[Tagging] Housenumber interpolation with regularlyskippednumbers

Randy Thomson rwtnospam-osm at yahoo.com
Thu Oct 15 07:50:43 BST 2009

Martin Koppenhoefer wrote:

> actually I think that instead of discussing interpolation with
> regularlyskipped numbers you could map explicitly the nodes of the
> real numbers, thus getting a high-precision map instead of this
> interpolation-crab, that is much less useful then an actual accurate
> position ;-)
> just my 2 cents.
> cheers,
> Martin

Sounds good Martin. I have about 3000-5000 houses to tag, I'll tag the
beginning and ending house addresses, on each street, if you'll tag the
15-20 individual houses in between. They're in the satellite images, so
it shouldn't be a problem.

Just kidding, but hopefully you'll get the point that it's a pretty
labor intensive job, and interpolation, with an appropriate skip factor
would make the job a lot more likely to eventually reach completion.

In the area I'm working, most of the lots on these streets have fairly
uniform width at the street, so interpolation will rarely be in error
by a full physical street address.

Some of this has been said before, but unfortunately this subject got
hijacked to something about comparing Tiger vs. Karlsruhe schemae and
you have to go back a few days to find the discussion that truly
relates to the subject of the thread.

Based on Richard Bullock's suggestion, I have added the numeric
increment to the definition for the tag addr:interpolation=*, and
additional information under Using interpolation on the Key:addr wiki
page. I'll start tagging street addresses this way as soon as time

I noticed that Mapnik already renders the way properly, although there
is no way to verify the increment. OSMARender apparently detects an
invalid interpolation value and renders the end point nodes, but not
the way, at present.

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