Finer copies of a track for a map that zooms in: a 100-point outline suits
a list and looks blocky once a map zooms to one activity. Each level keeps the points needed to stay within
metres of the recorded line, so a map can draw the coarsest level whose
error is under a screen pixel (levelFor). Encoded like the
outline; the 112-mile Vineman bike comes to about 10 KB in all, against
1.8 MB for its track file.
Finer copies of a track for a map that zooms in: a 100-point outline suits a list and looks blocky once a map zooms to one activity. Each level keeps the points needed to stay within
metresof the recorded line, so a map can draw the coarsest level whose error is under a screen pixel (levelFor). Encoded like the outline; the 112-mile Vineman bike comes to about 10 KB in all, against 1.8 MB for its track file.