[Tilecache] tilecache and map servers MAX/MIN SCALE DENOM

[Rene Kolb]

Hello everybody,

   i have a problem with tilecache when using MAXSCALEDNOM / MINSCALEDENOM
option in the map file definition.

the map file has a lots of layers, whose records looks like these:

...

 42 LAYER
 43   NAME spoj50_0_0
 44   TYPE RASTER
 45   UNITS meters
 46   STATUS ON
 47    PROJECTION
 48         "init=epsg:4326"
 49    #    "init=epsg:2065"  # krovak s-jtsk
 50    END
 51   MAXSCALEDENOM 10000000
 52   MINSCALEDENOM 200000
 53   DATA '/home/koleje/app/data5/spoj50/spoj50_0_0_0_0.tif'
 54   CLASS
 55     NAME "spoj50_0_0"
 56     STYLE
 57         COLOR 128 244 -1
 58     END
 59     # TEMPLATE
 60   END
 61 END

..
<cut>
...

387 LAYER
388   NAME spoj200_0_0
389   TYPE RASTER
390   UNITS meters
391   STATUS ON
392    PROJECTION
393         "init=epsg:4326"
394    #    "init=epsg:2065"  # krovak s-jtsk
395    END
396   MAXSCALEDENOM 200000
397   MINSCALEDENOM 0
398   DATA '/home/koleje/app/data5/spoj200/spoj200_0_0.tif'
399   CLASS
400     NAME "spoj200_0_0"
401     STYLE
402         COLOR 128 244 -1
403     END
404     # TEMPLATE
405   END
406 END
...



when i use this map file with mapserver via cgi call, everythings works fine
and at some point the mapserver
uses different layers (better quality - spoj200*) to render the map, you can
check a working example here:
http://koleje.hiro.cz/cgi-bin/mapserv?map=/home/koleje/app/koleje-test3.map

then when I use the same map file in working tilecache environment, the map
is not rendering (http://koleje.hiro.cz/test),
i get only light blue tiles, which usually means, i'm out of bounds (?)
if I remove the MAX and MIN SCALEDENOM options from map file definition,
tilecache works fine(!!) ( but of course without scaling) .

did i forgot about something?
i find that i maybe have to add a 'resolutions' option to the tilecache
configuration, but i don't know what values i have to set
(if its true that this option has to be set - maybe i'm completely wrong
with this)

i'd appreciate any useful hint, advice or link to a resource dealing with
such a dilemma.

Thanks a lot in advance
Rene




tilecache.cfg
----------------
[cache]
type=Disk
base=/home/koleje/app/tmp/maps

[basic]
type=WMS
url=
http://msdemo.hiro.cz/cgi-bin/mapserv?map=/home/koleje/app/koleje-test3.map
layers=spoj50_0_0,spoj50_0_1,spoj50_0_2,spoj50_0_3,spoj50_0_4,spoj50_1_0,spoj50_1_1,spoj50_1_2,spoj50_1_3,spoj50_1_4,spoj50_2_0,spoj50_2_1,s
poj50_2_2,spoj50_2_3,spoj50_2_4,spoj200_0_0,spoj200_0_1,spoj200_1_0,spoj200_1_1
extension=png
mapfile=/home/koleje/app/koleje-test3.map
srs=EPSG:4326
maxresolution=214
spherical_mercator=false
bbox=3427592,5503562,3536464,5663116


openlayers cfg from http://koleje.hiro.cz/test:
----------------------------------------------------

      ...
            var epsg4326 = new OpenLayers.Projection("EPSG:4326");

            var bounds = new OpenLayers.Bounds(3427592, 5503562, 3536464,
5663116);

            map = new OpenLayers.Map('map',
                        {
                        maxExtent: bounds,
                        projection: epsg4326,
                        displayProjection: epsg4326,
                        maxResolution: 214,
                        //controls: []
                        });

  ....
                layer = new OpenLayers.Layer.WMS( "Zakladni mapa",
                        ["http://koleje.hiro.cz:3128/tilecache/tilecache.cgi
?",
                        "http://koleje1.hiro.cz:3128/tilecache/tilecache.cgi
?",
                        "http://koleje2.hiro.cz:3128/tilecache/tilecache.cgi
?",
                        "http://koleje3.hiro.cz:3128/tilecache/tilecache.cgi
?",
                        "http://koleje4.hiro.cz:3128/tilecache/tilecache.cgi
?"],
                 {
                        layers: 'basic',

                        map: "/home/koleje/app/koleje-test3.map",
                        transitionEffect: 'resize',
                        transparent: "false", format: "image/png",
                 },
                 {isBaseLayer: true,  reproject: false, }
                );

               map.addLayer(layer);
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