Terrain surface texture as proposed by Iwahashi & Pike (2007) for subsequent terrain classification.

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	DEM
Output
Texture	grid, output	TEXTURE
Options
Flat Area Threshold	floating point number	EPSILON	maximum difference between original and median filtered elevation (3x3 moving window) that still is recognized flat	Minimum: 0.000000 Default: 1.000000
Scale (Cells)	integer number	SCALE		Minimum: 1 Default: 10
Method	choice	METHOD		Available Choices: [0] counting cells [1] resampling Default: 1
Weighting Function	choice	DW_WEIGHTING		Available Choices: [0] no distance weighting [1] inverse distance to a power [2] exponential [3] gaussian Default: 3
Power	floating point number	DW_IDW_POWER		Minimum: 0.000000 Default: 2.000000
Bandwidth	floating point number	DW_BANDWIDTH	Bandwidth for exponential and Gaussian weighting	Minimum: 0.000000 Default: 0.700000