Zones, Lunes, Quadrangles, and Other Areas

Find areas bounded by meridians and parallels or by intersections of polygons

Functions

`areaint`	Surface area of polygon on sphere or ellipsoid
`areamat`	Surface area covered by nonzero values in binary data grid
`areaquad`	Surface area of latitude-longitude quadrangle
`bufgeoquad`	Expand limits of geographic quadrangle
`geoquadline`	Geographic quadrangle bounding multi-part line
`geoquadpt`	Geographic quadrangle bounding scattered points
`ingeoquad`	True for points inside or on lat-lon quadrangle
`intersectgeoquad`	Intersection of two latitude-longitude quadrangles
`outlinegeoquad`	Polygon outlining geographic quadrangle

Measure Area of Spherical Quadrangles
A quadrangle is a region bounded by parallels north and south, and meridians east and west.