Mapping Toolbox

eqa2grn

Convert from equal area to Greenwich coordinates

Syntax

• [lat,lon] = eqa2grn(x,y)
  [lat,lon] = eqa2grn(x,y,origin)
  [lat,lon] = eqa2grn(x,y,origin,geoid)
  [lat,lon] = eqa2grn(x,y,origin,units)
  [lat,lon] = eqa2grn(x,y,origin,geoid,units)
  mat = eqa2grn(x,y,origin...)
  

Description

This command converts data from equal-area x-y-coordinates to Greenwich (latitude-longitude) coordinates. The opposite conversion can be performed with grn2eqa.

[lat,lon] = eqa2grn(x,y) converts the equal-area coordinate points x and y to the Greenwich coordinates lat and lon.

[lat,lon] = eqa2grn(x,y,origin) specifies the location in the Greenwich system of the x-y origin (0,0). The two-element vector origin must be of the form [latitude longitude]. The default places the origin at the Greenwich coordinates (0°,0°).

[lat,lon] = eqa2grn(x,y,origin,geoid) specifies the two-element geoid vector describing the ellipsoidal model of the figure of the Earth. The geoid is spherical by default.

[lat,lon] = eqa2grn(x,y,origin,units) specifies the units for the outputs, where units is any valid angle units string. The default value is 'degrees'.

mat = eqa2grn(x,y,origin...) packs the outputs into a single variable.

Examples

• [lat,lon] = eqa2grn(.5,.5)
  lat =
     30.0000
  lon =
     28.6479
  

See Also

grn2eqa	Convert Greenwich coordinates to equal-area coordinates
hista	Equal area histogram

epsm

extractm