The collection of GeoKeys used when reading and writing Geo TIFF files.
public ObservableCollection<RasterTagMetadata> GeoKeys { get; }
Public ReadOnly Property GeoKeys As ObservableCollection(Of RasterTagMetadata)
@property (nonatomic, assign, readonly, nullable) NSMutableArray<LTRasterTagMetadata *> *geoKeys;
public List<RasterTagMetadata> getGeoKeys()
public:
property ObservableCollection<RasterTagMetadata^>^ GeoKeys {
ObservableCollection<RasterTagMetadata^>^ get();
}
A collection of RasterTagMetadata GeoKeys used when reading and writing Geo TIFF files.
GeoTIFF files are TIFF files containing a few extra TIFF tags describing the image location, scale at which the picture was taken and many other information useful for topographic applications.
Any GeoTIFF file that you save will include the GeoKey data set until you clear the GeoKey data. To save this data to a file, save RasterImageFormat.GeoTiff files.
For more information, refer to Implementing GeoKeys (GeoTIFF tags).
To write the GeoKey data directly to an existing file, call RasterCodecs.WriteGeoKey. Note that LEADTOOLS does not verify the validity of the GeoKeys that you set. It is your responsibility to make sure you write correct values according to the GeoTIFF specification.
You can manipulate the GeoKeys of an image by adding/removing RasterTagMetadata objects to this collection.
By setting the CodecsSaveOptions.GeoKeys property to true before calling RasterCodecs.Save, you can save the GeoKeys in this collection when the image is saved into a file.
By setting the CodecsLoadOptions.Markers property to true before calling RasterCodecs.Load, you can load all the markers (if any) into this collection when an image is loaded from a file.
You can use the RasterCodecs.WriteGeoKeys method to save GeoKeys tags directly to an existing file and the RasterCodecs.EnumGeoKeys to load the GeoKeys stored in an existing file.
For more information on GeoKeys, refer to Implementing GeoKeys (GeoTIFF tags).
For more information, refer to Non Image Data.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using LeadtoolsExamples.Common;
using Leadtools.Svg;
private void DisplayGeoKey(RasterTagMetadata key)
{
switch (key.DataType)
{
case RasterTagMetadataDataType.Ascii:
MessageBox.Show("Key " + key.Id.ToString() + " = " + key.ToAscii());
break;
case RasterTagMetadataDataType.Byte:
MessageBox.Show("Key " + key.Id.ToString() + " = " + key.ToByte()[0].ToString());
break;
}
}
public void GeoKeysExample()
{
RasterCodecs codecs = new RasterCodecs();
RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE1.CMP"));
// Ascii
RasterTagMetadata keyDataAscii = new RasterTagMetadata();
// set the GTCitationGeoKey key, for more info, refer to the Geo TIFF spec.
keyDataAscii.Id = 1026;
keyDataAscii.DataType = RasterTagMetadataDataType.Ascii;
keyDataAscii.FromAscii("Test String");
image.GeoKeys.Add(keyDataAscii);
codecs.Options.Save.GeoKeys = true;
codecs.Save(image, Path.Combine(ImagesPath.Path, "IMAGE1_GEOKEY.TIF"), RasterImageFormat.GeoTiff, 0);
// load the GeoKeys together with the image
RasterTagMetadata key = codecs.ReadGeoKey(Path.Combine(ImagesPath.Path, "IMAGE1_GEOKEY.TIF"), 1, keyDataAscii.Id);
DisplayGeoKey(key);
codecs.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg
Private Sub DisplayGeoKey(ByVal key As RasterTagMetadata)
Select Case key.DataType
Case RasterTagMetadataDataType.Ascii
MessageBox.Show("Key " & key.Id.ToString() & " = " & key.ToAscii())
Case RasterTagMetadataDataType.Byte
MessageBox.Show("Key " & key.Id.ToString() & " = " & key.ToByte()(0).ToString())
End Select
End Sub
Public Sub GeoKeysExample()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP"))
' Ascii
Dim keyDataAscii As RasterTagMetadata = New RasterTagMetadata()
' set the GTCitationGeoKey key, for more info, refer to the Geo TIFF spec.
keyDataAscii.Id = 1026
keyDataAscii.DataType = RasterTagMetadataDataType.Ascii
keyDataAscii.FromAscii("Test String")
image.GeoKeys.Add(keyDataAscii)
codecs.Options.Save.GeoKeys = True
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_GEOKEY.TIF"), RasterImageFormat.GeoTiff, 0)
' load the GeoKeys together with the image
Dim key As RasterTagMetadata = codecs.ReadGeoKey(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_GEOKEY.TIF"), 1, keyDataAscii.Id)
DisplayGeoKey(key)
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;
private void DisplayGeoKey(RasterTagMetadata key)
{
switch (key.DataType)
{
case RasterTagMetadataDataType.Ascii:
Debug.WriteLine("Key " + key.Id.ToString() + " = " + key.ToAscii());
break;
case RasterTagMetadataDataType.Byte:
Debug.WriteLine("Key " + key.Id.ToString() + " = " + key.ToByte()[0].ToString());
break;
}
}
public void GeoKeysExample(RasterImage image, Stream destStream)
{
// Ascii
RasterTagMetadata keyDataAscii = new RasterTagMetadata();
// set the GTCitationGeoKey key, for more info, refer to the Geo TIFF spec.
keyDataAscii.Id = 1026;
keyDataAscii.DataType = RasterTagMetadataDataType.Ascii;
keyDataAscii.FromAscii("Test String");
image.GeoKeys.Add(keyDataAscii);
RasterCodecs codecs = new RasterCodecs();
codecs.Options.Save.GeoKeys = true;
codecs.Save(image, destStream, RasterImageFormat.GeoTiff, 0);
// load the GeoKeys together with the image
RasterTagMetadata key = codecs.ReadGeoKey(destStream, 1, keyDataAscii.Id);
DisplayGeoKey(key);
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media
Private Sub DisplayGeoKey(ByVal key As RasterTagMetadata)
Select Case key.DataType
Case RasterTagMetadataDataType.Ascii
Debug.WriteLine("Key " & key.Id.ToString() & " = " & key.ToAscii())
Case RasterTagMetadataDataType.Byte
Debug.WriteLine("Key " & key.Id.ToString() & " = " & key.ToByte()(0).ToString())
End Select
End Sub
Public Sub GeoKeysExample(ByVal image As RasterImage, ByVal destStream As Stream)
' Ascii
Dim keyDataAscii As RasterTagMetadata = New RasterTagMetadata()
' set the GTCitationGeoKey key, for more info, refer to the Geo TIFF spec.
keyDataAscii.Id = 1026
keyDataAscii.DataType = RasterTagMetadataDataType.Ascii
keyDataAscii.FromAscii("Test String")
image.GeoKeys.Add(keyDataAscii)
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.Options.Save.GeoKeys = True
codecs.Save(image, destStream, RasterImageFormat.GeoTiff, 0)
' load the GeoKeys together with the image
Dim key As RasterTagMetadata = codecs.ReadGeoKey(destStream, 1, keyDataAscii.Id)
DisplayGeoKey(key)
End Sub
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