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NAMEr3.neighbors - Makes each voxel value a function of the values assigned to the voxels around it, and stores new voxel values in an output 3D raster map KEYWORDSraster3d, algebra, voxel, statistics, aggregation, neighbor, focal statistics, filter SYNOPSISr3.neighbors
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DESCRIPTIONr3.neighbors looks at each voxel in a 3D raster input map layer, and examines the values assigned to the voxel in a user-defined "neighborhood" around it. It outputs a new 3D raster map in which each voxel is assigned a value that is a (user-specified) function of the values in that voxel’s neighborhood. For example, each voxel in the output map might be assigned a value equal to the average of the values appearing in its 3 x 3 x 3 voxel "neighborhood" in the input map layer. OPTIONSThe user must specify the names of the 3D raster map layers to be used for input and output, the method used to analyze neighborhood values (i.e., the neighborhood function or operation to be performed), and the moving window of the neighborhood. Neighborhood Operation Methods: The neighborhood operators determine what new value a center voxel in a neighborhood will have after examining values inside its neighboring voxels. Each voxel in a 3D raster map layer becomes the center voxel of a neighborhood as the neighborhood window moves from voxel to voxel throughout the map layer. r3.neighbors can perform the following operations:
Neighborhood Size: The neighborhood moving window specifies which voxel surrounding any given voxel fall into the neighborhood for that voxel. The window must be three comma separated odd integers. The dimension order is: x,y,z. For example: the parameter window=3,3,3 specifies a moving window (a cube) with 27 voxel. NOTESThe r3.neighbors program works in the current geographic region. It is recommended, but not required, that the 3D resolution of the geographic region be the same as that of the 3D raster map layer. r3.neighbors doesn’t propagate NULLs, but computes the aggregation over the non-NULL voxels in the neighborhood. SEE ALSOg.region, r.neighbors, r3.mapcalc, r3.stats, r3.support AUTHORSoeren Gebbert SOURCE CODEAvailable at: r3.neighbors source code (history) Latest change: Monday Feb 27 13:45:25 2023 in commit: a82501dc85294207e8e58437c3ec7f1056465ed4 Main index | 3D raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual
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