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Add mention of PgRaster plugin supporting RasterColorizer

Sandro Santilli 2016-03-23 11:08:41 +01:00
parent 28e84350d9
commit 9e1ae6a272
1 changed files with 4 additions and 3 deletions
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RasterSymbolizer.md

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The RasterSymbolizer is used to render an image from any [GDAL supported format](http://www.gdal.org/formats_list.html) using the [[GDAL]] plugin or from GeoTiff's using the [[Raster]] plugin. The RasterSymbolizer is used to render an image from any [GDAL supported format](http://www.gdal.org/formats_list.html) using the [[GDAL]] plugin, from GeoTiff's using the [[Raster]] plugin or from PostGIS using the [[PgRaster]] plugin.
* Mapnik supports on-the-fly reprojection of raster layers (like it does for vector layers) * Mapnik supports on-the-fly reprojection of raster layers (like it does for vector layers)
* However, for optimal performance it can be best to first (externally) warp an image to the Spatial Reference System (srs) used in the map (e.g. using the `gdalwarp` command from the gdal-utilities). * However, for optimal performance it can be best to first (externally) warp an image to the Spatial Reference System (srs) used in the map (e.g. using the `gdalwarp` command from the gdal-utilities).
@ -27,14 +27,15 @@ Processed as described in http://wiki.openstreetmap.org/wiki/Hillshading_using_t
| scaling | fast, bilinear, bilinear8 || fast: nearest neighbour, bilinear: bilinear interpolation for all 4 channels (RGBA), bilinear8 like bilinear, but only one channel assumed | | scaling | fast, bilinear, bilinear8 || fast: nearest neighbour, bilinear: bilinear interpolation for all 4 channels (RGBA), bilinear8 like bilinear, but only one channel assumed |
There are two types of raster datasources: *gdal* or *raster*: There are three types of raster datasources: *gdal*, *raster* or *pgraster*:
* The [[GDAL]] plugin is more convenient as it can read the file extents automatically and supports any GDAL-supported type of file * The [[GDAL]] plugin is more convenient as it can read the file extents automatically and supports any GDAL-supported type of file
* The [[Raster]] driver only works with Tiled or Stripped GeoTIFF files and requires manually setting the file bounds, but can be faster. * The [[Raster]] driver only works with Tiled or Stripped GeoTIFF files and requires manually setting the file bounds, but can be faster.
* The [[PgRaster]] driver requires manually setting the band number to use as databand.
## XML Layers ## XML Layers
See the [[GDAL]] plugin and [[Raster]] plugin pages for more info See the [[GDAL]], [[Raster]] and [[PgRaster]] plugin pages for more info
## XML Styles ## XML Styles