3D Analyst Tools ArcToolbox

Reclassify, Slice Tools

Reclassify

How to use Reclassify Tool in ArcToolbox ArcMap ArcGIS ??

Reclassify Tool

Reclassify Tool, Raster Reclass Toolset, 3D Analyst Toolbox

Reclassify

Reclassifies (or changes) the values in a raster.

1. Input raster

The input raster to be reclassified.

2. Reclass field

Field denoting the values that will be reclassified.

3. Reclassification

A remap table that defines how the values will be reclassified.

· Old values—The ranges of values of cells in the input raster. Acceptable settings are a single value, a range of values, a string, or NoData. A list of single values can be specified by separating each with a semicolon (;). A range of values can be specified by using a hyphen (-) as the range separator.

· New values—The new value to assign the values or ranges of values. Only integer values are supported.

· Classify—Opens the dialog box allowing the classification Method to be specified. The options are Manual, Equal Interval, Defined Interval, Quantile, Natural Breaks (Jenks), Geometrical Interval, and Standard Deviation.

· Unique—Reclassifies the input raster into unique values (lowest cell value of input will be value 1; next lowest input value will be 2; and so on).

· Add Entry—Adds a blank entry to the reclassification.

· Delete Entries—Deletes selected entries from the reclassification.

· Load—Loads a previously created remap table.

· Save—Saves the specified remap table.

· Reverse New Values—Re-sorts the New values list (for example, 1,2,3 becomes 3,2,1).

· Precision—Controls the numerical precision of the reclassification values.

4. Output raster

The output reclassified raster.

The output will always be of integer type.

5. Change missing values to NoData (optional)

Denotes whether missing values in the reclass table retain their value or get mapped to NoData.

· Unchecked—Signifies that if any cell location on the input raster contains a value that is not present or reclassed in a remap table, the value should remain intact and be written for that location to the output raster. This is the default.

· Checked—Signifies that if any cell location on the input raster contains a value that is not present or reclassed in a remap table, the value will be reclassed to NoData for that location on the output raster.

Slice

How to use Slice Tool in ArcToolbox ArcMap ArcGIS ??

Slice Tool

Slice Tool, Raster Reclass Toolset, 3D Analyst Toolbox

Slice

Slices or reclassifies the range of values of the input cells into zones of equal interval, equal area, or by natural breaks.

1. Input raster

The input raster to be reclassified.

2. Output raster

The output reclassified raster.

The output will always be of integer type.

3. Number of output zones

The number of zones to reclassify the input raster into.

When the slice method is EQUAL_AREA, the output raster will have the defined number of zones, with a similar number of cells in each.

When EQUAL_INTERVAL is used, the output raster will have the defined number of zones, each containing equal value ranges on the output raster.

When NATURAL_BREAKS is used, the output raster will have the defined number of zones, with the number of cells in each determined by the class breaks.

4. Slice method (optional)

The manner in which to slice the values in the input raster.

· EQUAL_INTERVAL—Determines the range of the input values and divides the range into the specified number of output zones. Each zone on the sliced output raster has the potential of having input cell values that have the same range from the extremes. This is the default.

· EQUAL_AREA—Specifies that the input values will be divided into the specified number of output zones, with each zone having a similar number of cells. Each zone will represent a similar amount of area.

· NATURAL_BREAKS—Specifies that the classes will be based on natural groupings inherent in the data. Break points are identified by choosing the class breaks that best group similar values and that maximize the differences between classes. The cell values are divided into classes whose boundaries are set when there are relatively big jumps in the data values.

5. Base zone for output (optional)

Defines the lowest zone value on the output raster dataset.

The default value is 1.