Gaussian Grid -------- ---- The Gaussian grid is the model's native grid. The location of the grid points were selected so that a Gaussian quadrature could be used when transforming the grid into spherical harmonics. The Gaussian latitudes turn out to be the zeros of the Legendre polynomial. There is an article on spectral modelling in the book "Methods in Computation Physics, Volume 17 General Circulation Models of the Atmosphere." The Gaussian grid is like a regular lat-lon grid except the latitude spacing is unequal. For Reanalysis, nlon=192, nlat=94. These are the Gaussian latitudes for the 192x94 grid: Note 1st grid point is at (88.542N 0E), the 2nd grid point is at (88.542N, 1.875E), the 192th point is at (88.542N, 1.875W), and the 193th point is at (86.653N, 0E). 88.542 86.653 84.753 82.851 80.947 79.043 77.139 75.235 73.331 71.426 69.522 67.617 65.713 63.808 61.903 59.999 58.094 56.189 54.285 52.380 50.475 48.571 46.666 44.761 42.856 40.952 39.047 37.142 35.238 33.333 31.428 29.523 27.619 25.714 23.809 21.904 20.000 18.095 16.190 14.286 12.381 10.476 8.571 6.667 4.762 2.857 0.952 -0.952 -2.857 -4.762 -6.667 -8.571 -10.476 -12.381 -14.286 -16.190 -18.095 -20.000 -21.904 -23.809 -25.714 -27.619 -29.523 -31.428 -33.333 -35.238 -37.142 -39.047 -40.952 -42.856 -44.761 -46.666 -48.571 -50.475 -52.380 -54.285 -56.189 -58.094 -59.999 -61.903 -63.808 -65.713 -67.617 -69.522 -71.426 -73.331 -75.235 -77.139 -79.043 -80.947 -82.851 -84.753 -86.653 -88.542