Mercurial > dive4elements > gnv-client

annotate doc/config-manual/generating_maps.tex @ 1134:411b09d348ca

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Some refactoring of 'Adding new Languages' section. doc/trunk@1249 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 30 Jun 2010 08:52:49 +0000
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children
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1 \subsection{Generating Maps-- Background Information and Configuration}
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2
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3 The artifact-server is able to process geographic data and provide them
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4 for a WMS service rendering maps via a HTTP-based interface. The
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5 following process chains are covered. For generating horizontal-cross sections,
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6 the following steps have to be processed:
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7
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8 \begin{enumerate}
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9 %% FIXME: When do we clip? Sequence will influence the interpolation
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10 \item Selecting the data from datawarehouse
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11 \item Clipping the datasets along the passed polygon
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12 \item Calculating interpolation in the plane
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13 \item Generating contour lines
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14 \item Matching processed parameter data to the corresponding style
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15 \item Rendering requested map
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16 \end{enumerate}
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17
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18 For generating maps from object-based datamodels like CONTIS, NAUTHIS
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19 and Marine Features, just the following steps are needed:
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20
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21 \begin{enumerate}
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22 \item Selecting the data from datawarehouse
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23 \item Clipping the datasets along the passed polygon
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24 \item Matching processed object data to the corresponding style
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25 \item Rendering requested map
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26 \end{enumerate}
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27
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28 In order to understand the configuration facilities for generating maps
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29 in more detail, the internal
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30 interaction of the artifact-server and the mapserver is described below
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31 for the use case when a user parameterizes a horizontal-cross-section
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32 profile and visualizes it as a map (without regarding the caching
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33 facilities)
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34
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35 \begin{enumerate}
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36 \item After finishing the parameterization, the artifact-server
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37 requests the data from the database-backend and processes the data
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38 (see above).
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39
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40 \item By requesting a map in the GNV-WebClient, the artifact-server writes
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41 a ESRI shapefile with (clipped) geometries, attribute data, projection
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42 information and a special file storing meta information (\texttt{meta.xml})
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43 for this artifact in the a corresponding directory in the
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44 \texttt{shapefile-directory}.
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45
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46 \item After that the so called \texttt{map-generator} is triggered. The
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47 map-generator searches the \texttt{shape-directory} and its subfolders with
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48 all existing \texttt{meta.xml} files and generates a central configuration
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49 file for the mapserver at \texttt{ map-generator/mapfile@path}. Each
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50 shapefile will be published as a WMS layer. \\
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51 The generated mapfile is constructed out of a base template from \texttt{
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52 map-generator/templates/maptemplate} and a parameter-/layer-specific part
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53 generated from \texttt{map-generator/templates/path}. The selection of the
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54 correct file-based templates is extracted out of the
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55 \texttt{meta.xml}-file.
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56
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57 \item The matching between the generated geograpic data and the
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58 corresponding style files is been done by the artifact-server, constructing
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59 filenames of maptemplates out of parameter-information. For
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60 horizontal-cross-sections the schema looks like this \texttt{
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61 horizontalcrosssection\_\$NAME-OF-PARAMETER}; for layer-orientated FIS like
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62 e.g. NAUTHIS and CONTIS like this \texttt{
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63 layer\_\$ID\_MAPSERVICE\_\$ID\_LAYER} e.g.
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64 \texttt{layer\_BSH\_IMS\_CONTIS\_Resources\_2}.
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65 %% FIXME@TE: Marine Feature? Name of WMS?
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66 In order to set at least title, geometry-type and path to the
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67 corresponding shapefile dynamically a templating language, called
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68 \texttt{velocity} is used.
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69
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70 \item The corresponding subfolder of an artifact in \texttt{
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71 shape-directory} with their shapefiles
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72 and \texttt{meta.xml}-document will be deleted after the time of
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73 expiry. By triggering the \texttt{map-generator} the next time, the
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74 geographic data and the central configuration of the mapserver will
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75 be updated.
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76
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77 \end{enumerate}
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78
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79 The coupling of the artifact-server and mapserver is free of
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80 maintenance. The artifact-server as master cares about deleting and
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81 updating the configuration of the mapserver.
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82
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83 \begin{lstlisting}
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84 artifact-database
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85 |-- gnv # charts, palettes, interpolation parameters
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86 | |-- map-generator
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87 | |-- shapefile-directory
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88 | `-- horizontal-cross-section
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89 |-- mapserver
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90 `-- velocity
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91 \end{lstlisting}
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92
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93 \paragraph*{mapserver}
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94 {\em Function}: URL of the mapserver where request can be send to. The
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95 URL will be used for displaying the location e.g. in the GNV-WebClient and in
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96 the {\tt meta.xml}-file.
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97
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98 \begin{itemize}
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99 \item {\tt server}: URL of the mapserver where request can send to.
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100 \end{itemize}
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101
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102 \paragraph*{velocity}
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103 {\em Function}: Templating language used in the maptemplates at
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104 \texttt{map-generator/templates/path} for accessing the parameters from
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105 dynamically generated \texttt{meta.xml}-configuration of artifacts.
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106
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107 \begin{itemize}
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108 \item {\tt logfile}: Setting the path to write log files. \\
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109 Preconfigured to \texttt{/var/log/artifacts/velocity.log}.
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110 {\bf Just
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111 absolute pathes are allowed here!}
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112 \end{itemize}
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113
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114 \paragraph*{map-generator}
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115 {\em Function}: Mechanism for generating configuration for the {\tt
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116 mapserver} dynamically. For background information about the interaction
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117 between artifact-server and mapserver, see above.
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118
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119 \begin{itemize}
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120 \item {\tt mapfile}: path to the mapfile accessed by the WMS wrapper
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121 {\tt gnv-wms}
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122 \item {\tt templates}: \\ {\tt path} to the directory where
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123 parameter-specific mapconfiguartions (as *.vm) are stored.
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124 \\ {\tt
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125 maptemplate} containing the WMS instance-specific configurations and
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126 metadata, like overall boundingbox, spatial reference systems and
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127 contact data.
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128 \end{itemize}
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129
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130 \paragraph*{shapefile-directory}
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131 {\em Function}: Pointer where shapefiles for map-generation are stored
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132
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133 \begin{itemize}
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134 \item {\tt path}: path to the directory where shapefiles are stored
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135 and accessed by {\tt mapserver}
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136 \end{itemize}
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137
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138 \paragraph*{horizontal-cross-section}
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139 {\em Function}: Parameterization for the interpolation algorithm for
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140 horizontal-cross-sections (maps).
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141
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142
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143 \begin{itemize}
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144 \item {\tt sample}: The attribute {\tt number} sets the number of
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145 steps for the interpolation grid.
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146 \item {\tt ground}: {\tt interpolation} method for calculating the
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147 interpolation from the last measured value in meshes against the seafloor.
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148 Available methods are {\tt nearest-neighbor | bilinear | bicubic}.
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149 \end{itemize}
http://dive4elements.wald.intevation.org