[mkgmap-dev] open issues in the housenumber2 branch

Sun Mar 1 09:31:03 GMT 2015

Gerd, can you explain how addresses are stored in the Garmin maps? Are
they millions of individual nodes, or "interpolation ways" with a start
and an end? Are they just coordinates, or are they internally linked to
a road in some way? Can it handle non-numeric house numbers?
Understanding the "target data model" might help to assess all the
possibilities we have in interpreting the data from OSM. 

Colin 

On 2015-03-01 09:42, Gerd Petermann wrote: 

> Hi all,
> 
> during the last days I've analysed the reasons for the error messages reported
> by some of you. I came to the conclusion that I have to 
> - change the handling of addr:interpolation ways completely
> - add code to detect the "random number" case earlier and - if detected - 
> use different methods to split the number intervals
> 
> Both are rather complex changes, so I'll need a few days to code this.
> 
> One open question for you:
> How should we handle "missing" information?
> If mkgmap finds the numbers 1,3,9,11,17 in that order on the left side
> of a road called ABC, it can create different housenumber informations.
> One could be like "odd numbers from 1 to 17 on the left",
> another could be a more complex sequence 
> 1) "odd numbers from 1 to 3 on the left",
> 2)"odd numbers from 9 to 11 on the left",
> 3) "odd number 17 on the left"
> A search for ABC 5 would either show a point between 3 and 9
> or two entries with the numbers 3 and 9.
> The latter tells you that OSM probably doesn't contain the 
> exact information and let's you decide where to search for ABC 5.
> 
> The trunk version tends to the simple info, while r3486 
> is more likely to produce the complex one.
> I think trunk is better here, the complex case should only
> occur if the "random number" case was detected.
> 
> Do you agree?
> 
> Gerd
> 
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> mkgmap-dev at lists.mkgmap.org.uk
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