Package org.opengis.coverage

Coverages (generate a value for any point).

See:
Description

Interface Summary

Coverage	Provides access to a coverage.
SampleDimension	Contains information for an individual sample dimension of coverage.

Class Summary

ColorInterpretation	Specifies the mapping of a band to a color model component.
PaletteInterpretation	Describes the color entry in a color table.
SampleDimensionType	Specifies the various dimension types for coverage values.

Exception Summary

CannotEvaluateException	The base class for exceptions thrown when a quantity can't be evaluated.
MetadataNameNotFoundException	Thrown when a requested metadata is not found.
PointOutsideCoverageException	Thrown when a evaluate(…) method is invoked with a point outside coverage.

Package org.opengis.coverage Description

Coverages (generate a value for any point). The following is adapted from OpenGIS® Grid Coverages Implementation Specification.

The architecture of the grid coverage specification is composed of three packages. The specification includes a package for the general coverage specification (CV), a package specifically for grid coverages (GC) and a package for grid coverage processing (GP). The GP package is optional and not required for an OGC compliant implementation.

Color Palettes

A coverage can have a color palette. A color palette is valid for only coverages which are integer values (usually bytes). Color palettes supported include gray scale, RGB, HLS and CMYK. The coverage dimension information maps the grid sample dimensions to a color palette or to color model components. For example 8-bit pseudo color TIFF image would be represented as a grid with one sample dimension and a color palette with 256 RGB entries. A 24-bit RGB TIFF file would be represented as a grid with three bands and no color palette. The dimension information would indicate which bands to use for the RGB color components. The following illustrates example values for different color components:

Gray Scale	Vector contains one entry which a shade of gray. 0 is black and 255 is white.
RGB	Vector contains three values: Red Green Blue. Each value ranges from 0 to 255 where 0 is no intensity and 255 is maximum intensity.
RGBA	Vector contains four values RGBA: Red Green Blue Alpha. The alpha value is the level of transparency of the color. Alpha of 0 is transparent and 255 is opaque.
HLS	Vector contains three values: Hue Saturation Lightness. Hue is a value from 0 to 360. Saturation is a value from 0 to 100 where 0 is no color intensity and 100 is full color intensity. Lightness is a value from 0 to 100 where 0 is no lightness and 100 is full lightness.
CMYK	Vector contains four values: Cyan Magenta Yellow Black. Each value ranges from 0 to 255 where 0 is no intensity and 255 is maximum intensity.