| 1 |
% |
| 2 |
% Ed Hill |
| 3 |
% |
| 4 |
% Generate approximate bathymetry for the llc grid |
| 5 |
% |
| 6 |
|
| 7 |
% clear all ; close all |
| 8 |
|
| 9 |
do_print = 0; |
| 10 |
dbug = 0; |
| 11 |
|
| 12 |
% Get the ETOPO2 data |
| 13 |
disp('Reading the ETOPO2 data...'); |
| 14 |
nlat = 5400; |
| 15 |
nlon = 10800; |
| 16 |
lons = linspace(-180, (180 - 2/60), nlon); |
| 17 |
lats = linspace(90, -(90 - 2/60), nlat); |
| 18 |
fid = fopen('ETOPO2.raw.bin', 'r', 'ieee-be'); |
| 19 |
et2 = reshape( fread(fid, nlat*nlon, 'int16'), [ nlon nlat ]); |
| 20 |
fid = fclose(fid); |
| 21 |
|
| 22 |
if dbug > 10 |
| 23 |
surf( et2(1:500,1:500) ), view(2), shading flat |
| 24 |
ilon = [ 1:10:5000 ]; |
| 25 |
ilat = [ 1:10:5400 ]; |
| 26 |
surf(lons(ilon), lats(ilat), et2(ilon,ilat)'), view(2), ... |
| 27 |
shading flat, axis equal |
| 28 |
end |
| 29 |
|
| 30 |
% Get the llc grid information |
| 31 |
disp('Reading the grid information...'); |
| 32 |
fnc_in = 'llc_p90_%d.nc'; |
| 33 |
vnms = { 'XC' 'YC' 'XG' 'YG' }; |
| 34 |
d2r = pi/180.0; |
| 35 |
ginfo = {}; |
| 36 |
for k = 1:5 |
| 37 |
nc = netcdf(sprintf(fnc_in,k),'nowrite'); |
| 38 |
for j = 1:length(vnms) |
| 39 |
eval(sprintf('ginfo(k).%s = nc{''%s''}(:);',vnms{j},vnms{j})); |
| 40 |
end |
| 41 |
nc = close(nc); |
| 42 |
|
| 43 |
% compute 3D coords of the C and G points |
| 44 |
cor = zeros( [ size(ginfo(k).XG) 3 ]); |
| 45 |
[cor(:,:,1),cor(:,:,2),cor(:,:,3)] = sph2cart( ginfo(k).XG*d2r, ... |
| 46 |
ginfo(k).YG*d2r,1 ); |
| 47 |
cen = zeros( [ size(ginfo(k).XC) 3 ]); |
| 48 |
[cen(:,:,1),cen(:,:,2),cen(:,:,3)] = sph2cart( ginfo(k).XC*d2r, ... |
| 49 |
ginfo(k).YC*d2r,1 ); |
| 50 |
ginfo(k).cor = cor; |
| 51 |
ginfo(k).cen = cen; |
| 52 |
|
| 53 |
% empty bathy |
| 54 |
ginfo(k).bathy = zeros(size( size(ginfo(k).XC) )); |
| 55 |
end |
| 56 |
|
| 57 |
% Do a quick-and-dirty regrid |
| 58 |
disp('Performing the regrid...'); |
| 59 |
s_lon = -37; |
| 60 |
s_lat = 0.0; |
| 61 |
for k = 1:5 |
| 62 |
disp(sprintf(' k = %d',k)); |
| 63 |
% |
| 64 |
% / i,j+1 i+1,j+1 \ |
| 65 |
% \ i,j i+i,j / |
| 66 |
for j = 1:size(ginfo(k).XC,2) |
| 67 |
jr = [ j j+1 ]; |
| 68 |
for i = 1:size(ginfo(k).XC,1) |
| 69 |
ir = [ i i+1 ]; |
| 70 |
lon_min = min(min( ginfo(k).XG(ir,jr) + s_lon )); |
| 71 |
lon_max = max(max( ginfo(k).XG(ir,jr) + s_lon )); |
| 72 |
lat_min = min(min( ginfo(k).YG(ir,jr) + s_lat )); |
| 73 |
lat_max = max(max( ginfo(k).YG(ir,jr) + s_lat )); |
| 74 |
% [ lon_min lon_max lat_min lat_max ] |
| 75 |
lon_mm = [ mod(lon_min + 180,360)-180 ... |
| 76 |
mod(lon_max + 180,360)-180 ]; |
| 77 |
lon_min = min(lon_mm); |
| 78 |
lon_max = max(lon_mm); |
| 79 |
|
| 80 |
d_lon = lon_max - lon_min; |
| 81 |
if (abs(d_lon) > 45 && lat_min < 88) |
| 82 |
i_lon = find( lons >= lon_max ... |
| 83 |
| lons <= lon_min ); |
| 84 |
else |
| 85 |
i_lon = find(lon_min <= lons & lons <= lon_max); |
| 86 |
end |
| 87 |
i_lat = find(lat_min <= lats & lats <= lat_max); |
| 88 |
|
| 89 |
% average the bathy |
| 90 |
bv = et2(i_lon,i_lat); |
| 91 |
if length(bv(:)) > 1 |
| 92 |
ginfo(k).bathy(i,j) = mean(bv(:)); |
| 93 |
else |
| 94 |
% If not averaging, then interpolate |
| 95 |
% ginfo(k).bathy(i,j) = NaN; |
| 96 |
i_lon = interp1(lons,[1:length(lons)],lon_min,'nearest'); |
| 97 |
i_lat = interp1(lats,[1:length(lats)],lat_min,'nearest'); |
| 98 |
ginfo(k).bathy(i,j) = et2(i_lon,i_lat); |
| 99 |
end |
| 100 |
end |
| 101 |
end |
| 102 |
end |
| 103 |
|
| 104 |
% Plot the resulting bathymetry |
| 105 |
k = 3; |
| 106 |
for k = 1:5 |
| 107 |
disp(sprintf(' k = %d',k)); |
| 108 |
ginfo(k).b_oce = ginfo(k).bathy; |
| 109 |
% ginfo(k).b_oce(find(ginfo(k).b_oce >= 0.0)) = NaN; |
| 110 |
ginfo(k).b_oce(find(ginfo(k).b_oce >= 0.0)) = 1000; |
| 111 |
if k == 2 |
| 112 |
hold on |
| 113 |
end |
| 114 |
% figure(k) |
| 115 |
surf( ginfo(k).cor(:,:,1), ... |
| 116 |
ginfo(k).cor(:,:,2), ... |
| 117 |
ginfo(k).cor(:,:,3), ginfo(k).b_oce ) |
| 118 |
if k == 5 |
| 119 |
hold off |
| 120 |
end |
| 121 |
end |
| 122 |
axis equal, view(2) |
| 123 |
|
| 124 |
|
| 125 |
% Plot the bathymetry at 1/2 resolution |
| 126 |
k = 3; |
| 127 |
for k = 1:5 |
| 128 |
disp(sprintf(' k = %d',k)); |
| 129 |
ginfo(k).c_half = ginfo(k).cor(1:2:end,1:2:end,:); |
| 130 |
ginfo(k).b_half = ginfo(k).bathy(1:2:end,1:2:end); |
| 131 |
ginfo(k).b_half(find(ginfo(k).b_half >= 0.0)) = 1000; |
| 132 |
if k == 2 |
| 133 |
hold on |
| 134 |
end |
| 135 |
% figure(k) |
| 136 |
surf( ginfo(k).c_half(:,:,1), ... |
| 137 |
ginfo(k).c_half(:,:,2), ... |
| 138 |
ginfo(k).c_half(:,:,3), ginfo(k).b_half ) |
| 139 |
if k == 5 |
| 140 |
hold off |
| 141 |
end |
| 142 |
end |
| 143 |
axis equal, view(2) |
| 144 |
|
| 145 |
%--- BREAK POINT HERE |
| 146 |
%--- do e.g. view(80,45) to change view angle |
| 147 |
|
| 148 |
|
| 149 |
|
| 150 |
if do_print > 0 |
| 151 |
print -depsc llc_bathy.eps |
| 152 |
end |
| 153 |
|
| 154 |
|
| 155 |
% Write the bathymetry to netCDF compatible with MNC |
| 156 |
id = 'bathy'; |
| 157 |
units = 'm'; |
| 158 |
for k = 1:5 |
| 159 |
disp(sprintf(' k = %d',k)); |
| 160 |
ginfo(k).b_out = ginfo(k).bathy; |
| 161 |
ginfo(k).b_out(find(ginfo(k).bathy >= 0.0)) = 0.0; |
| 162 |
bfile = sprintf('llc_p90_bathy.f%03d.nc',k); |
| 163 |
|
| 164 |
nc = netcdf(bfile, 'clobber'); |
| 165 |
nc.reference = 'bathymetry'; |
| 166 |
nc.author = 'Ed Hill <eh3@mit.edu>'; |
| 167 |
nc.date = eval('date'); |
| 168 |
nc('X') = size( ginfo(k).XC, 1 ); |
| 169 |
nc('Y') = size( ginfo(k).XC, 2 ); |
| 170 |
nc{ id } = { 'Y', 'X' }; |
| 171 |
nc{ id }.units = units; |
| 172 |
nc{ id }(:) = ginfo(k).b_out'; |
| 173 |
nc = close(nc); |
| 174 |
end |
| 175 |
|
| 176 |
% Write the bathymetry to a set of 90-by-90 per-tile MDSIO-compatible |
| 177 |
% files |
| 178 |
% face is js |
| 179 |
iti = [ 1 1 1 ; ... |
| 180 |
1 91 1 ; ... |
| 181 |
1 181 1 ; ... |
| 182 |
1 271 1 ; ... |
| 183 |
2 1 1 ; ... |
| 184 |
2 91 1 ; ... |
| 185 |
2 181 1 ; ... |
| 186 |
2 271 1 ; ... |
| 187 |
3 1 1 ; ... |
| 188 |
4 1 1 ; ... |
| 189 |
4 1 91 ; ... |
| 190 |
4 1 181 ; ... |
| 191 |
4 1 271 ; ... |
| 192 |
5 1 1 ; ... |
| 193 |
5 1 91 ; ... |
| 194 |
5 1 181 ; ... |
| 195 |
5 1 271 ]; |
| 196 |
for k = 1:size(iti,1) |
| 197 |
disp(sprintf(' k = %d',k)); |
| 198 |
fname = sprintf('bathy.%03d.001.data',k); |
| 199 |
disp( fname ) |
| 200 |
fid = fopen(fname, 'w', 'ieee-be'); |
| 201 |
is = iti(k,3); ie = is + 90 - 1; |
| 202 |
js = iti(k,2); je = js + 90 - 1; |
| 203 |
tmp = ginfo(iti(k,1)).b_out(is:ie,js:je); |
| 204 |
fwrite(fid,tmp,'real*8',0,'ieee-be'); |
| 205 |
fclose(fid); |
| 206 |
surf(tmp), view(2), axis equal, shading flat, pause(1) |
| 207 |
end |
| 208 |
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