QGIS/resources/function_help/json/raster_statistic

{
  "name": "raster_statistic",
  "type": "function",
  "groups": ["Rasters"],
  "description": "Returns statistics from a raster layer.",
  "arguments": [
	{"arg":"layer", "description":"a string, representing either a raster layer name or layer ID"},
	{"arg":"band", "description":"integer representing the band number from the raster layer, starting at 1"},
	{"arg":"property", "description":"a string corresponding to the property to return. Valid options are:<br /><ul><li>min: minimum value</li><li>max: maximum value</li><li>avg: average (mean) value</li><li>stdev: standard deviation of values</li><li>range: range of values (max - min)</li><li>sum: sum of all values from raster</li></ul>"}
  ],
  "examples": [
	{ "expression":"raster_statistic('lc',1,'avg')", "returns":"Average value from band 1 from 'lc' raster layer"},
	{ "expression":"raster_statistic('ac2010',3,'min')", "returns":"Minimum value from band 3 from 'ac2010' raster layer"}
  ]
}