Packages

c

geotrellis.spark.sigmoidal

RDDSinglebandSigmoidalMethods

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

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

  1. new RDDSinglebandSigmoidalMethods()(implicit arg0: (V) ⇒ Tile)

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, Tile)]

    Given parameters alpha and beta, return an RDD of tiles upon-which the sigmoidal contrast operation has been performed.

    Given parameters alpha and beta, return an RDD of tiles upon-which the sigmoidal contrast operation has been performed.

    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