[MapProxy] black areas

[Pestereva, Anna]

Vanessa,

here is a sample of what we use:

......
parts:
  on_error: &onerror
    other:
      response: transparent
      cache: false

sources:
  naip_wms:
    type: wms
    req:
      url:
http://raster.nationalmap.gov/ArcGIS/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer
      layers: 0
    coverage:
      bbox: [-124.82,24.49,-66.93,49.44]
      bbox_srs: 'EPSG:4326'
    transparent: true
    on_error: *onerror
......

Hopefully either "transparent" or "on_error" option will do the trick.
Notice, that "transparent: true" is outside the "req" option, which also
works for tile sources. Although in my case it worked for wms source from
within "req" option just the same as from outside. You can also find the
above WMS source useful for control testing.


Another useful option looks like is transparent_color
<http://mapproxy.org/docs/nightly/sources.html#image>, it removed even more
blackness compared to the above config:

......
sources:
  naip_wms:
    type: wms
    req:
      url:
http://raster.nationalmap.gov/ArcGIS/services/Orthoimagery/USGS_EROS_Ortho_NAIP/ImageServer/WMSServer
      layers: 0
    image:
      transparent_color: '#000000'
......


Also make sure to clear cache between the tests.

*Anna Pestereva*
<http://aerialservicesinc.com/photoblogmetry/>
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