GeoTiffIIOMetadataDecoder (Geotools modules 22-SNAPSHOT API)

Object
- GeoTiffIIOMetadataDecoder

```
public final class GeoTiffIIOMetadataDecoder
extends Object
```
This class provides an abstraction from the details of TIFF data access for the purpose of retrieving GeoTIFFWritingUtilities metadata from an image.
All of the GeoKey values are included here as constants, and the portions of the GeoTIFFWritingUtilities specification pertaining to each have been copied for easy access.
The majority of the possible GeoKey values and their meanings are NOT reproduced here. Only the most important GeoKey code values have been copied, for others see the specification.
Convenience methods have been included to retrieve the various TIFFFields that are not part of the GeoKey directory, such as the Model Transformation and Model TiePoints. Retrieving a GeoKey from the GeoKey directory is a bit more specialized and requires knowledge of the correct key code.
Making use of the geographic metadata still requires some basic understanding of the GeoKey values that is not provided here.
For more information see the GeoTIFFWritingUtilities specification at http://www.remotesensing.org/geotiff/spec/geotiffhome.html

Author:

Mike Nidel, Simone Giannecchini, GeoSolutions

Constructor Summary

Constructors
Constructor and Description

GeoTiffIIOMetadataDecoder(IIOMetadata imageMetadata)
The constructor builds a metadata adapter for the image metadata root IIOMetadataNode.

Constructors
Constructor and Description
`GeoTiffIIOMetadataDecoder(IIOMetadata imageMetadata)` The constructor builds a metadata adapter for the image metadata root IIOMetadataNode.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`String`	`getAsciiTIFFTag(String tagID)` Returns the value of an ASCII TIFFTag referred by tagID.
`String`	`getGeoKey(int keyID)` Gets a GeoKey value as a String.
`int`	`getGeoKeyDirectoryVersion()` Gets the version of the GeoKey directory.
`int`	`getGeoKeyMinorRevision()` Gets the minor revision number of the GeoKeys in this metadata.
`GeoKeyEntry`	`getGeoKeyRecord(int keyID)` Gets a record containing the four TIFFShort values for a geokey entry.
`int`	`getGeoKeyRevision()` Gets the revision number of the GeoKeys in this metadata.
`Collection<GeoKeyEntry>`	`getGeoKeys()` Return the GeoKeys.
`PixelScale`	`getModelPixelScales()` Gets the model pixel scales from the correct TIFFField
`TiePoint[]`	`getModelTiePoints()` Gets the model tie points from the appropriate TIFFField
`AffineTransform`	`getModelTransformation()` Gets the model tie points from the appropriate TIFFField Attention, for the moment we support only 2D baseline transformations.
`double`	`getNoData()` Gets the noData from the related TIFFField.
`int`	`getNumGeoKeys()` Gets the number of GeoKeys in the geokeys directory.
`IIOMetadataNode`	`getRootNode()`
`boolean`	`hasGeoKey()` Return `true` if the geokey directory is present, `false` otherwise.
`boolean`	`hasModelTrasformation()` Tells me if the underlying `IIOMetadata` contains ModelTransformationTag tag for `AffineTransform` that map from Raster Space to World Space.
`boolean`	`hasNoData()` Tells me if the underlying `IIOMetadata` contains NoData Tag.
`boolean`	`hasPixelScales()` Tells me if the underlying `IIOMetadata` contains ModelTiepointTag tag for `TiePoint`.
`boolean`	`hasTiePoints()` Tells me if the underlying `IIOMetadata` contains ModelTiepointTag tag for `TiePoint`.

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - GeoTiffIIOMetadataDecoder
```
public GeoTiffIIOMetadataDecoder(IIOMetadata imageMetadata)
```
    The constructor builds a metadata adapter for the image metadata root IIOMetadataNode.
    
    Parameters:
    
    imageMetadata - The image metadata
- Method Detail
  - getGeoKeyDirectoryVersion
```
public int getGeoKeyDirectoryVersion()
```
    Gets the version of the GeoKey directory. This is typically a value of 1 and can be used to check that the data is of a valid format.
  - getGeoKeyRevision
```
public int getGeoKeyRevision()
```
    Gets the revision number of the GeoKeys in this metadata.
  - getGeoKeyMinorRevision
```
public int getGeoKeyMinorRevision()
```
    Gets the minor revision number of the GeoKeys in this metadata.
  - getNumGeoKeys
```
public int getNumGeoKeys()
```
    Gets the number of GeoKeys in the geokeys directory.
  - getGeoKey
```
public String getGeoKey(int keyID)
```
    Gets a GeoKey value as a String. This implementation should be "quiet" in the sense that it should not throw any exceptions but only return null in the event that the data organization is not as expected.
    
    Parameters:
    
    keyID - The numeric ID of the GeoKey
    
    Returns:
    
    A string representing the value, or null if the key was not found.
  - getGeoKeyRecord
```
public GeoKeyEntry getGeoKeyRecord(int keyID)
```
    Gets a record containing the four TIFFShort values for a geokey entry. For more information see the GeoTIFFWritingUtilities specification.
    
    Returns:
    
    the record with the given keyID, or null if none is found
  - getGeoKeys
```
public Collection<GeoKeyEntry> getGeoKeys()
```
    Return the GeoKeys.
    
    Returns:
  - getModelPixelScales
```
public PixelScale getModelPixelScales()
```
    Gets the model pixel scales from the correct TIFFField
  - getModelTiePoints
```
public TiePoint[] getModelTiePoints()
```
    Gets the model tie points from the appropriate TIFFField
    
    Returns:
    
    the tie points, or null if not found
  - getNoData
```
public double getNoData()
```
    Gets the noData from the related TIFFField. Check metadata has noData using hasNoData() method before calling this method.
    
    Returns:
    
    the noData value or Double.NaN in case of unable to get noData.
  - hasTiePoints
```
public boolean hasTiePoints()
```
    Tells me if the underlying IIOMetadata contains ModelTiepointTag tag for TiePoint.
    
    Returns:
    
    true if ModelTiepointTag is present, false otherwise.
  - hasPixelScales
```
public boolean hasPixelScales()
```
    Tells me if the underlying IIOMetadata contains ModelTiepointTag tag for TiePoint.
    
    Returns:
    
    true if ModelTiepointTag is present, false otherwise.
  - hasNoData
```
public boolean hasNoData()
```
    Tells me if the underlying IIOMetadata contains NoData Tag.
    
    Returns:
    
    true if NoData Tag is present, false otherwise.
    
    See Also:
    
    GeoTiffConstants.TIFFTAG_NODATA
  - getModelTransformation
```
public AffineTransform getModelTransformation()
```
    Gets the model tie points from the appropriate TIFFField
    Attention, for the moment we support only 2D baseline transformations.
    
    Returns:
    
    the transformation, or null if not found
  - hasModelTrasformation
```
public boolean hasModelTrasformation()
```
    Tells me if the underlying IIOMetadata contains ModelTransformationTag tag for AffineTransform that map from Raster Space to World Space.
    
    Returns:
    
    true if ModelTransformationTag is present, false otherwise.
  - getRootNode
```
public IIOMetadataNode getRootNode()
```
  - hasGeoKey
```
public boolean hasGeoKey()
```
    Return true if the geokey directory is present, false otherwise. In case no geokey dir is present no CRS can be constructed from this set of metadata.
    A prj can be used otherwise.
    
    Returns:
    
    true if the geokey directory is present, false otherwise.
  - getAsciiTIFFTag
```
public String getAsciiTIFFTag(String tagID)
```
    Returns the value of an ASCII TIFFTag referred by tagID.
    
    Returns:
    
    the tag value as a String, null if not available.

Class GeoTiffIIOMetadataDecoder

Constructor Summary

Method Summary

Methods inherited from class Object

Constructor Detail

GeoTiffIIOMetadataDecoder

Method Detail

getGeoKeyDirectoryVersion

getGeoKeyRevision

getGeoKeyMinorRevision

getNumGeoKeys

getGeoKey

getGeoKeyRecord

getGeoKeys

getModelPixelScales

getModelTiePoints

getNoData

hasTiePoints

hasPixelScales

hasNoData

getModelTransformation

hasModelTrasformation

getRootNode

hasGeoKey

getAsciiTIFFTag