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c

geotrellis.spark.sigmoidal

RDDMultibandSigmoidalMethods

abstract class RDDMultibandSigmoidalMethods[K, V] extends MethodExtensions[RDD[(K, V)]]

Linear Supertypes
MethodExtensions[RDD[(K, V)]], Serializable, Serializable, AnyRef, Any
Known Subclasses
withRDDMultibandSigmoidalMethods
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  1. RDDMultibandSigmoidalMethods
  2. MethodExtensions
  3. Serializable
  4. Serializable
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  6. Any
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Instance Constructors

  1. new RDDMultibandSigmoidalMethods()(implicit arg0: (V) ⇒ MultibandTile)

Abstract Value Members

  1. abstract def self: RDD[(K, V)]
    Definition Classes
    MethodExtensions

Concrete Value Members

  1. def sigmoidal(alpha: Double, beta: Double): RDD[(K, MultibandTile)]

    Given parameters alpha and beta, return an RDD of tiles where the sigmoidal contrast operation has been performed on each band of each tile.

    Given parameters alpha and beta, return an RDD of tiles where the sigmoidal contrast operation has been performed on each band of each tile.

    The approach used is described here: https://www.imagemagick.org/Usage/color_mods/#sigmoidal

    alpha

    The center around-which the stretch is performed (given as a fraction)

    beta

    The standard deviation in the computation, used to avoid saturating the upper and lower parts of the gamut

    returns

    An RDD of output tiles