projection.py 文件源码

def __eq__(self, other):
        """Return True if this projection object is the same as *other*.

        Note:  WRF can use either floats or doubles, so only going to 
        guarantee floating point precision equivalence, in case the different 
        types are ever compared (or a projection is hand constructed). For WRF
        domains, 7-digit equivalence should be good enough.

        """

        if self.map_proj is not None:
            if self.map_proj != other.map_proj:
                return False
        else:
            if other.map_proj is not None:
                return False

        # Only checking for floating point equal.
        ctx = Context(prec=7, rounding=ROUND_HALF_UP)

        return (WrfProj._context_equal(self.truelat1, other.truelat1, ctx) and
                WrfProj._context_equal(self.truelat2, other.truelat2, ctx) and
                WrfProj._context_equal(self.moad_cen_lat, other.moad_cen_lat, 
                                      ctx) and
                WrfProj._context_equal(self.stand_lon, other.stand_lon, 
                                       ctx) and
                WrfProj._context_equal(self.pole_lat, other.pole_lat, ctx) and
                WrfProj._context_equal(self.pole_lon, other.pole_lon, ctx) and
                WrfProj._context_equal(self.dx, other.dx, ctx) and
                WrfProj._context_equal(self.dy, other.dy, ctx))