| 1 |
edhill |
1.1 |
% |
| 2 |
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% Ed Hill |
| 3 |
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% |
| 4 |
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% Generate approximate bathymetry for the llc grid |
| 5 |
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% |
| 6 |
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| 7 |
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% clear all ; close all |
| 8 |
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| 9 |
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do_print = 0; |
| 10 |
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dbug = 0; |
| 11 |
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| 12 |
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% Get the ETOPO2 data |
| 13 |
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disp('Reading the ETOPO2 data...'); |
| 14 |
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nlat = 5400; |
| 15 |
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nlon = 10800; |
| 16 |
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lons = linspace(-180, (180 - 2/60), nlon); |
| 17 |
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lats = linspace(90, -(90 - 2/60), nlat); |
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fid = fopen('ETOPO2.raw.bin', 'r', 'ieee-be'); |
| 19 |
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et2 = reshape( fread(fid, nlat*nlon, 'int16'), [ nlon nlat ]); |
| 20 |
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fid = fclose(fid); |
| 21 |
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| 22 |
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if dbug > 10 |
| 23 |
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surf( et2(1:500,1:500) ), view(2), shading flat |
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ilon = [ 1:10:5000 ]; |
| 25 |
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ilat = [ 1:10:5400 ]; |
| 26 |
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surf(lons(ilon), lats(ilat), et2(ilon,ilat)'), view(2), ... |
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shading flat, axis equal |
| 28 |
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end |
| 29 |
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| 30 |
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% Get the llc grid information |
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disp('Reading the grid information...'); |
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fnc_in = 'llc_p90_%d.nc'; |
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vnms = { 'XC' 'YC' 'XG' 'YG' }; |
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d2r = pi/180.0; |
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ginfo = {}; |
| 36 |
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for k = 1:5 |
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nc = netcdf(sprintf(fnc_in,k),'nowrite'); |
| 38 |
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for j = 1:length(vnms) |
| 39 |
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eval(sprintf('ginfo(k).%s = nc{''%s''}(:);',vnms{j},vnms{j})); |
| 40 |
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end |
| 41 |
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nc = close(nc); |
| 42 |
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| 43 |
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% compute 3D coords of the C and G points |
| 44 |
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cor = zeros( [ size(ginfo(k).XG) 3 ]); |
| 45 |
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[cor(:,:,1),cor(:,:,2),cor(:,:,3)] = sph2cart( ginfo(k).XG*d2r, ... |
| 46 |
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ginfo(k).YG*d2r,1 ); |
| 47 |
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cen = zeros( [ size(ginfo(k).XC) 3 ]); |
| 48 |
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[cen(:,:,1),cen(:,:,2),cen(:,:,3)] = sph2cart( ginfo(k).XC*d2r, ... |
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ginfo(k).YC*d2r,1 ); |
| 50 |
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ginfo(k).cor = cor; |
| 51 |
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ginfo(k).cen = cen; |
| 52 |
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| 53 |
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% empty bathy |
| 54 |
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ginfo(k).bathy = zeros(size( size(ginfo(k).XC) )); |
| 55 |
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end |
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| 57 |
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% Do a quick-and-dirty regrid |
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disp('Performing the regrid...'); |
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s_lon = -37; |
| 60 |
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s_lat = 0.0; |
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for k = 1:5 |
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disp(sprintf(' k = %d',k)); |
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% |
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% / i,j+1 i+1,j+1 \ |
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% \ i,j i+i,j / |
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for j = 1:size(ginfo(k).XC,2) |
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jr = [ j j+1 ]; |
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for i = 1:size(ginfo(k).XC,1) |
| 69 |
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ir = [ i i+1 ]; |
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lon_min = min(min( ginfo(k).XG(ir,jr) + s_lon )); |
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lon_max = max(max( ginfo(k).XG(ir,jr) + s_lon )); |
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lat_min = min(min( ginfo(k).YG(ir,jr) + s_lat )); |
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lat_max = max(max( ginfo(k).YG(ir,jr) + s_lat )); |
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% [ lon_min lon_max lat_min lat_max ] |
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lon_mm = [ mod(lon_min + 180,360)-180 ... |
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mod(lon_max + 180,360)-180 ]; |
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lon_min = min(lon_mm); |
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lon_max = max(lon_mm); |
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d_lon = lon_max - lon_min; |
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if (abs(d_lon) > 45 && lat_min < 88) |
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i_lon = find( lons >= lon_max ... |
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| lons <= lon_min ); |
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else |
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i_lon = find(lon_min <= lons & lons <= lon_max); |
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end |
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i_lat = find(lat_min <= lats & lats <= lat_max); |
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% average the bathy |
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bv = et2(i_lon,i_lat); |
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if length(bv(:)) > 1 |
| 92 |
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ginfo(k).bathy(i,j) = mean(bv(:)); |
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else |
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% If not averaging, then interpolate |
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% ginfo(k).bathy(i,j) = NaN; |
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i_lon = interp1(lons,[1:length(lons)],lon_min,'nearest'); |
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i_lat = interp1(lats,[1:length(lats)],lat_min,'nearest'); |
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ginfo(k).bathy(i,j) = et2(i_lon,i_lat); |
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end |
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end |
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end |
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end |
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% Plot the resulting bathymetry |
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k = 3; |
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for k = 1:5 |
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disp(sprintf(' k = %d',k)); |
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ginfo(k).b_oce = ginfo(k).bathy; |
| 109 |
edhill |
1.2 |
% ginfo(k).b_oce(find(ginfo(k).b_oce >= 0.0)) = NaN; |
| 110 |
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ginfo(k).b_oce(find(ginfo(k).b_oce >= 0.0)) = 1000; |
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if k == 2 |
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hold on |
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end |
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% figure(k) |
| 115 |
edhill |
1.1 |
surf( ginfo(k).cor(:,:,1), ... |
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ginfo(k).cor(:,:,2), ... |
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ginfo(k).cor(:,:,3), ginfo(k).b_oce ) |
| 118 |
edhill |
1.2 |
if k == 5 |
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hold off |
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end |
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edhill |
1.1 |
end |
| 122 |
edhill |
1.2 |
axis equal, view(2) |
| 123 |
edhill |
1.1 |
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| 125 |
edhill |
1.3 |
% Plot the bathymetry at 1/2 resolution |
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k = 3; |
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for k = 1:5 |
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disp(sprintf(' k = %d',k)); |
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ginfo(k).c_half = ginfo(k).cor(1:2:end,1:2:end,:); |
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ginfo(k).b_half = ginfo(k).bathy(1:2:end,1:2:end); |
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ginfo(k).b_half(find(ginfo(k).b_half >= 0.0)) = 1000; |
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if k == 2 |
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hold on |
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end |
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% figure(k) |
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surf( ginfo(k).c_half(:,:,1), ... |
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ginfo(k).c_half(:,:,2), ... |
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ginfo(k).c_half(:,:,3), ginfo(k).b_half ) |
| 139 |
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if k == 5 |
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hold off |
| 141 |
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end |
| 142 |
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end |
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axis equal, view(2) |
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| 145 |
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| 146 |
edhill |
1.1 |
if do_print > 0 |
| 147 |
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print -depsc llc_bathy.eps |
| 148 |
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end |
| 149 |
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| 150 |
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| 151 |
edhill |
1.2 |
% Write the bathymetry to netCDF compatible with MNC |
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id = 'bathy'; |
| 153 |
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units = 'm'; |
| 154 |
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for k = 1:5 |
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disp(sprintf(' k = %d',k)); |
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ginfo(k).b_out = ginfo(k).bathy; |
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ginfo(k).b_out(find(ginfo(k).bathy >= 0.0)) = 0.0; |
| 158 |
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bfile = sprintf('llc_p90_bathy.f%03d.nc',k); |
| 159 |
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nc = netcdf(bfile, 'clobber'); |
| 161 |
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nc.reference = 'bathymetry'; |
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nc.author = 'Ed Hill <eh3@mit.edu>'; |
| 163 |
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nc.date = eval('date'); |
| 164 |
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nc('X') = size( ginfo(k).XC, 1 ); |
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nc('Y') = size( ginfo(k).XC, 2 ); |
| 166 |
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nc{ id } = { 'Y', 'X' }; |
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nc{ id }.units = units; |
| 168 |
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nc{ id }(:) = ginfo(k).b_out'; |
| 169 |
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nc = close(nc); |
| 170 |
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end |
| 171 |
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| 172 |
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% Write the bathymetry to a set of 90-by-90 per-tile MDSIO-compatible |
| 173 |
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% files |
| 174 |
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% face is js |
| 175 |
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iti = [ 1 1 1 ; ... |
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1 91 1 ; ... |
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1 181 1 ; ... |
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1 271 1 ; ... |
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2 1 1 ; ... |
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2 91 1 ; ... |
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2 181 1 ; ... |
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2 271 1 ; ... |
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3 1 1 ; ... |
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4 1 1 ; ... |
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4 1 91 ; ... |
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4 1 181 ; ... |
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4 1 271 ; ... |
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5 1 1 ; ... |
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5 1 91 ; ... |
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5 1 181 ; ... |
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5 1 271 ]; |
| 192 |
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for k = 1:size(iti,1) |
| 193 |
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disp(sprintf(' k = %d',k)); |
| 194 |
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fname = sprintf('bathy.%03d.001.data',k); |
| 195 |
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fid = fopen(fname, 'w', 'ieee-be'); |
| 196 |
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% be careful of index orientation |
| 197 |
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is = iti(k,3); ie = is + 90 - 1; |
| 198 |
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js = iti(k,2); je = js + 90 - 1; |
| 199 |
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tmp = ginfo(iti(k,1)).b_out(is:ie,js:je)'; |
| 200 |
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surf(tmp), view(2), axis equal, shading flat, pause(1) |
| 201 |
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fwrite(fid,tmp,'real*8',0,'ieee-be'); |
| 202 |
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fclose(fid); |
| 203 |
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end |
| 204 |
edhill |
1.1 |
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