1 | #!/usr/bin/env python |
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2 | # -*- coding: utf-8 -*- |
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3 | #******************************************************************************* |
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4 | # @Author: Anne Fouilloux (University of Oslo) |
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5 | # |
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6 | # @Date: October 2014 |
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7 | # |
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8 | # @Change History: |
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9 | # |
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10 | # November 2015 - Leopold Haimberger (University of Vienna): |
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11 | # - optimized display_info |
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12 | # - optimized data_retrieve and seperate between python and shell |
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13 | # script call |
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14 | # |
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15 | # February 2018 - Anne Philipp (University of Vienna): |
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16 | # - applied PEP8 style guide |
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17 | # - added documentation |
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18 | # - applied some minor modifications in programming style/structure |
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19 | # |
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20 | # @License: |
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21 | # (C) Copyright 2015-2018. |
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22 | # |
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23 | # This software is licensed under the terms of the Apache Licence Version 2.0 |
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24 | # which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. |
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25 | # |
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26 | # @Class Description: |
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27 | # A MARS revtrieval has a specific syntax with a selection of keywords and |
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28 | # their corresponding values. This class provides the necessary functions |
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29 | # by displaying the selected parameters and their values and the actual |
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30 | # retrievement of the data through a mars request or a Python web api |
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31 | # interface. The initialization already expects all the keyword values. |
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32 | # |
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33 | # @Class Content: |
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34 | # - __init__ |
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35 | # - display_info |
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36 | # - data_retrieve |
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37 | # |
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38 | # @Class Attributes: |
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39 | # - server |
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40 | # - marsclass |
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41 | # - dtype |
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42 | # - levtype |
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43 | # - levelist |
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44 | # - repres |
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45 | # - date |
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46 | # - resol |
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47 | # - stream |
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48 | # - area |
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49 | # - time |
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50 | # - step |
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51 | # - expver |
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52 | # - number |
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53 | # - accuracy |
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54 | # - grid |
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55 | # - gaussian |
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56 | # - target |
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57 | # - param |
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58 | # |
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59 | #******************************************************************************* |
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60 | |
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61 | # ------------------------------------------------------------------------------ |
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62 | # MODULES |
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63 | # ------------------------------------------------------------------------------ |
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64 | import subprocess |
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65 | import os |
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66 | |
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67 | import _config |
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68 | # ------------------------------------------------------------------------------ |
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69 | # CLASS |
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70 | # ------------------------------------------------------------------------------ |
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71 | class MarsRetrieval(object): |
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72 | ''' |
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73 | Class for submitting MARS retrievals. |
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74 | |
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75 | A description of MARS keywords/arguments and examples of their |
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76 | values can be found here: |
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77 | https://software.ecmwf.int/wiki/display/UDOC/\ |
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78 | Identification+keywords#Identificationkeywords-class |
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79 | |
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80 | ''' |
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81 | |
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82 | def __init__(self, server, marsclass="ei", type="", levtype="", |
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83 | levelist="", repres="", date="", resol="", stream="", |
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84 | area="", time="", step="", expver="1", number="", |
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85 | accuracy="", grid="", gaussian="", target="", |
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86 | param=""): |
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87 | ''' |
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88 | @Description: |
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89 | Initialises the instance of the MarsRetrieval class and |
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90 | defines and assigns a set of the necessary retrieval parameters |
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91 | for the FLEXPART input data. |
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92 | A description of MARS keywords/arguments, their dependencies |
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93 | on each other and examples of their values can be found here: |
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94 | |
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95 | https://software.ecmwf.int/wiki/display/UDOC/MARS+keywords |
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96 | |
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97 | @Input: |
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98 | self: instance of MarsRetrieval |
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99 | For description see class documentation. |
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100 | |
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101 | server: instance of ECMWFService (from ECMWF Web-API) |
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102 | This is the connection to the ECMWF data servers. |
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103 | It is needed for the pythonic access of ECMWF data. |
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104 | |
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105 | marsclass: string, optional |
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106 | Characterisation of dataset. E.g. EI (ERA-Interim), |
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107 | E4 (ERA40), OD (Operational archive), ea (ERA5). |
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108 | Default is the ERA-Interim dataset "ei". |
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109 | |
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110 | type: string, optional |
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111 | Determines the type of fields to be retrieved. |
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112 | Selects between observations, images or fields. |
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113 | Examples for fields: Analysis (an), Forecast (fc), |
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114 | Perturbed Forecast (pf), Control Forecast (cf) and so on. |
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115 | Default is an empty string. |
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116 | |
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117 | levtype: string, optional |
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118 | Denotes type of level. Has a direct implication on valid |
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119 | levelist values! |
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120 | E.g. model level (ml), pressure level (pl), surface (sfc), |
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121 | potential vorticity (pv), potential temperature (pt) |
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122 | and depth (dp). |
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123 | Default is an empty string. |
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124 | |
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125 | levelist: string, optional |
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126 | Specifies the required levels. It has to have a valid |
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127 | correspondence to the selected levtype. |
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128 | Examples: model level: 1/to/137, pressure levels: 500/to/1000 |
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129 | Default is an empty string. |
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130 | |
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131 | repres: string, optional |
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132 | Selects the representation of the archived data. |
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133 | E.g. sh - spherical harmonics, gg - Gaussian grid, |
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134 | ll - latitude/longitude, ... |
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135 | Default is an empty string. |
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136 | |
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137 | date: string, optional |
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138 | Specifies the Analysis date, the Forecast base date or |
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139 | Observations date. Valid formats are: |
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140 | Absolute as YYYY-MM-DD or YYYYMMDD. |
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141 | Default is an empty string. |
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142 | |
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143 | resol: string, optional |
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144 | Specifies the desired triangular truncation of retrieved data, |
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145 | before carrying out any other selected post-processing. |
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146 | The default is automatic truncation (auto), by which the lowest |
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147 | resolution compatible with the value specified in grid is |
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148 | automatically selected for the retrieval. |
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149 | Users wanting to perform post-processing from full spectral |
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150 | resolution should specify Archived Value (av). |
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151 | The following are examples of existing resolutions found in |
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152 | the archive: 63, 106, 159, 213, 255, 319, 399, 511, 799 or 1279. |
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153 | This keyword has no meaning/effect if the archived data is |
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154 | not in spherical harmonics representation. |
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155 | The best selection can be found here: |
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156 | https://software.ecmwf.int/wiki/display/UDOC/\ |
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157 | Retrieve#Retrieve-Truncationbeforeinterpolation |
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158 | Default is an empty string. |
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159 | |
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160 | stream: string, optional |
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161 | Identifies the forecasting system used to generate the data. |
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162 | E.g. oper (Atmospheric model), enfo (Ensemble forecats), ... |
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163 | Default is an empty string. |
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164 | |
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165 | area: string, optional |
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166 | Specifies the desired sub-area of data to be extracted. |
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167 | Areas can be defined to wrap around the globe. |
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168 | |
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169 | Latitude values must be given as signed numbers, with: |
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170 | north latitudes (i.e. north of the equator) |
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171 | being positive (e.g: 40.5) |
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172 | south latitutes (i.e. south of the equator) |
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173 | being negative (e.g: -50.5) |
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174 | Longtitude values must be given as signed numbers, with: |
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175 | east longitudes (i.e. east of the 0 degree meridian) |
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176 | being positive (e.g: 35.0) |
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177 | west longitudes (i.e. west of the 0 degree meridian) |
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178 | being negative (e.g: -20.5) |
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179 | |
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180 | E.g.: North/West/South/East |
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181 | Default is an empty string. |
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182 | |
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183 | time: string, optional |
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184 | Specifies the time of the data in hours and minutes. |
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185 | Valid values depend on the type of data: Analysis time, |
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186 | Forecast base time or First guess verification time |
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187 | (all usually at synoptic hours: 00, 06, 12 and 18 ). |
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188 | Observation time (any combination in hours and minutes is valid, |
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189 | subject to data availability in the archive). |
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190 | The syntax is HHMM or HH:MM. If MM is omitted it defaults to 00. |
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191 | Default is an empty string. |
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192 | |
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193 | step: string, optional |
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194 | Specifies the forecast time step from forecast base time. |
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195 | Valid values are hours (HH) from forecast base time. It also |
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196 | specifies the length of the forecast which verifies at |
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197 | First Guess time. |
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198 | E.g. 1/3/6-hourly |
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199 | Default is an empty string. |
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200 | |
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201 | expver: string, optional |
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202 | The version of the dataset. Each experiment is assigned a |
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203 | unique code (version). Production data is assigned 1 or 2, |
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204 | and experimental data in Operations 11, 12 ,... |
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205 | Research or Member State's experiments have a four letter |
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206 | experiment identifier. |
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207 | Default is "1". |
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208 | |
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209 | number: string, optional |
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210 | Selects the member in ensemble forecast run. (Only then it |
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211 | is necessary.) It has a different meaning depending on |
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212 | the type of data. |
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213 | E.g. Perturbed Forecasts: specifies the Ensemble forecast member |
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214 | Default is an empty string. |
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215 | |
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216 | accuracy: string, optional |
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217 | Specifies the number of bits per value to be used in the |
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218 | generated GRIB coded fields. |
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219 | A positive integer may be given to specify the preferred number |
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220 | of bits per packed value. This must not be greater than the |
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221 | number of bits normally used for a Fortran integer on the |
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222 | processor handling the request (typically 32 or 64 bit). |
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223 | Within a compute request the accuracy of the original fields |
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224 | can be passed to the result field by specifying accuracy=av. |
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225 | Default is an empty string. |
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226 | |
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227 | grid: string, optional |
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228 | Specifies the output grid which can be either a Gaussian grid |
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229 | or a Latitude/Longitude grid. MARS requests specifying |
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230 | grid=av will return the archived model grid. |
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231 | |
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232 | Lat/Lon grid: The grid spacing needs to be an integer |
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233 | fraction of 90 degrees e.g. grid = 0.5/0.5 |
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234 | |
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235 | Gaussian grid: specified by a letter denoting the type of |
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236 | Gaussian grid followed by an integer (the grid number) |
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237 | representing the number of lines between the Pole and Equator, |
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238 | e.g. |
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239 | grid = F160 - full (or regular) Gaussian grid with |
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240 | 160 latitude lines between the pole and equator |
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241 | grid = N320 - ECMWF original reduced Gaussian grid with |
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242 | 320 latitude lines between the pole and equator, |
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243 | see Reduced Gaussian Grids for grid numbers used at ECMWF |
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244 | grid = O640 - ECMWF octahedral (reduced) Gaussian grid with |
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245 | 640 latitude lines between the pole and equator |
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246 | Default is an empty string. |
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247 | |
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248 | gaussian: string, optional |
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249 | This parameter is deprecated and should no longer be used. |
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250 | Specifies the desired type of Gaussian grid for the output. |
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251 | Valid Gaussian grids are quasi-regular (reduced) or regular. |
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252 | Keyword gaussian can only be specified together with |
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253 | keyword grid. Gaussian without grid has no effect. |
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254 | Default is an empty string. |
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255 | |
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256 | target: string, optional |
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257 | Specifies a file into which data is to be written after |
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258 | retrieval or manipulation. Path names should always be |
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259 | enclosed in double quotes. The MARS client supports automatic |
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260 | generation of multiple target files using MARS keywords |
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261 | enclosed in square brackets [ ]. If the environment variable |
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262 | MARS_MULTITARGET_STRICT_FORMAT is set to 1 before calling mars, |
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263 | the keyword values will be used in the filename as shown by |
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264 | the ecCodes GRIB tool grib_ls -m, e.g. with |
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265 | MARS_MULTITARGET_STRICT_FORMAT set to 1 the keywords time, |
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266 | expver and param will be formatted as 0600, 0001 and 129.128 |
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267 | rather than 600, 1 and 129. |
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268 | Default is an empty string. |
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269 | |
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270 | param: string, optional |
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271 | Specifies the meteorological parameter. |
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272 | The list of meteorological parameters in MARS is extensive. |
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273 | Their availability is directly related to their meteorological |
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274 | meaning and, therefore, the rest of directives specified |
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275 | in the MARS request. |
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276 | Meteorological parameters can be specified by their |
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277 | GRIB code (param=130), their mnemonic (param=t) or |
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278 | full name (param=temperature). |
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279 | The list of parameter should be seperated by a "/"-sign. |
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280 | E.g. 130/131/133 |
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281 | Default is an empty string. |
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282 | |
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283 | @Return: |
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284 | <nothing> |
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285 | ''' |
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286 | |
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287 | self.server = server |
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288 | self.marsclass = marsclass |
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289 | self.type = type |
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290 | self.levtype = levtype |
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291 | self.levelist = levelist |
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292 | self.repres = repres |
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293 | self.date = date |
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294 | self.resol = resol |
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295 | self.stream = stream |
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296 | self.area = area |
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297 | self.time = time |
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298 | self.step = step |
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299 | self.expver = expver |
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300 | self.number = number |
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301 | self.accuracy = accuracy |
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302 | self.grid = grid |
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303 | self.gaussian = gaussian |
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304 | self.target = target |
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305 | self.param = param |
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306 | |
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307 | return |
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308 | |
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309 | |
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310 | def display_info(self): |
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311 | ''' |
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312 | @Description: |
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313 | Prints all class attributes and their values to the |
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314 | standard output. |
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315 | |
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316 | @Input: |
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317 | self: instance of MarsRetrieval |
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318 | For description see class documentation. |
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319 | |
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320 | @Return: |
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321 | <nothing> |
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322 | ''' |
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323 | # Get all class attributes and their values as a dictionary |
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324 | attrs = vars(self) |
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325 | |
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326 | # iterate through all attributes and print them |
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327 | # with their corresponding values |
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328 | for item in attrs.items(): |
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329 | if item[0] in 'server': |
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330 | pass |
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331 | else: |
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332 | print(item[0] + ': ' + str(item[1])) |
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333 | |
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334 | return |
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335 | |
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336 | |
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337 | def print_info(self, inputdir): |
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338 | ''' |
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339 | @Description: |
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340 | Prints all mars requests to an extra file for debugging and |
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341 | information. |
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342 | |
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343 | @Input: |
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344 | self: instance of MarsRetrieval |
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345 | For description see class documentation. |
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346 | |
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347 | inputdir: string |
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348 | The path where all data from the retrievals are stored. |
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349 | |
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350 | @Return: |
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351 | <nothing> |
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352 | ''' |
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353 | # Get all class attributes and their values as a dictionary |
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354 | attrs = vars(self) |
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355 | |
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356 | # open a file to store all requests to |
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357 | with open(os.path.join(inputdir, |
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358 | _config.FILE_MARS_REQUESTS), 'a') as f: |
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359 | f.write('mars\n') |
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360 | # iterate through all attributes and print them |
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361 | # with their corresponding values |
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362 | for item in attrs.items(): |
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363 | if item[0] in 'server': |
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364 | pass |
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365 | else: |
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366 | f.write(item[0] + ': ' + str(item[1]) + '\n') |
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367 | f.write('\n\n') |
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368 | |
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369 | return |
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370 | |
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371 | def data_retrieve(self): |
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372 | ''' |
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373 | @Description: |
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374 | Submits a MARS retrieval. Depending on the existence of |
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375 | ECMWF Web-API it is submitted via Python or a |
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376 | subprocess in the Shell. The parameter for the mars retrieval |
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377 | are taken from the defined class attributes. |
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378 | |
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379 | @Input: |
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380 | self: instance of MarsRetrieval |
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381 | For description see class documentation. |
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382 | |
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383 | @Return: |
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384 | <nothing> |
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385 | ''' |
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386 | # Get all class attributes and their values as a dictionary |
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387 | attrs = vars(self) |
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388 | |
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389 | # convert the dictionary of attributes into a comma |
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390 | # seperated list of attributes with their values |
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391 | # needed for the retrieval call |
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392 | s = 'ret' |
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393 | for k, v in attrs.iteritems(): |
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394 | if k in 'server': |
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395 | continue |
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396 | if k == 'marsclass': |
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397 | k = 'class' |
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398 | if v == '': |
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399 | continue |
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400 | if k.lower() == 'target': |
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401 | target = v |
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402 | else: |
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403 | s = s + ',' + k + '=' + str(v) |
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404 | |
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405 | # MARS request via Python script |
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406 | if self.server is not False: |
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407 | try: |
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408 | self.server.execute(s, target) |
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409 | except: |
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410 | print('MARS Request failed, \ |
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411 | have you already registered at apps.ecmwf.int?') |
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412 | raise IOError |
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413 | if os.stat(target).st_size == 0: |
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414 | print('MARS Request returned no data - please check request') |
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415 | raise IOError |
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416 | # MARS request via extra process in shell |
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417 | else: |
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418 | s += ',target = "' + target + '"' |
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419 | p = subprocess.Popen(['mars'], stdin=subprocess.PIPE, |
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420 | stdout=subprocess.PIPE, |
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421 | stderr=subprocess.PIPE, bufsize=1) |
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422 | pout = p.communicate(input=s)[0] |
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423 | print(pout.decode()) |
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424 | |
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425 | if 'Some errors reported' in pout.decode(): |
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426 | print('MARS Request failed - please check request') |
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427 | raise IOError |
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428 | |
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429 | if os.stat(target).st_size == 0: |
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430 | print('MARS Request returned no data - please check request') |
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431 | raise IOError |
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432 | |
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433 | return |
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