1 | %'read_civxdata': reads civx data from netcdf files
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2 | %------------------------------------------------------------------
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3 | %
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4 | % function [Field,VelTypeOut]=read_civxdata(filename,FieldNames,VelType)
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5 | %
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6 | % OUTPUT:
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7 | % Field: structure representing the selected field, containing
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8 | % .Txt: (char string) error message if any
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9 | % .ListGlobalAttribute: list of global attributes containing:
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10 | % .NbCoord: number of vector components
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11 | % .NbDim: number of dimensions (=2 or 3)
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12 | % .dt: time interval for the corresponding image pair
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13 | % .Time: absolute time (average of the initial image pair)
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14 | % .CivStage: =0,
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15 | % =1, civ1 has been performed only
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16 | % =2, fix1 has been performed
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17 | % =3, pacth1 has been performed
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18 | % =4, civ2 has been performed
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19 | % =5, fix2 has been performed
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20 | % =6, pacth2 has been performed
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21 | % .CoordUnit: 'pixel'
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22 | % .ListVarName: {'X' 'Y' 'U' 'V' 'F' 'FF'}
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23 | % .X, .Y, .Z: set of vector coordinates
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24 | % .U,.V,.W: corresponding set of vector components
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25 | % .F: warning flags
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26 | % .FF: error flag, =0 for good vectors
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27 | % .C: scalar associated with velocity (used for vector colors)
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28 | % .DijU; matrix of spatial derivatives (DijU(1,1,:)=DUDX,
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29 | % DijU(1,2,:)=DUDY, Dij(2,1,:)=DVDX, DijU(2,2,:)=DVDY
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30 | %
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31 | % VelTypeOut: velocity type corresponding to the selected field: ='civ1','interp1','interp2','civ2'....
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32 | %
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33 | % INPUT:
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34 | % filename: file name (string).
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35 | % FieldNames =cell of field names to get, which can contain the strings:
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36 | % 'ima_cor': image correlation, vec_c or vec2_C
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37 | % 'vort','div','strain': requires velocity derivatives DUDX...
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38 | % 'error': error estimate (vec_E or vec2_E)
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39 | %
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40 | % VelType : character string indicating the types of velocity fields to read ('civ1','civ2'...)
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41 | % if vel_type=[] or'*', a priority choice, given by vel_type_out{1,2}, is done depending
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42 | % if vel_type='filter'; a structured field is sought (filter2 in priority, then filter1)
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43 |
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44 |
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45 | % FUNCTIONS called:
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46 | % 'varcivx_generator':, sets the names of vaiables to read in the netcdf file
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47 | % 'nc2struct': reads a netcdf file
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48 |
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49 | function [Field,VelTypeOut]=read_civxdata(filename,FieldNames,VelType)
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50 | %% default input
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51 | if ~exist('VelType','var')
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52 | VelType=[];
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53 | end
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54 | if isequal(VelType,'*')
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55 | VelType=[];
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56 | end
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57 | if ~exist('FieldNames','var')
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58 | FieldNames=[]; %default
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59 | end
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60 |
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61 | %% reading data
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62 | VelTypeOut=VelType;%default
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63 | [var,role,units,vel_type_out_cell]=varcivx_generator(FieldNames,VelType);%determine the names of constants and variables to read
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64 | [Field,vardetect,ichoice]=nc2struct(filename,var);%read the variables in the netcdf file
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65 | if isfield(Field,'Txt')
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66 | return
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67 | end
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68 | if vardetect(1)==0
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69 | Field.Txt=[ 'requested field not available in ' filename '/' VelType];
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70 | return
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71 | end
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72 | var_ind=find(vardetect);
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73 | for ivar=1:length(var_ind)
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74 | Field.VarAttribute{ivar}.Role=role{var_ind(ivar)};
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75 | Field.VarAttribute{ivar}.Mesh=0.1;%typical mesh for histograms O.1 pixel
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76 | end
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77 | VelTypeOut=VelType;
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78 | if ~isempty(ichoice)
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79 | VelTypeOut=vel_type_out_cell{ichoice};
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80 | end
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81 |
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82 | %% adjust for Djui:
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83 | if isfield(Field,'DjUi')
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84 | Field.ListVarName(end-2:end)=[];
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85 | Field.ListVarName{end}='DjUi';
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86 | Field.VarDimName(end-2:end)=[];
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87 | Field.VarAttribute(end-2:end)=[];
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88 | end
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89 |
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90 | %% renaming for standard conventions
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91 | Field.NbCoord=Field.nb_coord;
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92 | Field.NbDim=Field.nb_dim;
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93 |
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94 | %% CivStage
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95 | if isfield(Field,'patch2')&& isequal(Field.patch2,1)
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96 | Field.CivStage=6;
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97 | elseif isfield(Field,'fix2')&& isequal(Field.fix2,1)
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98 | Field.CivStage=5;
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99 | elseif isfield(Field,'civ2')&& isequal(Field.civ2,1)
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100 | Field.CivStage=4;
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101 | elseif isfield(Field,'patch')&& isequal(Field.patch,1)
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102 | Field.CivStage=3;
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103 | elseif isfield(Field,'fix')&& isequal(Field.fix,1)
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104 | Field.CivStage=2;
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105 | else
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106 | Field.CivStage=1;
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107 | end
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108 |
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109 | %determine the appropriate constant for time and dt for the PIV pair
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110 | test_civ1=isequal(VelTypeOut,'civ1')||isequal(VelTypeOut,'interp1')||isequal(VelTypeOut,'filter1');
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111 | test_civ2=isequal(VelTypeOut,'civ2')||isequal(VelTypeOut,'interp2')||isequal(VelTypeOut,'filter2');
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112 | Field.Time=0; %default
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113 | Field.TimeUnit='s';
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114 | if test_civ1
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115 | if isfield(Field,'absolut_time_T0')
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116 | Field.Time=double(Field.absolut_time_T0);
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117 | Field.dt=double(Field.dt);
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118 | else
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119 | Field.Txt='the input file is not civx';
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120 | Field.CivStage=0;
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121 | Field.dt=0;
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122 | end
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123 | elseif test_civ2
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124 | Field.Time=double(Field.absolut_time_T0_2);
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125 | Field.dt=double(Field.dt2);
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126 | else
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127 | Field.Txt='the input file is not civx';
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128 | Field.CivStage=0;
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129 | Field.dt=0;
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130 | end
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131 |
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132 |
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133 |
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134 | %% rescale fields to pixel coordinates
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135 | if isfield(Field,'pixcmx')
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136 | Field.pixcmx=double(Field.pixcmx);
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137 | Field.pixcmy=double(Field.pixcmy);
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138 | Field.U=Field.U*Field.pixcmx;
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139 | Field.V=Field.V*Field.pixcmy;
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140 | Field.X=Field.X*Field.pixcmx;
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141 | Field.Y=Field.Y*Field.pixcmy;
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142 | end
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143 | if ~isequal(Field.dt,0)
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144 | Field.U=Field.U*Field.dt;%translate in px displacement
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145 | Field.V=Field.V*Field.dt;
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146 | if isfield(Field,'DjUi')
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147 | Field.DjUi(:,1,1)=Field.dt*Field.DjUi(:,1,1);
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148 | Field.DjUi(:,2,2)=Field.dt*Field.DjUi(:,2,2);
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149 | Field.DjUi(:,1,2)=(Field.pixcmy/Field.pixcmx)*Field.dt*Field.DjUi(:,1,2);
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150 | Field.DjUi(:,2,1)=(Field.pixcmx/Field.pixcmy)*Field.dt*Field.DjUi(:,2,1);
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151 | end
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152 | end
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153 |
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154 | %% update list of global attributes
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155 | List=Field.ListGlobalAttribute;
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156 | ind_remove=[];
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157 | for ilist=1:length(List)
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158 | switch(List{ilist})
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159 | case {'patch2','fix2','civ2','patch','fix','dt2','absolut_time_T0','absolut_time_T0_2','nb_coord','nb_dim','pixcmx','pixcmy'}
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160 | ind_remove=[ind_remove ilist];
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161 | Field=rmfield(Field,List{ilist});
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162 | end
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163 | end
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164 | List(ind_remove)=[];
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165 | Field.ListGlobalAttribute=[{'NbCoord'},{'NbDim'} List {'Time','TimeUnit','CivStage','CoordUnit'}];
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166 | Field.CoordUnit='pixel';
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167 |
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168 |
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169 | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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170 | % [var,role,units,vel_type_out]=varcivx_generator(FieldNames,vel_type)
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171 | %INPUT:
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172 | % FieldNames =cell of field names to get, which can contain the strings:
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173 | % 'ima_cor': image correlation, vec_c or vec2_C
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174 | % 'vort','div','strain': requires velocity derivatives DUDX...
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175 | % 'error': error estimate (vec_E or vec2_E)
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176 | %
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177 | % vel_type: character string indicating the types of velocity fields to read ('civ1','civ2'...)
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178 | % if vel_type=[] or'*', a priority choice, given by vel_type_out{1,2}, is done depending
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179 | % if vel_type='filter'; a structured field is sought (filter2 in priority, then filter1)
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180 |
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181 | function [var,role,units,vel_type_out]=varcivx_generator(FieldNames,vel_type)
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182 |
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183 | %% default input values
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184 | if ~exist('vel_type','var'),vel_type=[];end;
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185 | if iscell(vel_type),vel_type=vel_type{1}; end;%transform cell to string if needed
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186 | if ~exist('FieldNames','var'),FieldNames={'ima_cor'};end;%default scalar
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187 | if ischar(FieldNames), FieldNames={FieldNames}; end;
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188 |
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189 | %% select the priority order for automatic vel_type selection
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190 | testder=0;
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191 | for ilist=1:length(FieldNames)
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192 | if ~isempty(FieldNames{ilist})
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193 | switch FieldNames{ilist}
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194 | case {'vort','div','strain'}
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195 | testder=1;
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196 | end
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197 | end
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198 | end
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199 | if isempty(vel_type) || isequal(vel_type,'*') %undefined velocity type (civ1,civ2...)
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200 | if testder
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201 | vel_type_out{1}='filter2'; %priority to filter2 for scalar reading, filter1 as second
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202 | vel_type_out{2}='filter1';
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203 | else
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204 | vel_type_out{1}='civ2'; %priority to civ2 for vector reading, civ1 as second priority
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205 | vel_type_out{2}='civ1';
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206 | end
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207 | elseif isequal(vel_type,'filter')
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208 | vel_type_out{1}='filter2'; %priority to filter2 for scalar reading, filter1 as second
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209 | vel_type_out{2}='filter1';
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210 | if ~testder
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211 | vel_type_out{3}='civ1';%civ1 as third priority if derivatives are not needed
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212 | end
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213 | elseif testder
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214 | test_civ1=isequal(vel_type,'civ1')||isequal(vel_type,'interp1')||isequal(vel_type,'filter1');
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215 | if test_civ1
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216 | vel_type_out{1}='filter1'; %switch to filter for reading spatial derivatives
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217 | else
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218 | vel_type_out{1}='filter2';
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219 | end
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220 | else
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221 | vel_type_out{1}=vel_type;%imposed velocity field
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222 | end
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223 | vel_type_out=vel_type_out';
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224 |
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225 | %% determine names of netcdf variables to read
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226 | var={'X','Y','Z','U','V','W','C','F','FF'};
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227 | role={'coord_x','coord_y','coord_z','vector_x','vector_y','vector_z','ancillary','warnflag','errorflag'};
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228 | units={'pixel','pixel','pixel','pixel','pixel','pixel',[],[],[]};
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229 | if testder
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230 | var=[var {'DjUi(:,1,1)','DjUi(:,1,2)','DjUi(:,2,1)','DjUi(:,2,2)'}];
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231 | role=[role {'tensor','tensor','tensor','tensor'}];
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232 | units=[units {'pixel','pixel','pixel','pixel'}];
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233 | end
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234 | for ilist=1:length(vel_type_out)
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235 | var=[var;varname1(vel_type_out{ilist},FieldNames)];
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236 | end
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237 |
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238 | %------------------------------------------------------------------------
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239 | %--- determine var names to read
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240 | function varin=varname1(vel_type,FieldNames)
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241 | %------------------------------------------------------------------------
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242 | testder=0;
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243 | C1='';
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244 | C2='';
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245 | for ilist=1:length(FieldNames)
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246 | if ~isempty(FieldNames{ilist})
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247 | switch FieldNames{ilist}
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248 | case 'ima_cor' %image correlation corresponding to a vel vector
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249 | C1='vec_C';
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250 | C2='vec2_C';
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251 | case 'error'
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252 | C1='vec_E';
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253 | C2='vec2_E';
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254 | case {'vort','div','strain'}
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255 | testder=1;
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256 | end
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257 | end
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258 | end
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259 | switch vel_type
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260 | case 'civ1'
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261 | varin={'vec_X','vec_Y','vec_Z','vec_U','vec_V','vec_W',C1,'vec_F','vec_FixFlag'};
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262 | case 'interp1'
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263 | varin={'vec_patch_X','vec_patch_Y','','vec_patch0_U','vec_patch0_V','','','',''};
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264 | case 'filter1'
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265 | varin={'vec_patch_X','vec_patch_Y','','vec_patch_U','vec_patch_V','','','',''};
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266 | case 'civ2'
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267 | varin={'vec2_X','vec2_Y','vec2_Z','vec2_U','vec2_V','vec2_W',C2,'vec2_F','vec2_FixFlag'};
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268 | case 'interp2'
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269 | varin={'vec2_patch_X','vec2_patch_Y','vec2_patch_Z','vec2_patch0_U','vec2_patch0_V','vec2_patch0_W','','',''};
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270 | case 'filter2'
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271 | varin={'vec2_patch_X','vec2_patch_Y','vec2_patch_Z','vec2_patch_U','vec2_patch_V','vec2_patch0_W','','',''};
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272 | end
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273 | if testder
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274 | switch vel_type
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275 | case 'filter1'
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276 | varin=[varin {'vec_patch_DUDX','vec_patch_DVDX','vec_patch_DUDY','vec_patch_DVDY'}];
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277 | case 'filter2'
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278 | varin=[varin {'vec2_patch_DUDX','vec2_patch_DVDX','vec2_patch_DUDY','vec2_patch_DVDY'}];
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279 | end
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280 | end |
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