The Metadata Access Services retrieve or modify desired metadata, converting its format when needed.
3.9.2. Service Subtypes
Services in this category include, but are not limited to, the following: 3.9.2.1. Image geometry model metadata access service
3.9.2.2. Spatial reference system SRS metadata access service 3.9.2.3. Coordinate transformation metadata access service
3.9.2.4. Image format metadata access service 3.9.2.5. Values of pixels metadata access service
3.9.2.6. Service capabilities metadata access service 3.9.2.7. Service properties or strategies metadata access service
3.9.2.8. Support Metadata Retrieval Services 3.9.2.8.1.
Result Data: 1. Metadata or service using metadata is metadata
3.9.2.8.2. Needed Data:
1. Image or dataset identification is metadata for dataset 2. Selection of desired metadata or of service using metadata
3. Selection of desired metadata format 3.9.2.9. Support Metadata Modification Services
3.9.2.9.1. Result Data:
1. Success or failure of metadata modifications 3.9.2.9.2.
Needed Data: 1. Modified metadata or service having modified metadata
2. Image or dataset identification is metadata for dataset 3. Specification of input metadata format is part of metadata?
4. Selection of metadata to be modified
3.9.3. Discussion
Technical Note: Services 3.9.2.8 and 3.9.2.9 are alternatives to the preceding services that combine Metadata Access Services with the services that use each type of metadata.
Metadata retrieval and modification services have different interfaces, as outlined above, although they might be implemented as different operations of a single service.
3.10. Image Geometry Model Transformation Services
3.10.1. Function
The Image Geometry Model Transformation Services produce a different geometry model for an image, or metadata for a different image geometry model.
3.10.2. Consequences
There are many different possible geometry models for an image, with different properties. For example, a rigorous geometry model can be accurately adjusted see Section 2.5, but has high
computation requirements. On the other hand, a “real-time” geometry model has lesser computation requirements, but cannot be accurately adjusted. Transformation from a rigorous geometry model
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to a corresponding “real-time” geometry model is then sometimes required. Transformation from a “real-time” geometry model to a rigorous geometry model is usually not possible or practical.
These Image Geometry Model Transformation Services are described here because they are similar to Metadata Access Services. These Image Geometry Model Transformation Services support the
Image Coordinate Transformation Services. However, these Image Geometry Model Transformation Services have significantly different interfaces.
3.10.3. Service Subtypes
Services in this category include, but are not limited to, the following: 3.10.3.1. Fit approximate image geometry model to point positions computed using existing image
geometry model 3.10.3.2. Convert image geometry model to different, mathematically equivalent model, by converting
geometry parameters of existing image geometry model
3.10.4. Results Data
The data resulting from these services output data includes, but are not limited to: 1. New image geometry model, for entire image or selected section of image is modified metadata
for image 2. Metadata for new image geometry model, including:
2.1. Absolute accuracy estimates for new model is metadata for new model 2.2. Relative accuracy estimates for new model is metadata for new model
2.3. Modified image SRS definition is metadata for new model 2.4. Identification of applicable image section is metadata for new model
2.5. Model fitting error estimates is metadata for new model Technical Note: These services should always return result metadata to client software result
metadata is not optional.
3.10.5. Needed data
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