Base sources

Chosen by "type" in base, sources.

Type	What it is
raster	A heightmap read from a GeoTIFF in its own projected coordinates, optionally resampled, to add relief to a real DEM.
chain	Several bases tried in order, each filling where those before it have no data; its grid is the first one's.

raster

A heightmap read from a GeoTIFF in its own projected coordinates, optionally resampled, to add relief to a real DEM.

Key	Type	Default	Range	Unit	Description
path	string	""			GeoTIFF to read the heights from; relative paths resolve against the configuration's folder.
band	integer	0			Band of the file to read, counting from 0.
pixel_size	number, optional	null	(0, inf)	m	Cell size in metres to resample the raster to over the same extent, as when upscaling a DEM. Unset keeps the file's.
resampling	one of nearest, bilinear, cubic	"cubic"			Interpolation used when resampling to the cell size.
scale	number, optional	null			Factor each sample is multiplied by, replacing the band's scale from the file's GDAL metadata. Unset keeps the file's.
offset	number, optional	null		m	Added to each scaled sample, replacing the band's offset from the file's GDAL metadata. Unset keeps the file's.
low_pass	number	0.0	[0, inf)	m	Standard deviation in metres of a Gaussian low-pass applied to the file's heights before any resampling, keeping a DEM's low frequencies for synthetic detail to be added to; a dem_detail layer can add the removed detail back. 0 keeps every frequency.

Every key with its default

{
    "type": "raster",
    "path": "",
    "band": 0,
    "pixel_size": null,
    "resampling": "cubic",
    "scale": null,
    "offset": null,
    "low_pass": 0.0
}

chain

Several bases tried in order, each filling where those before it have no data; its grid is the first one's.

Key	Type	Default	Range	Unit	Description
sources	list of base sources	[]			Bases tried in order, each filling where those before it have no data; the chain's grid is the first one's.

Every key with its default

{
    "type": "chain",
    "sources": []
}