Hi all,
I'm beginning to use mapnik and I'm trying to draw a map using mapnik
with different logical layers:
Base: vector layer (A) with land information
Layer (B) with imaginery in GeoTIFF
Layer (C) with other images in GeoTIFF
Top: vector layer (D) with road information
I'm using blending in the style with layers B & C, so
A -> grain_merge B -> hard_light C
<Style name="rasterB">
<Rule>
<RasterSymbolizer>
<CssParameter name="scaling">bilinear</CssParameter>
<CssParameter name="mode">grain_merge</CssParameter>
</RasterSymbolizer>
</Rule>
</Style>
<Style name="rasterC">
<Rule>
<RasterSymbolizer>
<CssParameter name="scaling">bilinear</CssParameter>
<CssParameter name="mode">hard_light</CssParameter>
</RasterSymbolizer>
</Rule>
</Style>
Layer B is composed of different images so I define different layers,
one for each image as:
<Layer name="B_img01">
<StyleName>rasterB</StyleName>
<Datasource>
<Parameter name="type">gdal</Parameter>
<Parameter name="file">img1.tiff</Parameter>
</Datasource>
</Layer>
<Layer name="B_img02">
<StyleName>rasterB</StyleName>
<Datasource>
<Parameter name="type">gdal</Parameter>
<Parameter name="file">img2.tiff</Parameter>
</Datasource>
</Layer>
The problem is that, as defined in the style, when img1 and img2 overlap
they are blended, but what i would like to do is first combine the img1
and img2 with no blending and then blend the result. Is there any way to
do this in mapnik or I need to GIMP the overlapping images first?
TIA.
--
Jaume Figueras i Jové
Ubuntu User #14347 - Linux User #504317
Universitat Politècnica de Catalunya
Departament d'ESAII
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Centre de Simulació i Optimització de Processos Logístics (LogiSim)
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Enginyeria de Sistemes, Automàtica i Informàtica Industrial (ESAII)
http://webesaii.upc.es
Universitat Politècnica de Cataluyna
http://www.upc.edu
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