Main menu

Pages

Edit post

Rescale by Function, Slice

Husam Jubeh
(0)

Rescale by Function, Slice Tools

Rescale by Function

How to use Rescale by Function Tool in Arc Toolbox??

Rescale by Function Tool
Rescale by Function

Path to access the tool

:

Rescale by Function Tool, Reclass Toolset, Spatial Analyst Tools Toolbox

 

Rescale by Function

Rescales the input raster values by applying a selected transformation function and then transforming the resulting values onto a specified continuous evaluation scale.

1. Input raster

The input raster to rescale.

2. Output raster

The output rescaled raster.

The output will be a floating-point raster with values ranging from (or within) the From scale and the To scale evaluation values.

3. Transformation function (optional)

Specifies the continuous function to transform the values from the input raster.

The transformation functions are used to specify the function to rescale the input data. A general description of each function and the default values for the functions are detailed in the table below.

  • Exponential—Rescale input values using an exponential function.Use when the preference increases with an increase in the input values and the preference increases more rapidly as the input values become larger.

  1. Input shift—The default is derived from the input raster.
  2. Base factor—The default is derived from the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • Gaussian—Rescale input values using a Gaussian function.The midpoint of the normal distribution defines the most preferred value and is generally assigned to the To scale. Preference values decrease as the values move from the midpoint until eventually reaching the least preference with the lowest and highest input values generally being assigned to the From scale.

  1. Midpoint—The default is derived from the input raster.
  2. Spread—The default is derived from the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  •  Large—Used to indicate that the larger values from the input raster have higher preference.The midpoint identifies the crossover point with input values greater than the midpoint having increasing preference and values below having decreasing preference.

  1. Midpoint—The default is derived from the input raster.
  2. Spread—The default is 5.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  •  Linear—Rescale the input values using a linear function.When the minimum is less than the maximum the larger values are more preferred.

  1. Minimum—The default is the Minimum of the input raster.
  2. Maximum—The default is the Maximum of the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  •  Logarithm—Rescale input data using a logarithm function.Used when the preference for the lower input values increases rapidly. As the input values increase, the preference tapers off, with a further increase in the input values.

  1. Input shift—The default is derived from the input raster.
  2. Factor—The default is derived from the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • LogisticDecay—Rescale input data using a logistic decay function.Used when small input values are most preferred. As the values increase, the preferences rapidly decrease, until the preferences taper off at the larger input values.
  1. Minimum—The default is the Minimum of the input raster.
  2. Maximum—The default is the Maximum of the input raster.
  3. Y intercept percent—The default is 99.0.
  4. Lower threshold—The default is the Minimum of the input raster.
  5. Value below threshold—The default is the From scale.
  6. Upper threshold—The default is the Maximum of the input raster.
  7. Value above threshold—The default is the To scale.
  • LogisticGrowth—Rescale input data using a logistic growth function.Used when small input values are least preferred. As the values increase, the preferences rapidly increase, until the preferences taper off at the larger input values.

  1. Minimum—The default is the Minimum of the input raster.
  2. Maximum—The default is the Maximum of the input raster.
  3. Y intercept percent—The default is 1.0.
  4. Lower threshold—The default is the Minimum of the input raster.
  5. Value below threshold—The default is the From scale.
  6. Upper threshold—The default is the Maximum of the input raster.
  7. Value above threshold—The default is the To scale.
  •  MSLarge—Rescale input data based on the mean and standard deviation, where larger values in the input raster have higher preference.The result can be similar to the Large function, depending on how the multipliers of the mean and standard deviation are defined.
  1. Mean multiplier—The default is 1.
  2. Standard deviation multiplier—The default is 1.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • MSSmall—Rescale input data based on the mean and standard deviation, where smaller values in the input raster have higher preference.The result can be similar to the Small function, depending on how the multipliers of the mean and standard deviation are defined.

  1. Mean multiplier—The default is 1.
  2. Standard deviation multiplier—The default is 1.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • Near—Use when the input values very close to the midpoint are preferred.Near is similar to the Gaussian function but decreases at a faster rate.

  1. Midpoint—The default is derived from the input raster.
  2. Spread—The default is derived from the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • Power—Rescale the input data, applying a power function using a specified exponent.Use when the preference for the input values increases rapidly, with an increase in the input values.
  1. Input shift—The default is derived from the input raster.
  2. Exponent—The default is derived from the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • Small—Use to indicate that the smaller values from the input raster have higher preference.The midpoint identifies the crossover point, with input values below the midpoint having increasing preference, and values that are greater having decreasing preference.

  1. Midpoint—The default is derived from the input raster.
  2. Spread—The default is 5.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.
  • SymmetricLinear—Rescale input data by mirroring a linear function around the midpoint of the minimum and maximum.Use when a particular input value is the most preferred, with the preferences decreasing linearly as the input values move from the mirrored point.

  1. Minimum—The default is the Minimum of the input raster.
  2. Maximum—The default is the Maximum of the input raster.
  3. Lower threshold—The default is the Minimum of the input raster.
  4. Value below threshold—The default is the From scale.
  5. Upper threshold—The default is the Maximum of the input raster.
  6. Value above threshold—The default is the To scale.

The default transformation is MSSmall.

4. From scale (optional)

The starting value of the output evaluation scale.

The From scale value cannot be equal to the To scale value. The From scale can be lower or higher than the To scale (for example, from 1 to 10, or from 10 to 1).

The value must be positive and it can be either an integer or double.

The default is 1.

5. To scale (optional)

The ending value of the output evaluation scale.

The To scale value cannot be equal to the From scale value. The To scale can be lower or higher than the From scale (for example, from 1 to 10, or from 10 to 1).

The value must be positive and it can be either an integer or double.

The default is 10. 

Slice

How to use Slice Tool in Arc Toolbox??

Slice Tool
Slice Tool

Path to access the tool

:

Slice Tool, Reclass Toolset, Spatial Analyst Tools 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.

Slice method (optional)

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

Base zone for output (optional)

Defines the lowest zone value on the output raster dataset.

The default value is 1.

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.

Latest articles from : Spatial Analyst

Comments

Post a Comment

table of contents title