Hi WanMil, I agree that we should not support undocumented tagging. The question for me is whether the combination of type=associatedStreet and members with role=house whch have the addr:interpolation=* tag is documented. I fear the wiki is not clear about this. Regarding the normal use of addr:interpolation: I'll add some code to check if the evaluation is useful. I think it will improve results when the nodes of the way have no addr:street tag. The tag value in the addr:interpolation would also be interesting when it is a number, e.g. a value 3 in combination with housenumbers 2 and 20 mean 2,5,8,11,14,17,20, while a value 2 means even. I have no idea why someone would use that with numbers like 18, so maybe all the data using numbers is wrong. Gerd WanMil wrote
Hi Gerd, hi Andrzej,
yes, up to now mkgmap collects all elements (pois and polygons) tagged with addr:housenumber and mkgmap:street (which need to be set by the style). The elements are afterwards assigned to the nearby street with the same name. Elements more far away than 500m (?) are discarded. The street is then divided into segments and mkgmap tries to find the housenumbers at both ends and both sides of the segments. Additionally it checks if all housenumbers on one side of the segment are even/odd/both.
Relations like associatedStreet and addr:interpolation were not implemented by me because the quality was very very bad on the time of my implementation. Most useful addr:interpolation lines did have a start/stop point with adequate tagging (addr:housenumber and addr:street) so there wouldn't have been any quality gain by supporting it.
Now there might have been changes in the tagging quality. Although I would recommend to check that first. I strongly recommend to only support taggings how they are documented in the wiki. Otherwise mkgmap would support bad tagging which I think is not helpful at all.
WanMil
Hi Gerd,
isn't it a direct fit for Garmin format?
I don't know details, but I assume that cgpsmapper format is very straight description of internal structure of img. My understanding is that if you assign house numbers to two consecutive junctions, then GPS will interpolate addresses between these junctions. Cgpsmapper offer possibility to define different numbers for both sides of the road and settings like even/odd/both, which describe how interpolation should be computed. I guess mkgamp already has similar settings hidden somewhere in algorithms.
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