Mercurial > dive4elements > gnv-client

annotate doc/config-manual/generating_maps.tex @ 946:dd6102eae823

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Added content for generating maps doc/trunk@1090 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Hans Plum <hans.plum@intevation.de>
date Mon, 10 May 2010 21:47:24 +0000
parents 2d84fc30ab58
children 9a28846dfb9c
rev   line source
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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 %% FIXME: box it
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29 In order to understand the configuration facilities for generating maps
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30 in more detail, the internal
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31 interaction of the artifact-server and the mapserver is described below
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32 for the use case when a user parameterizes a horizontal-cross-section
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33 profile and visualizes it as a map (without regarding the caching
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34 facilities)
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35
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36 \begin{enumerate}
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37 \item After finishing the parameterization, the artifact-server
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38 requests the data from the database-backend and processes the data
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39 (see above).
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40
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41 \item By requesting a map in the GNV-WebClient, the artifact-server writes a ESRI
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42 shapefile with (clipped) geometries, attribute data, projection
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43 information and a special file storing meta information ({\tt
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44 meta.xml}) for this artifact in the a corresponding directory in the
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45 {\tt shapefile-directory}.
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46
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47 \item After that the so called {\tt map-generator}
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48 is triggered. The map-generator searches the {\tt shape-directory}
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49 and its subfolders with all existing {\tt meta.xml} files and
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50 generates a central configuration file for the mapserver at {\tt
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51 map-generator/mapfile@path}. Each shapefile will be published as a WMS
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52 layer. \\
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53 The generated mapfile is constructed out of a base template from {\tt
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54 map-generator/templates/maptemplate} and a parameter-/layer-specific
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55 part generated from {\tt map-generator/templates/path}. The
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56 selection of the correct file-based templates is extracted out of
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57 the {\tt meta.xml}-file.
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58
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59 \item The matching between the generated geograpic data and the corresponding
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60 style files is been done by the artifact-server, constructing
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61 filenames of maptemplates out of parameter-information. For
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62 horizontal-cross-sections the schema looks like this {\tt
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63 horizontalcrosssection\_\$NAME-OF-PARAMETER}; for layer-orientated
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64 FIS like e.g. NAUTHIS and CONTIS like this {\tt
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65 layer\_\$ID\_MAPSERVICE\_\$ID\_LAYER} e.g.
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66 {\tt layer\_BSH\_IMS\_CONTIS\_Resources\_2}.
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67 %% FIXME@TE: Marine Feature? Name of WMS?
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68 In order to set at least title, geometry-type and path to the
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69 corresponding shapefile dynamically a templating language, called
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70 {\tt velocity} is used.
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71
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72 \item The corresponding subfolder of an artifact in {\tt
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73 shape-directory} with their shapefiles
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74 and {\tt meta.xml}-document will be deleted after the time of
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75 expiry. By triggering the {\tt map-generator} the next time, the
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76 geographic data and the central configuration of the mapserver will
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77 be updated.
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78
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79 \end{enumerate}
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80
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81 The coupling of the artifact-server and mapserver is free of
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82 maintenance. The artifact-server as master cares about deleting and
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83 updating the configuration of the mapserver.
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84
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85 \begin{lstlisting}
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86 artifact-database
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87 |-- gnv # charts, palettes, interpolation parameters
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88 | |-- map-generator
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89 | |-- shapefile-directory
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90 | `-- horizontal-cross-section
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91 |-- mapserver
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92 `-- velocity
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93 \end{lstlisting}
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94
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95 \paragraph*{mapserver}
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96 {\em Function}: URL of the mapserver where request can be send to. The
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97 URL will be used for displaying the location e.g. in the GNV-WebClient and in
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98 the {\tt meta.xml}-file.
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99
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100 \begin{itemize}
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101 \item {\tt server}: URL of the mapserver where request can send to.
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102 \end{itemize}
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103
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104 \paragraph*{velocity}
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105 {\em Function}: Templating language used in the maptemplates at {\tt
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106 map-generator/templates/path} for accessing the parameters from
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107 dynamically generated {\tt meta.xml}-configuration of artifacts
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108
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109 \begin{itemize}
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110 \item {\tt logfile}: Setting the path to write log files.
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111 Preconfigured to {\tt /var/log/artifacts/velocity.log}. {\bf Just
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112 absolute pathes are allowed here!}
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113 \end{itemize}
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114
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115 \paragraph*{map-generator}
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116 {\em Function}: Mechanism for generating configuration for the {\tt
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117 mapserver} dynamically. For background information about the interaction
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118 between artifact-server and mapserver, see above.
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119
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120 \begin{itemize}
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121 \item {\tt mapfile}: path to the mapfile accessed by the WMS wrapper
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122 {\tt gnv-wms}
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123 \item {\tt templates}: \\ {\tt path} to the directory where
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124 parameter-specific mapconfiguartions (as *.vm) are stored.
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125 \\ {\tt
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126 maptemplate} containing the WMS instance-specific configurations and
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127 metadata, like overall boundingbox, spatial reference systems and
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128 contact data.
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129 \end{itemize}
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130
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131 \paragraph*{shapefile-directory}
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132 {\em Function}: Pointer where shapefiles for map-generation are stored
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133
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134 \begin{itemize}
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135 \item {\tt path}: path to the directory where shapefiles are stored
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136 and accessed by {\tt mapserver}
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137 \end{itemize}
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138
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139 \paragraph*{horizontal-cross-section}
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140 {\em Function}: Parameterization for the interpolation algorithm for
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141 horizontal-cross-sections (maps).
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142
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143
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144 \begin{itemize}
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145 \item {\tt sample}: The attribute {\tt number} sets the number of
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146 steps for the interpolation grid.
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147 \item {\tt ground}: {\tt interpolation} method for calculating the
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148 interpolation from the last measured value in meshes against the seafloor.
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149 Available methods are {\tt nearest-neighbor | bilinear | bicubic}.
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150 %% FIXME: Could not find nn and bicubic in the code ...
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151 \end{itemize}
http://dive4elements.wald.intevation.org