<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over" background-color="rgba(255,255,255,1)"> <Style name="testmerc" filter-mode="first" > <Rule> <RasterSymbolizer opacity="1" scaling="bilinear" /> </Rule> </Style> <Layer name="testmerc" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over"> <StyleName>testmerc</StyleName> <Datasource> <!-- https://github.com/mapnik/mapnik/issues/1508 --> <!-- note: this mis-reports it is premultiplied - it is not --> <Parameter name="file">../../data/raster/river_merc.tiff</Parameter> <Parameter name="extent">-8249238.098993212,-486119.1339340762,-8024337.037783274,-302066.9754826002</Parameter> <Parameter name="type">raster</Parameter> </Datasource> </Layer> </Map>