tecznotes

Michal Migurski's notebook, listening post, and soapbox. Subscribe to this blog. Check out the rest of my site as well.

Jan 6, 2013 7:31pm

loading artifacts, google maps for iOS

The new GMaps for iOS uses the same/similar vector loading process as its longtime Android counterpart. The high-res stuff, including buildings and tiny streets, looks like it comes in right at zoom level 16, which is about where I would’ve put it given the choice.

The transition between zooms is a bit odd. I would not have expected the difference in street widths between the loaded and unloaded sections here. OpenGL does how (as far as I know) have its own concepts like round line caps or joins, so maybe there’s some client-side buffering these that’s expensive to run more than once per geometry load? The “hot dog” street endings show that each tile’s worth of geometry data comes clipped; I haven’t tested to see whether street names straddle z16 tile boundaries or not.

Interestingly, GMaps makes no attempt to model elevated freeways, terrain, or anything else vertical beyond buildings. In use, this feels like a satisfactory compromise. The road names here are in perspective, applied to the ground as textures, while the route numbers are all billboards facing forward.

I’m not sure why the Grand Avenue label below is not tilted back like Elita or Perkins.

The translucent handling of the building is very good. It’s sketchy enough that you can recognize them and navigate without being distracted by their incompleteness.

August 2015
Su M Tu W Th F Sa
      
     

Recent Entries

  1. a historical map for moving bodies, moving culture
  2. the other openstreetmap churches post
  3. platforminess, smartness, and meaningfulness
  4. writing a new continuous integration service for openaddresses
  5. state of the map 2015
  6. bike ten: schwinn touring, v2
  7. blog all oft-played tracks VI
  8. 2015 fellowship reader
  9. bike ten: schwinn touring
  10. more open address machine
  11. open address machine
  12. making the right job for the tool
  13. the hard part
  14. end the age of gotham-everywhere
  15. on this day
  16. write code
  17. managers are awesome / managers are cool when they’re part of your team
  18. bike eight: french parts
  19. being a client
  20. bike seven: building a cargo bike

Archives