[MapProxy] Global Mercator Zoom 20

[Ian Reese]

Hi MapProxy,

I'm using:

mapproxy-util --version
MapProxy 1.11.0
Ubuntu 16.04

When attempting a dry run using maproxy util.

time mapproxy-seed --dry-run -f  ~/maptiles.test.yml -s ~/seeds.test.yml --progress-file .mapproxy_seed_pgress

I am hoping to get a rough count of tiles produced for Zoom 20 in GLOBAL_WEBMERCATOR.

MAPTILES GRID CONFIG:

grids:
  GLOBAL_WEBMERCATOR:
    srs: EPSG:3857
    origin: nw


SEED CONFIG:

  test_main:
    caches: [cache_web_mercator_testing]
    grids: [GLOBAL_WEBMERCATOR]
    coverages: [nz_mainland]
    levels: [20]

All dry runs work fine until zoom 20 and above.  At Zoom 20 I get an error:

========== Seeding tasks ==========
Start seeding process (1 task)
  test_main:
    Seeding cache 'cache_web_mercator_testing' with grid 'GLOBAL_WEBMERCATOR' in EPSG:3857
    Limited to coverage in: 165.42907, -47.85948, 179.37452, -33.43041 (EPSG:4326)
    Levels: []
    Overwriting: no tiles
Traceback (most recent call last):
  File "/usr/local/bin/mapproxy-seed", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/mapproxy/seed/script.py", line 361, in main
    return SeedScript()()
  File "/usr/local/lib/python2.7/dist-packages/mapproxy/seed/script.py", line 246, in __call__
    skip_geoms_for_last_levels=options.geom_levels)
  File "/usr/local/lib/python2.7/dist-packages/mapproxy/seed/seeder.py", line 495, in seed
    seed_progress=seed_progress)
  File "/usr/local/lib/python2.7/dist-packages/mapproxy/seed/seeder.py", line 514, in seed_task
    seed_progress=seed_progress)
  File "/usr/local/lib/python2.7/dist-packages/mapproxy/seed/seeder.py", line 290, in __init__
    self.report_till_level = task.levels[num_seed_levels-1]
IndexError: list index out of range

If I hard code the resolutions to the GLOBAL_MERCATOR grid config:

grids:
  GLOBAL_WEBMERCATOR:
    srs: EPSG:3857
    origin: nw
    res: [156543.03, 78271.52, 39135.76, 19567.88, 9783.94, 4891.97, 2445.98, 1222.99, 611.50, 305.75, 152.87, 76.44, 38.22, 19.11, 9.55, 4.78, 2.39, 1.19, 0.60, 0.30, 0.15, 0.07]

The error goes away, however I get vastly different tile counts.

I have come across this error for years now.  I am writing to ask if there is a hard limit on GLOBAL_WEBMERCATOR or if this is a bug in MapProxy?  I really need to be able to seed to zoom 20.

Cheers,

Ian

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