Thread: map_changer_here_tomtom_osm_Titanic

This message only applies to versions of MapChanger that do not use external directory substitution for the content/map folder as in
[Only registered and activated users can see links. ]
but use igo's internal switching principle, as attempted in this and related topics.

I think I found a simple explanation to remember about the reality of how the mapchanger works

in the Map directory, we have gotten into the habit of placing for each country a mix of maps from various suppliers such as HERE, TOMTOM, OSM, BASARSOFT,....

I made cross-references on 3 countries (Belgium, Luxembourg and France) with the here and tomtom maps for the first two and OSM in addition for France.

In the different combinations I alternately selected MODEL.map.prefer_larger_supplierid with the values ​​false and true
I realized that each time here and tomtom were present for any country: here was associated with false and tomtom with true,
and for the mapchanger to be possible it was mandatory that one of the countries had at least two suppliers present.

So I kept the two maps of Belgium then made combinations with here tomtom and osm for France by varying the number from 1 to 3

it turned out that each time a systematic order resulted in HERE - TOMTOM - OSM in this order,
for each country igo analyzes the existence of the maps and catalogs them OBLIGATORILY as Map1 - Map2 - Map3 according to the previous order

so with MODEL.map.prefer_larger_supplierid to false the activated map is the first one that exists for the country (map1), but if it is true it is the second one found (map2), in the absence of a second one it is the first one found that is used if it exists

for different combinations of maps of any country according to availability, the mapchanger has the effect of selecting:

- 3 providers:
Map1(false)-Map2(true)-Map3(not used)

- 2 providers
Map1(false)-Map2(true)
Map1(false)-Map3(true)
Map2(false)-Map3(true)

- 1 provider
Map1(false)-Map1(true)
Map2(false)-Map2(true)
Map3(false)-Map3(true)

- 0 provider
nothing

we cannot therefore reasonably establish a general rule to name false and true by HERE TOMTOM or OSM in mapchanger, because it depends on the maps used for each country, we just have to imagine 3 countries individually having the pairs country1=HERE-TOMTOM , country2=HERE-OSM, country3=TOMTOM-OSM
by selecting FALSE the active maps would be country1=HERE , country2=HERE, country3=TOMTOM
by selecting TRUE the active maps would be country1=TOMTOM , country2=OSM, country3=OSM

It is not possible to choose a provider specifically for each country, the only solution is to use all the maps for 2 providers only at the same time and to be satisfied with naming the providers correctly in mapchanger