sample.json

{
	"image": "bitmap data url",
	"region": {
		"topleft": {
			"lat": 0,
			"lng": 0,
		},
		"bottomright": {
			"lat": 0,
			"lng": 0,
		}
	},
	"channels": [
		{
			"channel": 0,
			"inputrange": [ 0, 255 ],
			"outputrange": [ 0.0, 100.0 ],
			"name": "elevation",
			"unit": "m"
		},
		{
			"channel": 1,
			"inputrange": [ 0, 255 ],
			"outputrange": [ -50.0, 0.0 ],
			"name": "x",
			"unit": "m"
		},
		{
			"channel": 2,
			"map": {
				"1": "fornlämning #4",
				"5": "fornlämning #6"
			}
		}
	]
}