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I have a query based vector layer in my TileStache configuration, and it's hitting this block of code

if layer.GetSpatialRef() is None and driver_name != 'SQLite': 
    raise KnownUnknown('Couldn\'t get a layer from data source %s' % source_name)```

and failing, because the GetSpatialRef() is returning None. Is there a parameter that I am missing in my configuration? I've tried giving it projected=True and projected=False, with no change in results.

TileStache 1.49.10 on Ubuntu 14.04 with Mapnik 2.3 (not that Mapnik is even used for the vector provider) and PostGIS 2.1 (upgrading from postGIS 1.5.x).

  • Could you post your TileStache config file? It is most likely a configuration issue. – Jesse Crocker May 27 '14 at 23:09
  • sure, although i dynamically generate my configs (100s of layers) so this is patched together from print obj.__dict__ calls: pastebin.com/22ywgW7W – probabble May 27 '14 at 23:53
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The problem was not in my configuration or even with TileStache, but in my geometry_columns view in my DB. The geometry requested by my query had a SRID of 0 in that view (?!) and manually fixing that fixed TileStache's complaint.

tl:dr; TileStache was right. I should have listened.

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