Updated OsmPlugin (markdown)
tmcw
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1 changed files with 48 additions and 52 deletions
98
OsmPlugin.md
98
OsmPlugin.md
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@ -1,10 +1,4 @@
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<!-- Name: OsmPlugin -->
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<!-- Version: 27 -->
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<!-- Last-Modified: 2010/11/13 10:24:18 -->
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<!-- Author: kunitoki -->
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Mapnik's PluginArchitecture supports the use of different input formats.
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Mapnik's [[PluginArchitecture]] supports the use of different input formats.
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This plugin allows for the direct reading of data from the [OpenStreetMap XML format](http://wiki.openstreetmap.org/wiki/.osm). You can use it in two different ways; you can either render a local file, or connect to a URL which provides OSM XML data within a given bounding box.
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@ -34,18 +28,19 @@ Your layer's Datasource must have a "type" parameter with a value of "osm", in a
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For example:
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#!xml
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<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
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<StyleName>residential</StyleName>
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<StyleName>unclassified</StyleName>
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<StyleName>secondary</StyleName>
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<StyleName>primary</StyleName>
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<StyleName>motorway</StyleName>
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<Datasource>
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<Parameter name="type">osm</Parameter>
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<Parameter name="file">test2.osm</Parameter>
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</Datasource>
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</Layer>
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```xml
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<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
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<StyleName>residential</StyleName>
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<StyleName>unclassified</StyleName>
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<StyleName>secondary</StyleName>
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<StyleName>primary</StyleName>
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<StyleName>motorway</StyleName>
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<Datasource>
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<Parameter name="type">osm</Parameter>
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<Parameter name="file">test2.osm</Parameter>
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</Datasource>
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</Layer>
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```
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## Specifying the data's source
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@ -54,19 +49,20 @@ OSM data may be sourced from two different places: a file (as in the example abo
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For a web data source, we must provide two parameters: the base URL and the bounding box in WGS84 latitude/longitude. These two parameters are named "url" and "bbox". The full URL of the OSM data server will be constructed from the base URL with the bounding box added as a query string. Here is an example:
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#!xml
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<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
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<StyleName>residential</StyleName>
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<StyleName>unclassified</StyleName>
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<StyleName>secondary</StyleName>
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<StyleName>primary</StyleName>
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<StyleName>motorway</StyleName>
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<Datasource>
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<Parameter name="type">osm</Parameter>
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<Parameter name="url">http://www.osmdataserver.com/data.php</Parameter>
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<Parameter name="bbox">-0.8,51,-0.7,51.1<Parameter>
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</Datasource>
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</Layer>
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```xml
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<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
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<StyleName>residential</StyleName>
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<StyleName>unclassified</StyleName>
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<StyleName>secondary</StyleName>
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<StyleName>primary</StyleName>
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<StyleName>motorway</StyleName>
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<Datasource>
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<Parameter name="type">osm</Parameter>
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<Parameter name="url">http://www.osmdataserver.com/data.php</Parameter>
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<Parameter name="bbox">-0.8,51,-0.7,51.1<Parameter>
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</Datasource>
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</Layer>
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```
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In the above example, the full URL of the OSM data server would be `http://www.osmdataserver.com/data.php?bbox=-0.8,51,-0.7,51.1`. Data will be downloaded from this URL and rendered according to the rules in the style file.
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@ -75,25 +71,25 @@ In the above example, the full URL of the OSM data server would be `http://www.o
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Styling the output is done in the same way as for other data sources, with tests for different tags done in the `<Filter>` tag. For example this rule will match OSM ways where the 'highway' tag is equal to 'path' and the 'foot' tag is equal to 'designated':
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#!xml
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<Rule>
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<Filter>[highway] = 'path' and [foot] = 'designated'</Filter>
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<LineSymbolizer>
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<CssParameter name="stroke">#fff</CssParameter>
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<CssParameter name="stroke-width">6</CssParameter>
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<CssParameter name="stroke-linejoin">round</CssParameter>
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<CssParameter name="stroke-linecap">round</CssParameter>
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<CssParameter name="stroke-opacity">0.4</CssParameter>
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</LineSymbolizer>
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<LineSymbolizer>
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<CssParameter name="stroke">red</CssParameter>
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<CssParameter name="stroke-width">2.0</CssParameter>
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<CssParameter name="stroke-dasharray">1,4</CssParameter>
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<CssParameter name="stroke-linejoin">round</CssParameter>
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<CssParameter name="stroke-linecap">round</CssParameter>
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</LineSymbolizer>
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</Rule>
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```xml
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<Rule>
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<Filter>[highway] = 'path' and [foot] = 'designated'</Filter>
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<LineSymbolizer>
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<CssParameter name="stroke">#fff</CssParameter>
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<CssParameter name="stroke-width">6</CssParameter>
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<CssParameter name="stroke-linejoin">round</CssParameter>
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<CssParameter name="stroke-linecap">round</CssParameter>
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<CssParameter name="stroke-opacity">0.4</CssParameter>
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</LineSymbolizer>
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<LineSymbolizer>
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<CssParameter name="stroke">red</CssParameter>
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<CssParameter name="stroke-width">2.0</CssParameter>
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<CssParameter name="stroke-dasharray">1,4</CssParameter>
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<CssParameter name="stroke-linejoin">round</CssParameter>
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<CssParameter name="stroke-linecap">round</CssParameter>
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</LineSymbolizer>
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</Rule>
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```
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## Lines or polygons?
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