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[mkgmap-dev] Incorrectly interpolated numbers in small segment of a street

From GerdP gpetermann_muenchen at hotmail.com on Sun Feb 9 17:24:32 GMT 2014

Hi Paulo,

Garmin format uses a grid with 24 bits. That means ~ 40000km / 2^24  =>
~2.38 m 
is the highest possible resolution at the equator. OSM precision is a few


Paulo Carvalho wrote
> Thanks, Steve.  I just wanted to make sure mkgmap would find the numbers
> by
> keeping them as close as possible.  I'll follow your advice to take the
> numbers a few meters apart, just like they are the real world.  If you're
> using 32-bit floats for coordinates then we indeed have to take them
> apart.
>  I think the 32-bit resolution is 7-digit, and that translates to about 5m
> at the Equator (less at higher latitudes).
> all the best,
> Paulo
> 2014-02-09 11:55 GMT-02:00 Steve Ratcliffe <

> steve at .me

> >:
>> Hi
>> On 08/02/14 13:44, Paulo Carvalho wrote:
>>>    The attached OSM file is what I'm using in my tests.  I'm now able to
>>> compile the map with the house numbers ok.  But there is a problem
>>> (bug?).  Only a street called "Rua Armando Santos" has street numbers.
>> Thanks for the good example.
>> It seems that the house numbers are very close to the road and in this
>> case mkgmap mistakes the side of the road for one or two of the numbers.
>> When I moved the nodes in josm just so they were the same distance
>> apart as the others on the road then it worked.
>> This is I guess because they are less than 2m apart an so appear to
>> be the same in mkgmap.  The work that Gerd is doing on the
>> high-prec-coord branch should make it possible to fix this.
>> I would not normally suggest changing the data, but when viewed with
>> the background imagery the points don't look to be on opposite sides
>> of the road, so it would perhaps be appropriate in this case.
>> Best wishes
>> ..Steve
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