Tool Name	Grid Proximity Buffer
Tool ID	10
Library ID	grid_tools
Version	1.0
Author(s)	Copyrights (c) 2006 by Volker Wichmann

Description

This tool calculates the euclidean distance within a buffer distance from all NoData cells to the nearest valid neighbour in a source grid. Additionally, the source cells define the zones that will be used in the euclidean allocation calculations. Cell values in the source grid are treated as IDs (integer) and used in the allocation grid to identify the grid value of the closest source cell. If a cell is at an equal distance to two or more sources, the cell is assigned to the source that is first encountered in the tools scanning process. The buffer grid is a reclassification of the distance grid using a user specified equidistance to create a set of discrete distance buffers from source features. The buffer zones are coded with the maximum distance value of the corresponding buffer interval. The output value type for the distance grid is floating-point. The output values for the allocation and buffer grid are of type integer. The duration of tool execution is dependent on the number of source cells and the buffer distance.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Source Grid	grid, input	SOURCE	Grid with features to be buffered [Category/NoData]
Output
Distance Grid	grid, output	DISTANCE	Grid with euclidean distance to nearest source cell [grid units]
Allocation Grid	grid, output	ALLOC	Grid with category of nearest source cell [Category]
Buffer Grid	grid, output	BUFFER	Reclassification of distance grid to buffer zones with a width equal to the equidistance value.
Options
Buffer distance	floating point number	DIST	Buffer distance (grid units).	Default: 500.000000
Equidistance	integer number	IVAL	Reclassify buffer distance to intervals of euqidistance ...	Default: 100