[Tilecache] Error generating tile at highest resolutions

[Ritesh Ambastha]

The problem is with your coordinates - maxExtent: -20037497.21,
-20037497.21,20037497.21, 20037497.21

For the higher zoom level, these coordinates are too far from the
tile-corner (left-bottom). It works peacefully for the lower zoom levels.
But, it will not work for the higher ones as it will have to tile numerous
blank tiles.

I would recommend you to check the bbox and specify more accurate
coordinates for tiling.

Regards,
Ritesh Ambastha



On Thu, Oct 6, 2011 at 5:56 PM, DFE <mimmopasticcio at gmail.com> wrote:

> Hello All,
> I'm getting the following error when I'm requesting tile only at
> highest resolutions, instead it works correctly for the lowest zoom
> levels.
>
> An error occurred: Current x value 1493284.913512 is too far from tile
> corner x 1493272.954920
>  File "/var/www/tlc/TileCache/Service.py", line 256, in modPythonHandler
>    host )
>  File "/var/www/tlc/TileCache/Service.py", line 181, in dispatchRequest
>    tile = WMS(self).parse(params, path_info, host)
>  File "/var/www/tlc/TileCache/Services/WMS.py", line 19, in parse
>    return self.getMap(param)
>  File "/var/www/tlc/TileCache/Services/WMS.py", line 27, in getMap
>    tile  = self.getLayer(name).getTile(bbox)
>  File "/var/www/tlc/TileCache/Layer.py", line 312, in getTile
>    coord = self.getCell(bbox)
>  File "/var/www/tlc/TileCache/Layer.py", line 287, in getCell
>    raise TileCacheException("Current x value %f is too far from tile
> corner x %f" % (minx, tilex))
>
>
>
> I'm using OpenLayers 2.11:
>
>  map = new OpenLayers.Map('map', { maxExtent: new
> OpenLayers.Bounds(-20037497.21, -20037497.21,20037497.21,
> 20037497.21),
>                 projection: new OpenLayers.Projection("EPSG:3857"),
>
>  resolutions:[156543.0339,78271.51695,39135.758475,4891.969809375,2445.9849046875,1222.99245234375,611.496226171875,305.7481130859375,152.87405654296876,76.43702827148438,38.21851413574219,19.109257067871095,9.554628533935547,4.777314266967774],
>                units: "m"});
> var tlc_land = new OpenLayers.Layer.WMS("TileCacheMerc land",
>                 "http://"+window.location.host+"/tlc/tilecache.py",
>                 {format: 'image/png', layers:'land_merc'}
>                );
>                map.addLayer(tlc_land);
>
> and I'm usign TileCache 2.11 under FastCGI module of httpd:
>
> [land_merc]
> type=WMS
> url=http://localhost/cgi-bin/mapserv?map=/var/www/maps/main.map
> layers=land_merc
> extent_type=loose
> # spherical_mercator=true
>
> resolution=156543.0339,78271.51695,39135.758475,4891.969809375,2445.9849046875,1222.99245234375,611.496226171875,305.7481130859375,152.87405654296876,76.43702827148438,38.21851413574219,19.109257067871095,9.554628533935547,4.777314266967774
> bbox=-20037497.21, -20037497.21,20037497.21, 20037497.21
> srs=EPSG:3857
> tms_type=google
>
> Of course the direct WMS calls to mapserver is working correctly.
>
> Do you have any suggestion?
> Thanks in advance.
>
> domenico febbo.
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>
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