Re: [Libosmscout-development] Cannot get TYPE wood to render above level 10

[Tim T. <ti...@fr...>]

Hello Nicholas,

> In your example, what is the -r flag referring to? And what does  
> cell level mean?

"Relation".

-n/w/r => Load OSM node/way/relation by its id
-no/wo/ao => Load Libosmscout node/way/area by its offset
-rn => Load route node
-c => Load coordinate

Some options directly use an existing idex, other do full file scan.

Cell level:

static uint32_t CalculateCellLevel(const osmscout::GeoBox& boundingBox)
{
   uint32_t level=25;
   while (true) {
     if (boundingBox.GetWidth()<=osmscout::cellDimension[level].width &&
         boundingBox.GetHeight()<=osmscout::cellDimension[level].height) {
       break;
     }

     if (level==0) {
       break;
     }

     level--;
   }

   return level;
}

Level of the cell, by which the object would be completely contained.  
A measure for size and used by some indexes.

See for example DBThread.cpp:

       if (currentMagnification.GetLevel()>=15) {
         searchParameter.SetMaximumAreaLevel(6);
       }
       else {
         searchParameter.SetMaximumAreaLevel(4);
       }

Which means if you are at zoom level 15 show all object that  
completely fit in level <=currentLevel+6.
-- 
Gruß...
    Tim