[Tilecache] TileCache shows pink tiles after a certain zoom level

martin g myint101 at gmail.com
Wed May 13 10:28:17 EDT 2009


Dear Userlist,

I'm running TileCache with Openlayers and Mapserver (under CGI) - my
Openlayers .php file is working fine until the fourth zoom level - only some
parts of the map are shown and on the corners and borders the images aren't
drawn - only my Overview map (with the same values like the map has) is able
to show this content -  I guess this is due to wrong resolutions but I don't
know where my mistake is - it would be nice if someone could help me finding
the error.


Here are my map options defined in the Openlayers .php file :
--------------------------------------------------------------------------------------------------------------

                var mapOptions = {    projection: "EPSG:4326",
                                    controls: [],
                                    scales: [17500000, 14000000, 7000000,
3000000, 2000000, 1000000, 400000, 250000],
                                    maxResolution: "auto",
                                    maxExtent: new
OpenLayers.Bounds(60.00167, 20, 100, 44.984),
                                    restrictedExtent: new
OpenLayers.Bounds(60.00167, 20, 100, 44.984),
                                    eventListeners: {"moveend": mapEvent }
                                    };

---------------------------------------------------------------------------------------------------------------

And this is my TileCache layer defined in tilecache.cfg file:
--------------------------------------------------------------------------------------------------------------
[myproject]
type=WMS
url=
http://geo.ac.at/cgi-bin/mapserv5?map=/srv/www/htdocs/project/myproject/mod_mapViewer/myParams/myMap.map
layers=basic, postgis
bbox= 60.00167, 20, 100, 44.984
resolutions= 0.156243, 2406.250000, 420,
0.05555867954073659,0.04444694363258927,0.022223471816294634,0.009524345064126272,0.006349563376084183,0.0031747816880420914,0.0012699126752168362,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0007936954220105229,0.0555586795,0.0444469436,0.0222234718,0.00952434506,0.00634956338,0.00317478169,0.00126991268,0.000793695422
srs=EPSG:4326
extension=png
-----------------------------------------------------------------------------------------------------------

The first 3 resolution values were - I guess -  recommanded by TileCache -
the remaining resolution values are calculated with the following function:

    for (var i = 0; i <= map.numZoomLevels; i++) {
          resolutions.push(map.getResolutionForZoom(i));
    }
    console.log(resolutions.join(','));

Thanks in advance for help.

Martin
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