Example #1
0
def gdllval(uuin, vvin, lat, lon, nij, grtyp, refparam, xyAxis, hasAxis, ij0):
    """Interpolate scalar or vector fields to scattered (lat, lon) points
    vararg = Fstdc.gdllval(uuin, vvin, lat, lon,
        (ni, nj), grtyp, (grref, ig1, ig2, ig3, ig4), (xs, ys), hasAxis, (i0, j0))
    @param (uuin, vvin): Fields to interpolate from; if vvin is None then
                        perform scalar interpolation
    @param lat, lon:  Latitude and longitude coordinates for interpolation
    @param ni ... j0: grid definition parameters
    @return Zout or (UU, VV): scalar or tuple of grid-directed,
                             vector-interpolated fields, as appropriate
    """
    try:
        gid = _getGridHandle(nij[0], nij[1], grtyp,
                             refparam[0], refparam[1], refparam[2],
                             refparam[3], refparam[4],
                             ij0[0], ij0[1], xyAxis[0], xyAxis[1])
    except:
        raise error("gdllval: Invalid Grid Desc")
    try:
        if vvin == None:
            return _rmn.gdllsval(gid, lat, lon, uuin)
        else:
            return _rmn.gdllvval(gid, lat, lon, uuin, vvin)
    except:
        raise error("gdllval: Problem interpolating")
Example #2
0
 def test_gdllvval(self):
     gp1 = self.getGridParams_L()
     gid1 = rmn.ezqkdef(gp1)
     self.assertTrue(gid1>=0)
     zin  = np.empty(gp1['shape'],dtype=np.float32,order='FORTRAN')
     zin2 = np.empty(gp1['shape'],dtype=np.float32,order='FORTRAN')
     for x in xrange(gp1['ni']):
         zin[:,x] = x
         zin2[:,x] = x+1
     lat = np.array([gp1['lat0']+gp1['dlat']/2.],dtype=np.float32,order='FORTRAN')
     lon = np.array([(gp1['lon0']+gp1['dlon'])/2.],dtype=np.float32,order='FORTRAN')
     (zout,zout2) = rmn.gdllvval(gid1,lat,lon,zin,zin2)
     self.assertEqual(lat.shape,zout.shape)
     self.assertEqual(lat.shape,zout2.shape)
     self.assertTrue(abs((zin[0,0]+zin[1,1])/2. - zout[0]) < self.epsilon)
     self.assertTrue(abs((zin2[0,0]+zin2[1,1])/2. - zout2[0]) < self.epsilon)
     rmn.gdrls(gid1)