rectArea: Given rectangle code return area in square kilometers or...

In geo: Draw and Annotate Maps, Especially Charts of the North Atlantic

Description

Rectangle area is returned through a call to rectPeri-functions and geoarea.

Usage

rA(r, scale = "nmi")

srA(sr, scale = "nmi")

mrA(mr, dlat = 5, dlon = 10, scale = "nmi")

drA(dr, dlat = 1, dlon = 2, scale = "km")

Arguments

r,sr,mr,dr	rectangle code, as in rect2deg and deg2rect.
scale	nmi, km, default nmi returns values in square nautical miles for all except drA returns area in square kilometers.
dlat,dlon	Dimensions of latitude and longitude given in minutes and degrees for mrPeri and drPeri, respectively.

Value

Rectangle area in square nautical miles or kilometers.

Note

Unit nmi is used for historical/acoustical (sA) reasons.

See Also

rectPeri, deg2rect, geoarea.

Examples

srA(7121)
  srA(7121, "km")
  srA(7121, "km")/1.852^2
  srA(7121, "km")
  rA(712)
  srA(7121) + srA(7122) + srA(7123) + srA(7124)

geo documentation built on May 29, 2017, 5:36 p.m.