  For instance, showing a highway
layer, and then switching to a full street map when zoomed close.

-Dan

> -----Original Message-----
> From: mapserver-users-admin at lists.gis.umn.edu 
> [mailto:mapserver-users-admin at lists.gis.umn.edu] On Behalf Of 
> Jim Buzbee
> Sent: Thursday, January 22, 2004 12:17 PM
> To: mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] Easy mapfile question
> 
> 
> 
> 
> Tyler Mitchell wrote:
> 
> > 
> > 
> > 
> > 
> >>I currently have a single raster image referenced in my map 
> file and 
> >>it is working properly.  My question : How do I add 
> additional rasters 
> >>to the map file?
> > 
> > 
> > The exact same way, just adding more LAYER....END sections.
> 
> OK
> 
> > 
> > 
> >>For example, say I have a raster map of the western US with 
> extents of 
> >>something like 34N, 114W to 35N, 112W. How do I reference 
> this in my 
> >>map file?  Here's my current map file :
> > 
> > 
> > I guess your question may be more related to how to make the images 
> > line up with each other and/or turn automatically.  Are you 
> additional 
> > images georeferenced, i.e. geotiff's or tiffs with world 
> files (.twf)?
> 
> 
> Right now, that's an open question as I haven't acquired the 
> real data.
> 
> For a test, I just created a ".wld" file that described a 
> jpeg file and 
> I'm seeing how it fits in.  From an earlier response, I gather my 
> MINSCALE and MAXSCALE settings for the layers will tell 
> mapserver when 
> to render the raster?
> 
> Jim
> 
> 
> 
> 
> > 
> > 
> >>MAP
> >>   STATUS ON
> >>   EXTENT -180 -90 180 90
> >>   UNITS DD
> >>   SIZE 640 320
> >>   SHAPEPATH  "/usr/apache2/htdocs/maps/"
> >>
> >>WEB
> >>   TEMPLATE world.html
> >>   IMAGEPATH "/usr/apache2/htdocs/tmp/"
> >>   IMAGEURL "/tmp/"
> >>END
> >>
> >>   LAYER
> >>     NAME world
> >>     TYPE RASTER
> >>     DATA world.tif
> >>     STATUS DEFAULT
> >>   END
> >>
> >>END
> >>
> >>Thanks!
> >>
> >>Jim Buzbee
> >>
> >>
> >>_______________________________________________
> >>Mapserver-users mailing list Mapserver-users at lists.gis.umn.edu
> >>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
> > 
> > 
> > 
> 
> _______________________________________________
> Mapserver-users mailing list
> Mapserver-users at lists.gis.umn.edu 
> http://lists.gis.umn.edu/mailman/listinfo/maps> erver-users
>