facing an issue with serving GeoTIFF files using mod_tile. Despite trying various solutions, I continue to receive blank tiles in the API response. Interestingly, I managed to successfully generate the same tiles using Python and Mapnik. I’ve included all relevant information below.

1. mapnik.xml

<?xml version="1.0" encoding="utf-8"?>
    <Map srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
        <Style name="raster-style">
            <Rule>
                  <RasterSymbolizer opacity="1.0" scaling="bilinear">
                      <Colorizer type="linear" epsilon="0.01">
                          <stop color="black" value="0"/>
                          <stop color="white" value="255"/>
                      </Colorizer>
                 </RasterSymbolizer>
            </Rule>
        </Style>
        <Layer name="GeoTIFF" status="true" srs="+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs">
            <StyleName>raster-style</StyleName>
                <Datasource>
                    <Parameter name="type">gdal</Parameter>
                    <Parameter name="file">/usr/share/renderd/mod_tile_poc/AQ.tiff</Parameter>
                    <Parameter name="estimate_extent">true</Parameter>
                    <Parameter name="log">/usr/share/renderd/mod_tile_poc/mapnik.log</Parameter>
                    <Parameter name="debug">debug</Parameter>
                </Datasource>
        </Layer>
    </Map>

2. renderd.conf

[renderd]
pid_file=/run/renderd/renderd.pid
socketname=/run/renderd/renderd.sock
stats_file=/run/renderd/renderd.stats
tile_dir=/var/cache/renderd/tiles

[mapnik]
font_dir=/usr/share/fonts
font_dir_recurse=0
plugins_dir=/usr/lib/mapnik/3.0/input

[default]
URI=/osm_tiles/
TILEDIR=/var/lib/mod_tile
XML=/usr/share/renderd/example-map/mapnik.xml
HOST=0.0.0.0
TILESIZE=256

[example-map]
URI=/tiles/renderd-example
XML=/usr/share/renderd/example-map/mapnik.xml

I’ve attempted all logging and methods outlined on the official site, but unfortunately, I’m still not seeing any results.