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Updated Raster (markdown)

tmcw 2011-12-09 12:16:10 -08:00
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Raster.md

@ -6,15 +6,15 @@
This plugin supports reading tiff and geotiff files.
Tiled or Stripped tiff files are required and when rasters are small < 200-300 MB this driver is faster that the [wiki:GDAL] plugin.
Tiled or Stripped tiff files are required and when rasters are small < 200-300 MB this driver is faster that the [[GDAL]] plugin.
If files are larger it is recommended to build GDAL overviews (with gdaladdo command) and instead read with the [wiki:GDAL] plugin.
If files are larger it is recommended to build GDAL overviews (with gdaladdo command) and instead read with the [[GDAL]] plugin.
* Note: overviews support is available only in Mapnik >= 0.7.0.
A drawback(or advantage!) of this plugin is that it requires manually setting the file bounds.
* hint: create a GDAL datasource from your tiff in python, call the envelope() method to get the bounds, and use those.
For other plugins see: PluginArchitecture
For other plugins see: [[PluginArchitecture]]
# Installation
@ -27,15 +27,56 @@ To check if the raster plugin built and was installed correctly you can do:
# Parameters
|| *parameter* || *value* || *description* || *default* ||
|| file || string || geotiff file path || ||
|| base || string || optional base path where to search for the tiff raster file || ||
|| lox || double || lower x corner of the image in map coordinates || ||
|| loy || double || lower y corner of the image in map coordinates || ||
|| hix || double || upper x corner of the image in map coordinates || ||
|| hiy || double || upper y corner of the image in map coordinates || ||
|| extent || string || extent of the image in map coordinates, comma or space separated (at least <lox> <loy> <hix> <hiy> or <extent> should be passed) || ||
|| format || string || image format to use, currently only tiff is supported || tiff ||
<table>
<tr>
<td> <strong>parameter</strong> </td>
<td> <strong>value</strong> </td>
<td> <strong>description</strong> </td>
<td> <strong>default</strong> </td>
</tr>
<tr>
<td> file </td>
<td> string </td>
<td> geotiff file path </td>
</tr>
<tr>
<td> base </td>
<td> string </td>
<td> optional base path where to search for the tiff raster file </td>
</tr>
<tr>
<td> lox </td>
<td> double </td>
<td> lower x corner of the image in map coordinates </td>
</tr>
<tr>
<td> loy </td>
<td> double </td>
<td> lower y corner of the image in map coordinates </td>
</tr>
<tr>
<td> hix </td>
<td> double </td>
<td> upper x corner of the image in map coordinates </td>
</tr>
<tr>
<td> hiy </td>
<td> double </td>
<td> upper y corner of the image in map coordinates </td>
</tr>
<tr>
<td> extent </td>
<td> string </td>
<td> extent of the image in map coordinates, comma or space separated (at least <lox> <loy> <hix> <hiy> or <extent> should be passed) </td>
</tr>
<tr>
<td> format </td>
<td> string </td>
<td> image format to use, currently only tiff is supported </td>
<td> tiff </td>
</tr>
</table>
# Styling
@ -51,10 +92,10 @@ See the docstring at: http://svn.mapnik.org/trunk/docs/api_docs/python/mapnik-mo
== XML ==
#!xml
<!-- NOTE: must be in the same SRS as your map-->
<Layer name="Raster">
```xml
#!xml
<!-- NOTE: must be in the same SRS as your map-->
<Layer name="Raster">
<StyleName>raster</StyleName>
<Datasource>
<Parameter name="type">raster</Parameter>
@ -64,7 +105,8 @@ See the docstring at: http://svn.mapnik.org/trunk/docs/api_docs/python/mapnik-mo
<Parameter name="hix">max_x</Parameter>
<Parameter name="hiy">max_y</Parameter>
</Datasource>
</Layer>
</Layer>
```
## C++