Using Cloud Optimized Geotiff files (COG)
A “Cloud Optimized Geotiff file” is an ordinary GeoTIFF file, served by an HTTP server, and organized in order to allow better network flow on the web.
Our Web servers are configured specifically to serve this kind of files. These
files should be stored into the
cog directory of your storage space
and ended with
Send your GeoTIFF files in this directory, and there will be accessible at
the adresse of your Lizmap instance, plus this kind of path
Example: your instance is accessible at the address
and you uploaded the file
map.cog.tif into the directory
cog of your
storage space. Your GeoTIFF file will then be accessible from
You can then use this GeoTIFF file as a raster datasource in a QGIS layer. In the datasource manager of QGIS, you add a raster datasource by indicating the source type “Protocol: HTTP(S), cloud..”, the protocol type “HTTP/HTTPS/FTP”, and the web address of your GeoTiff file.
There is no support of authenticated method to access to your GeoTIFF files.