netcdf-cxx4/pres__temp__4D__rd_8cpp_source.html
2016-11-11 15:38:10 -07:00

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<div class="title">pres_temp_4D_rd.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/* This is part of the netCDF package.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> Copyright 2006 University Corporation for Atmospheric Research/Unidata.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> See COPYRIGHT file for conditions of use.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> This is an example which reads some 4D pressure and temperature</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> values. The data file read by this program is produced by the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> companion program pres_temp_4D_wr.cpp. It is intended to illustrate</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> the use of the netCDF C++ API.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> This program is part of the netCDF tutorial:</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-tutorial</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> Full documentation of the netCDF C++ API can be found at:</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-cxx</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> $Id: pres_temp_4D_rd.cpp,v 1.5 2010/02/11 22:36:42 russ Exp $</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#include &lt;netcdf&gt;</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="keyword">using namespace </span><a class="code" href="namespacenetCDF.html">netCDF</a>;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">using namespace </span><a class="code" href="namespacenetCDF_1_1exceptions.html">netCDF::exceptions</a>;</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">// We are writing 4D data, a 2 x 6 x 12 lvl-lat-lon grid, with 2</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment">// timesteps of data.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> NLVL = 2;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> NLAT = 6;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> NLON = 12;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> NREC = 2;</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment">// These are used to construct some example data. </span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> SAMPLE_PRESSURE = 900.0;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> SAMPLE_TEMP = 9.0;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> START_LAT = 25.0;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> START_LON = -125.0; </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="comment">// Return this code to the OS in case of failure.</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> NC_ERR = 2;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="keywordtype">int</span> main()</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;{</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">// These arrays will store the latitude and longitude values.</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keywordtype">float</span> lats[NLAT], lons[NLON];</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="comment">// These arrays will hold the data we will read in. We will only</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="comment">// need enough space to hold one timestep of data; one record.</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordtype">float</span> pres_in[NLVL][NLAT][NLON];</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordtype">float</span> temp_in[NLVL][NLAT][NLON];</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">try</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; {</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="comment">// Open the file.</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <a class="code" href="classnetCDF_1_1NcFile.html">NcFile</a> dataFile(<span class="stringliteral">&quot;pres_temp_4D.nc&quot;</span>, NcFile::read);</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="comment">// Get the latitude and longitude variables and read data.</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <a class="code" href="classnetCDF_1_1NcVar.html">NcVar</a> latVar, lonVar;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; latVar = dataFile.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(<span class="stringliteral">&quot;latitude&quot;</span>);</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">if</span>(latVar.<a class="code" href="classnetCDF_1_1NcVar.html#abff3856710bf8ea8ddc4a01b52a61c88">isNull</a>()) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; lonVar = dataFile.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(<span class="stringliteral">&quot;longitude&quot;</span>);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordflow">if</span>(lonVar.<a class="code" href="classnetCDF_1_1NcVar.html#abff3856710bf8ea8ddc4a01b52a61c88">isNull</a>()) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; lonVar.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(lons);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; latVar.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(lats);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="comment">// Check the coordinate variable data. </span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> lat = 0; lat &lt; NLAT; lat++)</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">if</span> (lats[lat] != START_LAT + 5. * lat)</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> lon = 0; lon &lt; NLON; lon++)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keywordflow">if</span> (lons[lon] != START_LON + 5. * lon)</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="comment">// Get the pressure and temperature variables and read data one time step at a time</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <a class="code" href="classnetCDF_1_1NcVar.html">NcVar</a> presVar, tempVar;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; presVar = dataFile.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(<span class="stringliteral">&quot;pressure&quot;</span>);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordflow">if</span>(presVar.<a class="code" href="classnetCDF_1_1NcVar.html#abff3856710bf8ea8ddc4a01b52a61c88">isNull</a>()) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; tempVar = dataFile.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(<span class="stringliteral">&quot;temperature&quot;</span>);</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">if</span>(tempVar.<a class="code" href="classnetCDF_1_1NcVar.html#abff3856710bf8ea8ddc4a01b52a61c88">isNull</a>()) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; vector&lt;size_t&gt; startp,countp;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; startp.push_back(0);</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; startp.push_back(0);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; startp.push_back(0);</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; startp.push_back(0);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; countp.push_back(1);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; countp.push_back(NLVL);</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; countp.push_back(NLAT);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; countp.push_back(NLON);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> rec = 0; rec &lt; NREC; rec++)</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; {</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="comment">// Read the data one record at a time.</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; startp[0]=rec;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; presVar.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(startp,countp,pres_in);</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; tempVar.<a class="code" href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">getVar</a>(startp,countp,temp_in);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keywordtype">int</span> i=0; <span class="comment">//used in the data generation loop</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> lvl = 0; lvl &lt; NLVL; lvl++)</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> lat = 0; lat &lt; NLAT; lat++)</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> lon = 0; lon &lt; NLON; lon++)</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; {</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">if</span>(pres_in[lvl][lat][lon] != (<span class="keywordtype">float</span>) (SAMPLE_PRESSURE + i)) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keywordflow">if</span>(temp_in[lvl][lat][lon] != (<span class="keywordtype">float</span>)(SAMPLE_TEMP + i++)) <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; }</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; } <span class="comment">// next record </span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="comment">// The file is automatically closed by the destructor. This frees</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="comment">// up any internal netCDF resources associated with the file, and</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="comment">// flushes any buffers.</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="comment">// cout &lt;&lt; &quot;*** SUCCESS reading example file pres_temp_4D.nc!&quot; &lt;&lt; endl;</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; }</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="keywordflow">catch</span>(<a class="code" href="classnetCDF_1_1exceptions_1_1NcException.html">NcException</a>&amp; e)</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; e.what();</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; cout&lt;&lt;<span class="stringliteral">&quot;FAILURE**************************&quot;</span>&lt;&lt;endl;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="keywordflow">return</span> NC_ERR;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; }</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;}</div><div class="ttc" id="namespacenetCDF_html"><div class="ttname"><a href="namespacenetCDF.html">netCDF</a></div><div class="ttdoc">C++ API for netCDF4. </div><div class="ttdef"><b>Definition:</b> <a href="ncAtt_8h_source.html#l00009">ncAtt.h:9</a></div></div>
<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="namespacestd.html">std</a></div></div>
<div class="ttc" id="namespacenetCDF_1_1exceptions_html"><div class="ttname"><a href="namespacenetCDF_1_1exceptions.html">netCDF::exceptions</a></div><div class="ttdoc">Exception classes. </div><div class="ttdef"><b>Definition:</b> <a href="ncException_8h_source.html#l00015">ncException.h:15</a></div></div>
<div class="ttc" id="classnetCDF_1_1NcVar_html_abff3856710bf8ea8ddc4a01b52a61c88"><div class="ttname"><a href="classnetCDF_1_1NcVar.html#abff3856710bf8ea8ddc4a01b52a61c88">netCDF::NcVar::isNull</a></div><div class="ttdeci">bool isNull() const </div><div class="ttdoc">Returns true if this object variable is not defined. </div><div class="ttdef"><b>Definition:</b> <a href="ncVar_8h_source.html#l00112">ncVar.h:112</a></div></div>
<div class="ttc" id="classnetCDF_1_1NcVar_html_acfb10fba7aa386e06551039bddd555c3"><div class="ttname"><a href="classnetCDF_1_1NcVar.html#acfb10fba7aa386e06551039bddd555c3">netCDF::NcVar::getVar</a></div><div class="ttdeci">void getVar(void *dataValues) const </div><div class="ttdoc">This is an overloaded member function, provided for convenience. </div><div class="ttdef"><b>Definition:</b> <a href="ncVar_8cpp_source.html#l01439">ncVar.cpp:1439</a></div></div>
<div class="ttc" id="classnetCDF_1_1exceptions_1_1NcException_html"><div class="ttname"><a href="classnetCDF_1_1exceptions_1_1NcException.html">netCDF::exceptions::NcException</a></div><div class="ttdoc">Base object is thrown if a netCDF exception is encountered. </div><div class="ttdef"><b>Definition:</b> <a href="ncException_8h_source.html#l00024">ncException.h:24</a></div></div>
<div class="ttc" id="classnetCDF_1_1NcVar_html"><div class="ttname"><a href="classnetCDF_1_1NcVar.html">netCDF::NcVar</a></div><div class="ttdoc">Class represents a netCDF variable. </div><div class="ttdef"><b>Definition:</b> <a href="ncVar_8h_source.html#l00033">ncVar.h:33</a></div></div>
<div class="ttc" id="classnetCDF_1_1NcFile_html"><div class="ttname"><a href="classnetCDF_1_1NcFile.html">netCDF::NcFile</a></div><div class="ttdoc">Class represents a netCDF root group. </div><div class="ttdef"><b>Definition:</b> <a href="ncFile_8h_source.html#l00018">ncFile.h:18</a></div></div>
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