[mapserver-users] minscaledenom puzzle, Mapserver 6.0.1

[Peter N. Schweitzer]

Surely I have misunderstood minscaledenom or otherwise have misused it.

I just switched over to Mapserver 6.0.1 (Linux, CentOS, data in
PostgreSQL+PostGIS)

The web page is http://mrdata.usgs.gov/mineral-resources/mrds-us.html
Feature type is point.  The classes from the map file are these:

  labelitem "site_name"
  labelmaxscaledenom 250000
  classitem "dev_stat"
  class
    maxscaledenom 7000000
    expression ('[dev_stat]' == 'Producer' or '[dev_stat]' == 'Past Producer')
    name "Mine, past or present producer"
    color 160 0 0
    symbol "mine"
    size 5
    label
      color 0 0 0
      size 10
      type truetype
      font arial
      position cr
      offset 4 4
      end
    end
  class
    maxscaledenom 7000000
    expression ('[dev_stat]' == 'Prospect' or '[dev_stat]' == 'Occurrence')
    name "Prospect or occurrence"
    color 0 160 0
    symbol "opensquare"
    size 5
    end
  class
    maxscaledenom 7000000
    expression ('[dev_stat]' == 'Plant')
    name "Processing plant"
    color 0 0 160
    symbol "mine"
    size 6
    label
      color 0 0 0
      size 10
      type truetype
      font arial
      position cr
      offset 4 4
      end
    end
  class
    maxscaledenom 7000000
    expression ('[dev_stat]' == 'Unknown')
    name "Unknown"
    color 0 0 0
    symbol "occurrence"
    size 6
    end
  class
    minscaledenom 7000000
    color 160 0 0
    symbol 0
    end

Under mapserver 5.6.7, this generated red pixels for every point when
the map is zoomed out; those are replaced by the square symbols when
the map is zoomed in.

But under 6.0.1, I am not getting the 1-pixel symbols when zoomed out.
I assumed that the last class defined above would apply when the scale
is coarser than 1:7M.

Here is the OpenLayers command that loads this layer:

  var wms = new OpenLayers.Layer.WMS(
    "Mineral Resources",
    "http://mrdata.usgs.gov/cgi-bin/mapserv?";,
    {
      map: 'mrds.map',
      transparent: 'true',
      layers: 'mrds'
      },
    {
      singleTile: 'true',
      ratio: 1
      }
    );

Would some modification of my map file or my OpenLayers javascript
bring back my little red pixels?

Thanks for any help you might offer.

Peter
--
Peter N. Schweitzer (MS 954, U.S. Geological Survey, Reston, VA 20192)
(703) 648-6533  FAX: (703) 648-6252  email: pschweit...@usgs.gov
<http://geology.usgs.gov/peter/>
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