Global Heatmap
       256px: /global/:color/:activity/{z}/{x}/{y}@small.png
       512px: /global/:color/:activity/{z}/{x}/{y}.png
      1024px: /global/:color/:activity/{z}/{x}/{y}@2x.png

      colors: mobileblue, orange, hot, blue, bluered, purple, gray
  activities: all, ride, winter, run, water, ...


Personal Heatmap
       512px: /personal/:color/:activity/{z}/{x}/{y}.png
      1024px: /personal/:color/:activity/{z}/{x}/{y}@2x.png

      colors: orange, hot, blue, bluered, purple, gray
  activities: all, ride, winter, run, water, ...


Additional Activity Types
    sport_AlpineSki
    sport_BackcountrySki
    sport_Badminton
    sport_Canoeing
    sport_EBikeRide
    sport_EMountainBikeRide
    sport_Golf
    sport_GravelRide
    sport_Handcycle
    sport_Hike
    sport_IceSkate
    sport_InlineSkate
    sport_Kayaking
    sport_Kitesurf
    sport_MountainBikeRide
    sport_NordicSki
    sport_Pickleball
    sport_Ride
    sport_RockClimbing
    sport_RollerSki
    sport_Rowing
    sport_Run
    sport_Sail
    sport_Skateboard
    sport_Snowboard
    sport_Snowshoe
    sport_Soccer
    sport_StandUpPaddling
    sport_Surfing
    sport_Swim
    sport_Tennis
    sport_TrailRun
    sport_Velomobile
    sport_VirtualRide
    sport_VirtualRow
    sport_VirtualRun
    sport_Walk
    sport_Wheelchair
    sport_Windsurf