| 1 |
gforget |
1.1 |
function []=example_faces2latlon2faces(choiceGrid); |
| 2 |
|
|
%object: interpolate back and forth between gcmfaces and lat-lon grid |
| 3 |
|
|
|
| 4 |
|
|
if 0; |
| 5 |
|
|
clear all; grid_load('./',6,'cube'); gcmfaces_bindata; gcmfaces_global; |
| 6 |
|
|
lon=[-179:2:179]; lat=[-30:2:30]; |
| 7 |
|
|
[lat,lon] = meshgrid(lat,lon); |
| 8 |
|
|
fld=sin(2*pi/180*mygrid.XC).*sin(2*pi/180*mygrid.YC); |
| 9 |
|
|
fld2=gcmfaces_interp_2d(fld,lon,lat);%go from gcmfaces grid to lat-lon grid |
| 10 |
|
|
end; |
| 11 |
|
|
|
| 12 |
|
|
gcmfaces_global; global mytri; |
| 13 |
|
|
|
| 14 |
|
|
if myenv.verbose>0; |
| 15 |
|
|
gcmfaces_msg('==============================================='); |
| 16 |
|
|
gcmfaces_msg(['*** entering example_faces2latlon2faces that will ' ... |
| 17 |
|
|
'interpolate a field on the chosen to a lat-lon grid and back' ... |
| 18 |
|
|
'to the original grid'],''); |
| 19 |
|
|
end; |
| 20 |
|
|
|
| 21 |
|
|
%%%%%%%%%%%%%%%%% |
| 22 |
|
|
%load parameters: |
| 23 |
|
|
%%%%%%%%%%%%%%%%% |
| 24 |
|
|
|
| 25 |
|
|
dir0=[myenv.gcmfaces_dir '/sample_input/']; |
| 26 |
|
|
dirGrid=[dir0 '/GRID' choiceGrid '/']; |
| 27 |
|
|
dirIn=[dir0 '/SAMPLE' choiceGrid '/']; |
| 28 |
|
|
if strcmp(choiceGrid,'v4'); |
| 29 |
|
|
nF=5; fileFormat='compact'; |
| 30 |
|
|
elseif strcmp(choiceGrid,'v3'); |
| 31 |
|
|
nF=1; fileFormat='straight'; |
| 32 |
|
|
elseif strcmp(choiceGrid,'cube'); |
| 33 |
|
|
nF=6; fileFormat='cube'; |
| 34 |
|
|
else; |
| 35 |
|
|
error('unknow grid'); |
| 36 |
|
|
end; |
| 37 |
|
|
grid_load(dirGrid,nF,fileFormat); |
| 38 |
|
|
|
| 39 |
|
|
%store reference grid |
| 40 |
|
|
mygrid_refgrid=mygrid; |
| 41 |
|
|
|
| 42 |
|
|
%%%%%%%%%%%%%%%%%%% |
| 43 |
|
|
%field for testing: |
| 44 |
|
|
%%%%%%%%%%%%%%%%%%% |
| 45 |
|
|
|
| 46 |
|
|
if myenv.verbose>0; |
| 47 |
|
|
gcmfaces_msg('* define a sinusoidal field for testing'); |
| 48 |
|
|
end; |
| 49 |
|
|
fld=sin(2*pi/180*mygrid.XC).*sin(2*pi/180*mygrid.YC); |
| 50 |
|
|
|
| 51 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 52 |
|
|
%lat-lon grid for testing: |
| 53 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 54 |
|
|
|
| 55 |
|
|
if myenv.verbose>0; |
| 56 |
|
|
gcmfaces_msg('* define 2x2 lat-lon grid for testing'); |
| 57 |
|
|
end; |
| 58 |
|
|
%define lat-lon grid |
| 59 |
|
|
lon=[-179:2:179]; lat=[-89:2:89]; aa=[-180 180 -90 90]; |
| 60 |
|
|
if max(mygrid_refgrid.XC)>180; |
| 61 |
|
|
lon=[1:2:359]; aa=[0 360 -90 90]; |
| 62 |
|
|
end; |
| 63 |
|
|
% lon=[-179:2:179]; lat=[-30:2:30]; |
| 64 |
|
|
[lat,lon] = meshgrid(lat,lon); |
| 65 |
|
|
%prepare mygrid for lat-lon with no mask |
| 66 |
|
|
mygrid_latlon.nFaces=1; |
| 67 |
|
|
mygrid_latlon.XC=gcmfaces({lon}); mygrid_latlon.YC=gcmfaces({lat}); |
| 68 |
|
|
|
| 69 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 70 |
|
|
%interpolate to lat-lon grid: |
| 71 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 72 |
|
|
|
| 73 |
|
|
if myenv.verbose>0; |
| 74 |
|
|
gcmfaces_msg('* interpolate test field to lat-lon grid'); |
| 75 |
|
|
end; |
| 76 |
|
|
mygrid=mygrid_latlon; gcmfaces_bindata; |
| 77 |
|
|
veclon=convert2array(mygrid.XC); veclon=veclon(mytri.kk); |
| 78 |
|
|
veclat=convert2array(mygrid.YC); veclat=veclat(mytri.kk); |
| 79 |
|
|
|
| 80 |
|
|
mygrid=mygrid_refgrid; gcmfaces_bindata; |
| 81 |
|
|
vecfld=gcmfaces_interp_2d(fld,veclon,veclat);%go from gcmfaces grid to lat-lon grid |
| 82 |
|
|
|
| 83 |
|
|
mygrid=mygrid_latlon; gcmfaces_bindata; |
| 84 |
|
|
fld_latlon=NaN*convert2array(mygrid.XC); |
| 85 |
|
|
fld_latlon(mytri.kk)=vecfld; |
| 86 |
|
|
fld_latlon=convert2array(fld_latlon); |
| 87 |
|
|
|
| 88 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 89 |
|
|
%interpolate back to ref grid: |
| 90 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 91 |
|
|
|
| 92 |
|
|
if myenv.verbose>0; |
| 93 |
|
|
gcmfaces_msg('* interpolate back to original grid'); |
| 94 |
|
|
end; |
| 95 |
|
|
mygrid=mygrid_refgrid; gcmfaces_bindata; |
| 96 |
|
|
veclon=convert2array(mygrid.XC); veclon=veclon(mytri.kk); |
| 97 |
|
|
veclat=convert2array(mygrid.YC); veclat=veclat(mytri.kk); |
| 98 |
|
|
|
| 99 |
|
|
mygrid=mygrid_latlon; gcmfaces_bindata; |
| 100 |
|
|
vecfld=gcmfaces_interp_2d(fld_latlon,veclon,veclat);%go from gcmfaces grid to lat-lon grid |
| 101 |
|
|
|
| 102 |
|
|
mygrid=mygrid_refgrid; gcmfaces_bindata; |
| 103 |
|
|
fld_refgrid=NaN*convert2array(mygrid.XC); |
| 104 |
|
|
fld_refgrid(mytri.kk)=vecfld; |
| 105 |
|
|
fld_refgrid=convert2array(fld_refgrid); |
| 106 |
|
|
|
| 107 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 108 |
|
|
%get and plot the lat-lon array: |
| 109 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 110 |
|
|
|
| 111 |
|
|
if myenv.verbose>0; |
| 112 |
|
|
gcmfaces_msg('* plot lat-lon grid interpolated field'); |
| 113 |
|
|
end; |
| 114 |
|
|
FLD=fld_latlon{1}; |
| 115 |
|
|
figure; pcolor(lon,lat,FLD); colorbar; |
| 116 |
|
|
axis(aa); title('interpoate lat-lon map'); |
| 117 |
|
|
|
| 118 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 119 |
|
|
%plot difference due to interpolation |
| 120 |
|
|
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 121 |
|
|
|
| 122 |
|
|
if myenv.verbose>0; |
| 123 |
|
|
gcmfaces_msg('* plot error due to back and forth interpolation'); |
| 124 |
|
|
end; |
| 125 |
|
|
mygrid=mygrid_refgrid; |
| 126 |
|
|
figure; |
| 127 |
|
|
m_map_gcmfaces(fld_refgrid-fld); colorbar; |
| 128 |
|
|
title('error due to back and forth interpolation'); |
| 129 |
|
|
|
| 130 |
|
|
|
| 131 |
|
|
if myenv.verbose>0; |
| 132 |
|
|
gcmfaces_msg('*** leaving example_faces2latlon2faces'); |
| 133 |
|
|
gcmfaces_msg('==============================================='); |
| 134 |
|
|
end; |
Parent Directory
| 
Revision Log
| 
Revision Graph