[MapProxy] WMS service with a Tiles source

[Daniel Dye]

Hi,

I'm trying to configure my first MapProxy WMS service with a Tiles
source and I'm stuck.  The Openlayers Client isn't displaying tiles
east or south of Null Island (0N, 0W).  Here is the URI for that
client:
http://ec2-67-202-26-132.compute-1.amazonaws.com:8080/demo/?wms_layer=WeoGeo_MapView&format=image%2Fpng

At the minimum zoom, I see in the console output that these tiles are requested:
[2012-01-10 12:15:50,626] mapproxy.source.request - INFO - GET
http://mapview.weogeo.com/xyz/1/0/1.png 200 33.8 142
[2012-01-10 12:15:50,668] mapproxy.source.request - INFO - GET
http://mapview.weogeo.com/xyz/1/0/0.png 200 26.1 184

I would have expected /0/0/1.png and /0/0/0.png at that zoom level for
my EPSG:4326 tiles source.

The WMS service has similar symptoms: the returned image covers twice
the area that I'm expecting (see attached screenshot), which seems
reasonable if z is off-by-one.

So, is there some way to configure z to start counting from zero
rather than one?  Or, perhaps this a red herring and I'm just making a
silly mistake in my configuration?

Here is my complete config and thanks in advance for any help!
---
services:
  kml:
  demo:
  tms:
  wms:
    srs: ['EPSG:4326']
    image_formats: ['image/jpeg', 'image/png']
    md:
      title: MapProxy WMS Proxy
      abstract: This is the fantastic MapProxy.
      online_resource: http://mapproxy.org/
      contact:
        person: Your Name Here
        position: Technical Director
        organization:
        address: Fakestreet 123
        city: Somewhere
        postcode: 12345
        country: Germany
        phone: +49(0)000-000000-0
        fax: +49(0)000-000000-0
        email: info at omniscale.de
      access_constraints:
        This service is intended for private and evaluation use only.
        The data is licensed as Creative Commons Attribution-Share Alike 2.0
        (http://creativecommons.org/licenses/by-sa/2.0/)
      fees: 'None'

layers:
  - name: WeoGeo_MapView
    title: WeoGeo MapView
    sources: [my_cache]

caches:
  my_cache:
   sources: [my_source]
   grids: [my_grid]
   meta_buffer: 0
   meta_size: [1,1]
   disable_storage: true
   watermark:
     text: WeoGeo
     opacity: 255
     font_size: 44

sources:
  my_source:
    type: tile
    url: http://mapview.weogeo.com/xyz/%(z)s/%(y)s/%(x)s.png
    origin: nw
    grid: my_grid

grids:
  my_grid:
    base: GLOBAL_GEODETIC
    tile_size: [256, 256]
    bbox: [-180, -90, 180, 90]
    bbox_srs: 'EPSG:4326'

globals:
  cache:
    base_dir: './cache_data'
    lock_dir: './cache_data/locks'
  image:
    resampling_method: nearest
---

Regards,
Dan

-- 
____________________
Daniel Dye
WeoGeo, Inc.

Phone - (813) 235-4802
Web - www.weogeo.com
Linkedin - www.linkedin.com/in/dandye
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