org.geotools.referencing.operation.builder

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.referencing.operation.builder 
org.geotools.referencing.operation.builder
package org.geotools.referencing.operation.builder

A package of convenience classes which use control points common to two data sets to derive empirically the transformation parameters needed to convert positions between the coordinate systems of the two data sets.

Note the implementation is currently (January 2008) limited to two dimensions. The methods, however, are generic and could be expanded to three dimensions someday. At that time, we will probably make minor changes to the API.

The package consists of two types of convenience classes: the various builder classes which use a set of individual control points to obtain the conversion and the GridToEnvelopeMapper class which derives the conversion from a grid range to a georeferenced Envelope.

The builder classes should be used by users who have two data sets that are known to share certain common points but who currently do not line up. This could be the case, for example, if a user has two data sets describing the same region but one of these has an unknown coordinate referencing system. In this situation, there is no way to convert coordinate positions between the two data sets. However, if the user can identify a series of positions coupled in each data set, a Builder can calculate an empirical conversion between the two data sets. The different Builder classes use different mathematical approaches to obtain the empirical estimate.

The GridToEnvelopeMapper should be used by users who have a grid, such as an image, which is not georeferenced but the user knows the grid is aligned in one of the four cardinal directions and the user can identify the outer georeferenced envelope of the grid. The Mapper class can then calculate an empirical conversion object to map positions in the image coordinate system to georeferenced positions.

The builder classes require a matched set of known positions, one from a "source" data set and another from a "target" data set; the builder will then provide a structure which contains a conversion object to transform positions from the "source" coordinate system to the "target" coordinate system. The builders require a list of {@linkplain org.geotools.referencing.operation.builder.MappedPosition MappedPosition} objects which are associations of a {@linkplain org.opengis.referencing.DirectPosition DirectPosition} in the "source" data set with another DirectPosition in the "target" data set. The {@linkplain org.geotools.referencing.operation.builder.MathTransformBuilder#getTransformation() getTransformation() method} in the builder can then be used to provide a {@linkplain org.opengis.referencing.operation.Transformation Transformation} object from which the user can obtain the {@linkplain org.opengis.referencing.operation.MathTransform MathTransform} to use for conversion operations.

Different builders use different mathematical approaches for obtaining the empirical estimate of the conversion parameters. The builders are:

  • {@linkplain org.geotools.referencing.operation.builder.ProjectiveTransformBuilder ProjectiveTransformBuilder}
  • {@linkplain org.geotools.referencing.operation.builder.AffineTransformBuilder AffineTransformBuilder}
  • {@linkplain org.geotools.referencing.operation.builder.SimilarTransformBuilder SimilarTransformBuilder}
  • {@linkplain org.geotools.referencing.operation.builder.BursaWolfTransformBuilder BursaWolfTransformBuilder}
  • {@linkplain org.geotools.referencing.operation.builder.RubberSheetBuilder RubberSheetBuilder}
with the mathematical details of each estimation procedure explained in the documentation of the builder class itself. The first four of these use a least squares estimation method in which, if the system is over-determined by having more than the minimum number of control points necessary to derive the estimate, the best matching parameter estimate will be obtained by minimising the sum of the squared distances to the points. The RubberSheet algorithm uses a linear interpolation between the various control points.

Java Source File NameTypeComment
AffineTransformBuilder.javaClass Builds setup as Affine transformation from a list of .
BursaWolfTransformBuilder.javaClass Builds setup as BursaWolf transformation from a list of . The calculation uses least square method.
BursaWolfTransformBuilderTest.javaClass
Circle.javaClass Simple Circle focused on Delaunays triangulation.
ExtendedPosition.javaClass DirectPosition associated with another DirectPosition.
GridToEnvelopeMapper.javaClass A helper class for building n-dimensional mapping to .
GridToEnvelopeMapperTest.javaClass Tests GridToEnvelopeMapper .
LocalizationGrid.javaClass A factory for MathTransform2D backed by a grid of localization. A grid of localization is a two-dimensional array of coordinate points.
LocalizationGridTransform2D.javaClass Transform a set of coordinate points using a grid of localization. Input coordinates are index in this two-dimensional array. Those input coordinates (or index) should be in the range xinput = [0..width-1] and yinput = [0..height-1] inclusive, where width and height are the number of columns and rows in the grid of localization.
MappedPosition.javaClass An association between a and direct positions.
MapTriangulationFactory.javaClass Implements methods for triangulation for transformation.
MathTransformBuilder.javaClass Provides a basic implementation for builders. Math transform builders create MathTransform objects for transforming coordinates from a source CRS ( ) to a target CRS using empirical parameters.
MathTransformBuilderTest.javaClass A test for the MathTransformBuilders.
MissingInfoException.javaClass Thrown when a required operation can't be performed because some information is missing or isn't set up properly.
Polygon.javaClass Simple polygons like three - sided (triangle) or four - sided (qadrilateral), that are used for triangulation.
ProjectiveTransformBuilder.javaClass Builds setup as Projective transformation from a list of .
Quadrilateral.javaClass A simple four-sided polygon.
RubberSheetBuilder.javaClass Builds a RubberSheet transformation from a set of control points, defined as a List of objects, and a quadrilateral delimiting the outer area of interest, defined as a List of four objects.
RubberSheetTransform.javaClass This provides the transformation method based on RubberSheeting (also known as Billinear interpolated transformation) The class is accessed .
SimilarTransformBuilder.javaClass Builds setup as Similar transformation from a list of . The The calculation uses least square method.
TINTriangle.javaClass A triangle, with special methods for use with RubberSheetTransform.
TriangulationException.javaClass Thrown when it is unable to generate TIN.
TriangulationFactory.javaClass Generates TIN with respect to delaunay criterion.
TriangulationFactoryTest.javaClass
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.