大家都知道 Garmin 國外地圖有 Metroguide, City Select, 和 City Navigator
他們中間的差異為何 ?
國外的地圖有沒有像台灣提供 Taiwan Trail Map 也提供各國的 Trail Map ?
如何找到這些資源 ?
意思大概就是三種等級, 最完善的是 City Navigator 再來是 City Select 而 Metroguide 沒有導航功能, City Select 大概已經成熟, 但是 City Navigator 因為提供許多額外的服務, 所以還有機會一直升級
NavTeq basically sells 3 different 'levels', or qualities, of vector navigation data.
The basic level [Metroguide] does not support automatic route generation.
The intermediate level [City Select] supports automatic route generation, but does not contain certain 'high end' road attributes such as truck restrictions, time of day restrictions (City Select will avoid roads with time restrictions while City Nav will use them during the open hours. This is especially true with firmware version 4.30 ), stop signs per mile, mid-road barrier awareness, and various other road attributes.
The highest level [City Navigator] contains all those things, and is targeted for Garmin’s higher end GPS's.
Garmin has about 8 different levels of street classifications, all the way from pedestrian and animal pathways to multilane controlled access highways. For each roadway, there can be up to 60 invisible attributes, indicating the number of lanes, number of stop signs or traffic lights per mile, speed limits, presence of medians, time of day restrictions, heavy vehicle, pedestrian and bicycle restrictions, and so forth.
Whether these 60 pieces of data are included in the software or used by the GPS for its calculations is part of the feature set of the 3 map packages offered by Garmin.
- You get what you pay for ...
The following came from Seagull on Usenet.
1. City Navigator provides more detailed driving directions. This includes the text that is present on highway exit signs, giving you directions that include the sign text. e.g., you get:
"Exit 61 onto Helvetia Rd towards City Center"
instead of just
"Exit 61 onto Helvetia Rd".
2. City Navigator provides special handling for roundabouts, giving special directions. e.g.:
"Enter roundabout and then take second exit"
instead of
"turn right"
3. City Nav has more fine-grained routing properties for road classifications and speeds. This provides, in theory, better ETAs and sometimes different route choices.
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