[Tile-serving] [openstreetmap/mod_tile] getting blank tile while using mod_tile with mapnik to serve geotiff file (Issue #432)

[Alexander Sago]

cagelight left a comment (openstreetmap/mod_tile#432)

@hummeltech Sorry for the delay, I must have had notifications disabled. 

We were using these for testing, confirmed valid referenced TIFFs:
https://www.naturalearthdata.com/downloads/50m-raster-data/50m-natural-earth-2/

And pretty much any minimal mapnik.xml will do, we tried many, many variants to no avail. So I'd be interested to see which (if any) work for you on the other hand.
But just an example of something we tried:

```XML
<?xml version="1.0" encoding="utf-8"?>
<Map srs="+init=epsg:4326">
  <Style name="raster">
    <Rule>
      <RasterSymbolizer/>
    </Rule>
  </Style>

  <Layer name="raster" status="on" srs="+init=epsg:4326">
    <StyleName>raster</StyleName>
    <Datasource>
      <Parameter name="type">gdal</Parameter>
      <Parameter name="file">/data/tiff/test.tif</Parameter>
    </Datasource>
  </Layer>
</Map>
```

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