Kernel density estimation. If any point is currently in selection only selected points are taken into account.

Fotheringham, A.S., Brunsdon, C., Charlton, M. (2000): Quantitative Geography. Sage. 270p.

Lloyd, C.D. (2010): Spatial data analysis - An introduction for GIS users. Oxford. 206p.

Name	Type	Identifier	Description	Constraints
Input
Points	shapes, input	POINTS
Target System	grid, input, optional	TARGET_TEMPLATE	use this grid's system for output grids
Output
Target Grid	grid, output	TARGET_OUT_GRID
Options
Population	table field	POPULATION
Scale	boolean	POP_ADJUST		Default: 0
Range	value range	POP_RANGE
Radius	floating point number	RADIUS	kernel radius in map units	Minimum: 0.000000 Default: 1.000000
Kernel	choice	KERNEL		Available Choices: [0] quartic [1] gaussian [2] exponential Default: 1
Target Grid System	choice	TARGET_DEFINITION		Available Choices: [0] user defined [1] grid or grid system Default: 0
Cellsize	floating point number	TARGET_USER_SIZE		Minimum: 0.000000 Default: 1.000000
West	floating point number	TARGET_USER_XMIN		Default: 0.000000
East	floating point number	TARGET_USER_XMAX		Default: 100.000000
South	floating point number	TARGET_USER_YMIN		Default: 0.000000
North	floating point number	TARGET_USER_YMAX		Default: 100.000000
Columns	integer number	TARGET_USER_COLS	Number of cells in East-West direction.	Minimum: 1 Default: 101
Rows	integer number	TARGET_USER_ROWS	Number of cells in North-South direction.	Minimum: 1 Default: 101
Rounding	boolean	TARGET_USER_FLAT	Round bounding coordinates to multiples of cell size. Ignored if cell size has decimal places.	Default: 1
Fit	choice	TARGET_USER_FITS		Available Choices: [0] nodes [1] cells Default: 0