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You can export OSM XYT Tiles background map as raster file: right click on the OpenStreetMap layer and select Export / Save as... to save a copy of the background tiled map as raster file. Be sure to define the extent and resolution of the raster.
To get the extent of a layer, simply click Calculate from Layer... in the Extent section of the dialog window (...
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You must provide all required parameters. Parameter values must have proper type, e.g. setting tile size tw=100 is correct, but tw=100.0 will not work.
CREATE TABLE
rasters.global_dem_retiled
AS
SELECT
st_retile(
'rasters.global_dem', -- source raster table
'rast', -- raster column
ST_SetSRID(ST_Extent(...
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