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Updated OsmPlugin (markdown)

tmcw 2011-12-13 08:45:29 -08:00
parent 0a34edfff1
commit 68488c2c8d
1 changed files with 48 additions and 52 deletions
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OsmPlugin.md

@ -1,10 +1,4 @@
<!-- Name: OsmPlugin --> Mapnik's [[PluginArchitecture]] supports the use of different input formats.
<!-- Version: 27 -->
<!-- Last-Modified: 2010/11/13 10:24:18 -->
<!-- Author: kunitoki -->
Mapnik's PluginArchitecture supports the use of different input formats.
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. 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.
@ -34,8 +28,8 @@ Your layer's Datasource must have a "type" parameter with a value of "osm", in a
For example: For example:
#!xml ```xml
<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84"> <Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
<StyleName>residential</StyleName> <StyleName>residential</StyleName>
<StyleName>unclassified</StyleName> <StyleName>unclassified</StyleName>
<StyleName>secondary</StyleName> <StyleName>secondary</StyleName>
@ -45,7 +39,8 @@ For example:
<Parameter name="type">osm</Parameter> <Parameter name="type">osm</Parameter>
<Parameter name="file">test2.osm</Parameter> <Parameter name="file">test2.osm</Parameter>
</Datasource> </Datasource>
</Layer> </Layer>
```
## Specifying the data's source ## Specifying the data's source
@ -54,8 +49,8 @@ OSM data may be sourced from two different places: a file (as in the example abo
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: 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:
#!xml ```xml
<Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84"> <Layer name="roads" status="on" srs="+proj=latlong +datum=WGS84">
<StyleName>residential</StyleName> <StyleName>residential</StyleName>
<StyleName>unclassified</StyleName> <StyleName>unclassified</StyleName>
<StyleName>secondary</StyleName> <StyleName>secondary</StyleName>
@ -66,7 +61,8 @@ For a web data source, we must provide two parameters: the base URL and the boun
<Parameter name="url">http://www.osmdataserver.com/data.php</Parameter> <Parameter name="url">http://www.osmdataserver.com/data.php</Parameter>
<Parameter name="bbox">-0.8,51,-0.7,51.1<Parameter> <Parameter name="bbox">-0.8,51,-0.7,51.1<Parameter>
</Datasource> </Datasource>
</Layer> </Layer>
```
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. 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.
@ -75,8 +71,8 @@ In the above example, the full URL of the OSM data server would be `http://www.o
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': 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':
#!xml ```xml
<Rule> <Rule>
<Filter>[highway] = 'path' and [foot] = 'designated'</Filter> <Filter>[highway] = 'path' and [foot] = 'designated'</Filter>
<LineSymbolizer> <LineSymbolizer>
<CssParameter name="stroke">#fff</CssParameter> <CssParameter name="stroke">#fff</CssParameter>
@ -92,8 +88,8 @@ Styling the output is done in the same way as for other data sources, with tests
<CssParameter name="stroke-linejoin">round</CssParameter> <CssParameter name="stroke-linejoin">round</CssParameter>
<CssParameter name="stroke-linecap">round</CssParameter> <CssParameter name="stroke-linecap">round</CssParameter>
</LineSymbolizer> </LineSymbolizer>
</Rule> </Rule>
```
## Lines or polygons? ## Lines or polygons?