Comments (1)
From the chat:
< pnorman> Anyways, that's my guess as to what's happening. Let me dig into
the VTs
< pnorman> Yep, confirmed it. The VTs only contain the street and OSM ID
information. This means that the only possible place to get the
position information is from the VTs. MVTs are a NxN grid of
points (typ. N=4096), similar to how raster tiles are a MxM grid
of squares (typ. M=256). This means that there is an error in
saying where something is based on the VTs
< lonvia> So we should create them with higher resolution?
< pnorman> in particular, the error in meters is 40000000/2^z/N. Looking at
the VTs, I guess N to be 512, which puts the error at 20m at z10.
z10 is pretty far out, but with fractional zooms, you might be at
10.99, and that's a comfortable zoom for metro vancouver for
layers where there's only a couple of errors
< pnorman> Two approaches. The first, and easiest, is to increase the
resolution (extent) so that the error is < the bounding box buffer.
< pnorman> The right way is to add lat and lon attributes to the points in
the VT. This is actually important in the case of the place nodes
close layer, where you present two edit links, each of which
should go to their own location but doesn't.
from nominatim-data-analyser.
Related Issues (20)
- Updating QA vector tiles HOT 5
- Add "Last Update" to layer info
- Duplicate entries in layers.json
- Statistics over found issues HOT 4
- link this repository on published website HOT 1
- Add "address far away from its road" HOT 1
- Use service roads to help determine the "right" road for an address HOT 1
- take layer information into account on addr:streename check? HOT 3
- "place nodes close" does not take higher level admin borders into account? HOT 1
- False positives with "addr:* tags on non-addressable places" for place=farm HOT 1
- add link to parent HOT 3
- can't see last update info for some layers HOT 2
- False-positive for neighbouring place=square HOT 6
- Add an 'Open in JOSM' link in pop-up bubble
- Suspicious addr:street tag turns up results which aren't present on linked OSM object HOT 3
- waterway=boatyard can have addresses
- False negatives in "Suspicious addr:street tag" HOT 5
- Add documentation for clustering-vt
- Optimize supercluster-vt zoom descent.
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from nominatim-data-analyser.