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Ticket #1120 (closed enhancement: fixed)

Opened 2 years ago

Last modified 9 months ago

Polar-derived minimum zoom levels

Reported by: staylo Owned by: Turbo
Priority: low Milestone: XCSoar 6.5
Component: Map Version: unspecified
Keywords: polar zoom paraglider mapwindow cruise climb Cc:

Description (last modified by Turbo) (diff)

Paraglider suggestion: TiGuy? @ ​http://www.paraglidingforum.com/viewtopic.php?p=247423

  • Better Zoom (60 - 150m on thermal mode, 100 - 2km on the Cruise mode)

My suggested implementation:

  • Set minimum scale based on current polar.

From IRC:

  • < jmw> (...) minimum turning radius depends on speed; R scales as V2

Climb: Estimate turning circle at minimum sink, minimum zoom level should allow the entire circle to cover at least 2/3rds of the screen.
.
Cruise: Estimate distance covered over a set period (30s? 60s?) at stall speed.

  • Assuming a PG stall speed of 20kph (5.55m/s): 165m (150m) covered over 30s.

Change History

comment:1 Changed 9 months ago by Turbo

  • Owner set to Turbo
  • Status changed from new to assigned
  • Description modified (diff)
  • Milestone changed from XCSoar Wishlist to XCSoar 6.5

comment:2 Changed 9 months ago by Turbo

my master has a patch to set the minimum zoom level down to 100m. making the zoom level depend on the polar is only a good idea if the polar interpolation is rather precise in the low airspeed area. for our built-in polars this doesn't seem to be the case as the ASH-25 has a lower minimum airspeed than the paraglider polars...

comment:3 Changed 9 months ago by Turbo

  • Status changed from assigned to closed
  • Resolution set to fixed
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