3D Analyst Tools ArcToolbox

Aggregate, Boundary Clean, Expand and Majority Filter Tools

Aggregate

How to use Aggregate Tool in Arc Toolbox??

Aggregate Tool

Path to access the tool

:

Aggregate Tool, Generalization Toolset, Spatial Analyst Tools Toolbox

 

Aggregate

Generates a reduced-resolution version of a raster. Each output cell contains the Sum, Minimum, Maximum, Mean, or Median of the input cells that are encompassed by the extent of that cell.

1. Input raster

The input raster to aggregate.

It can be of integer or floating-point type.

2. Output raster

The output aggregated raster.

It is a reduced-resolution version of the input raster.

3. Cell factor

The factor by which to multiply the cell size of the input raster to obtain the desired resolution for the output raster.

For example, a cell factor value of three would result in an output cell size three times larger than that of the input raster.

The value must be an integer greater than 1.

4. Aggregation technique (optional)

Establishes how the value for each output cell will be determined.

The values of the input cells encompassed by the coarser output cell are aggregated by one of the following statistics:

1. SUM—The sum (total) of the input cell values.This is the default.
2. MAXIMUM—The largest value of the input cells.
3. MEAN—The average value of the input cells.
4. MEDIAN—The median value of the input cells.
5. MINIMUM—The smallest value of the input cells.

5. Expand extent if needed (optional)

Defines how to handle the boundaries of the input raster when its rows or columns are not a multiple of the cell factor.

1. Checked—Expands the top or right boundaries of the input raster so the total number of cells in a row or column is a multiple of the cell factor. Those expanded cells are given a value of NoData when put into the calculation.
2. Unchecked—Reduces the number of rows or columns in the output raster. This will truncate the remaining cells on the top or right boundaries of the input raster, making the number of rows or columns in the input raster a multiple of the cell factor.

With this option, the output raster can cover a smaller spatial extent than the input raster.

If the number of rows and columns in the input raster is a multiple of the Cell factor, these keywords are not used.

6. Ignore NoData in calculations (optional)

Denotes whether NoData values are ignored by the aggregation calculation.

1. Checked—Specifies that if NoData values exist for any of the cells that fall within the spatial extent of a larger cell on the output raster, the NoData values will be ignored when determining the value for output cell locations. Only input cells within the extent of the output cell that have data values will be used in determining the value of the output cell.
   
   This is the default.
2. Unchecked—Specifies that if any cell that falls within the spatial extent of a larger cell on the output raster has a value of NoData, the value for that output cell location will be NoData.
   
   When Unchecked is used, it is implied that when cells within an aggregation contain the NoData value, there is insufficient information to perform the specified calculations necessary to determine an output value.

Boundary Clean

How to use Boundary Clean Tool in Arc Toolbox??

Boundary Clean

Path to access the tool

:

Boundary Clean Tool, Generalization Toolset, Spatial Analyst Tools Toolbox

 

Boundary Clean

Smooths the boundary between zones by expanding and shrinking it.

1. Input raster

The input raster for which the boundary between zones will be smoothed.

It must be of integer type.

2. Output raster

The output generalized raster.

The boundaries between zones in the input will be smoothed.

The output is always of integer type.

3. Sorting technique (optional)

Specifies the type of sorting to use in the smoothing process.

This determines the priority by which cells can expand into their neighbors.

1. NO_SORT—Does no sorting by size. Zones with larger values have a higher priority to expand into zones with smaller values.This is the default.
2. DESCEND—Sorts zones in descending order by size. Zones with larger total areas have a higher priority to expand into zones with smaller total areas.
3. ASCEND—Sorts zones in ascending order by size. Zones with smaller total areas have a higher priority to expand into zones with larger total areas.

4. Run expansion and shrinking twice (optional)

Specifies the number of directions in which the smoothing process will take place.

1. Checked—Performs expansion and shrinking according to the specified sorting type, and then performs an additional shrinking and expansion with the priority reversed.This is the default.
2. Unchecked—Performs expansion and shrinking once, according to the sorting type.

Expand

How to use Expand Tool in Arc Toolbox??

Expand Tool

Path to access the tool

:

Expand Tool, Generalization Toolset, Spatial Analyst Tools Toolbox

 

Expand

Expands specified zones of a raster by a specified number of cells.

1. Input raster

The input raster for which the identified zones are to be expanded

It must be of integer type.

2. Output raster

The output generalized raster.

The specified zones of the input raster will be expanded by the specified number of cells.

The output is always of integer type.

3. Number of cells

The number of cells to expand each specified zone by.

The value must be an integer greater than 1.

4. Zone values

The list of zone values to expand.

The zone values must be integers. They can be in any order.

Majority Filter

How to Majority Filter Tool in Arc Toolbox ArcMap ArcGIS??

Majority Filter

Path to access the tool

:

Majority Filter Tool, Generalization Toolset, Spatial Analyst Tools Toolbox

 

Majority Filter

Replaces cells in a raster based on the majority of their contiguous neighboring cells.

1. Input raster

The input raster to be filtered based on the majority of contiguous neighboring cells.

It must be of integer type.

2. Output raster

The output filtered raster.

The output is always of integer type.

3. Number of neighbors to use (optional)

Determines the number of neighboring cells to use in the kernel of the filter.

1. FOUR— The kernel of the filter will be the four direct (orthogonal) neighbors to the present cell. This is the default.
2. EIGHT— The kernel of the filter will be the eight nearest neighbors (a three-by-three window) to the present cell.

4. Replacement threshold (optional)

Specifies the number of contiguous (spatially connected) cells that must be of the same value before a replacement will occur.

1. MAJORITY— A majority of cells must have the same value and be contiguous. Three out of four or five out of eight connected cells must have the same value.
2. HALF— Half of the cells must have the same value and be contiguous. Two out of four or four out of eight connected cells must have the same value. This option will have a more smoothing effect than the other.