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maning / osmphgps

Scripts and styles for creating the osmph GPS maps
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too much noise for street/address search results #34

Closed maning closed 13 years ago

maning commented 13 years ago

On Thu, Jul 7, 2011 at 3:39 PM, Jun Martin

Yes, I tried Saint John and Saint John Street, the first one has no matches (but there is a Saint John). Same thing for Saint Luke and Saint Luke Street.

On 7/7/2011 3:30 PM, maning sambale wrote:

Just tried "Sampaloc Road" and I can find it. But you're right some streets have names but when you tapped them (e.g. Sampaloc), the "No Matches Found" appear.

ralleon commented 13 years ago

Without mkgmap-locator and without address tags on roads, what's the basis of mkgmap r1867 to assign road's address to specific town or city? Most probably, the roads are associated by mkgmap to a city, if they fall within a certain radius from the nearest city-poi. This becomes a complicated issue with irregular shaped city boundaries in NCR.

Or is it possible that if a road is very far from city-POI (outside a given radius), it's not indexed, thus cannot be searched? just a guess.

maning commented 13 years ago

Just to add to your guess, I think regardless of what you specify as your City, street search gives out all the possible streets in your specified query that is contained within the tile. However, when you tap on each street name, the only valid street within the city will show a match.

Moreover, if the place node is on another tile, you can't get any match at all. :(

ralleon commented 13 years ago

"the only valid street within the city will show a match" ---but assuming the shape of a city-A is long and narrow (eg. like a leech), and it's city-POI is located on the center of its polygon, the streets at its far end will become nearer to adjacent city-POI of a nearby City-B. In which case, without a locator, that far-end streets will become associated to City-B during the indexing (due to nearer radius proximity)

On address search, if you type City-A, then look for that said streets, chances are you'll get a blank result (no match). Maybe this is what's happening.

maning commented 13 years ago

Seems to be fixed with the mkgmap-city-region-index-r1992. Will wait for more reports before closing this issue.