[MapProxy] empty image on small scales

[dirk.thalheim at bkg.bund.de]

Dear list,

I'm using MapProxy to serve a WMS from a WMTS source. So far it works great.

Unfortunately when I zoom out at a scale of around 1:75.000.000 it stops displaying the map and an empty image is returned. Looking into the source request logging it shows that no request at all is triggered in that case. Do you have any ideas why this happens and how to avoid this? I want to display the map over all scales.

Here is my layer, cache and source configuration:

layers:
  - name: 'test'
    title: Test
    sources: [cache_test]

caches:
  cache_test:
    grids: [default028mm]
    sources: [wmts_test]
    disable_storage: true

sources:
  wmts_test:
    type: tile
    url: http://server/service/wmts/tile/%(z)s/%(y)s/%(x)s
    grid: default028mm
    transparent: true
    coverage:
      bbox: [-35.99999055523457, 18.404252334645022, 53.999993942633786, 79.32196275583068]
      bbox_srs: EPSG:4326

grids:
  default028mm:
    srs: 'EPSG:25832'
    tile_size: [256, 256]
    res: [4891.96981025128,
          2445.98490512564,
          1222.99245256282,
          611.49622628141,
          305.748113140705,
          152.874056570353,
          76.4370282851763,
          38.2185141425881,
          19.1092570712941,
          9.55462853564703,
          4.77731426782352,
          2.38865713391176,
          1.19432856695588,
          0.597164283477939,
          0.29858214173897]
    bbox: [-3803165.98427299, 2544186.7257000003, 3710899.6443000007, 8805908.08284866]
    bbox_srs: 'EPSG:25832'
    origin: 'ul'

Kind regards,

Dirk


Dirk Thalheim
_____________________________________
Department GI 5
Federal Agency for Cartography and Geodesy (BKG)

Karl-Rothe-Str. 10 - 14, 04105 Leipzig
phone: +49 (0)341 5634 311
personal email: dirk.thalheim at bkg.bund.de<mailto:dirk.thalheim at bkg.bund.de>
department email: GI5 at bkg.bund.de<mailto:GI5 at bkg.bund.de>
internet: http://www.bkg.bund.de<http://www.bkg.bund.de/>


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