GitLab

Sub-issue of #1506.

The metadata in OTB will be refactored in order to allow OSSIM removal.

The following macro-actions should be done:

• Define the basic struct to store metadata (ImageMetadata)
• Setup utility functions in GDALImageIO to efficiently retrieve metadata (dates, doubles, vectors,...)
• Implement metadata parsing into each sensor IMI
  • DIMAP ? for the PHR/S6/S7 family
  • DigitalGlobe ? for QB, WorldView, ...
  • Sentinel1
• Save ImageMetadata through GDALImageIO
• Load ImageMetadata from GDALImageIO2024-metadata-refac
• Translate OSSIM Keywordlist into ImageMetadata

In order to implement progressively the new metadata model into the OTB, the work will be decomposed in 5 steps:

1. Metadata parsing for Pleiades: implement all the required classes and method necessary to handle Pleiades metadata (Optical sensor).
2. Metadata parsing for Sentinel 1: implement all the required classes and method necessary to handle Sentinel-1 metadata (SAR sensor).
3. Implements all the other SAR metadata interfaces: TerraSar, CosmoImage, Radarsat2.
4. Implements all the other optical metadata interfaces: Ikonos, WorldView2, QuickBird, Spot, Spot6 and Formosat.
5. Implements metadata utility functionalities: import/export...

Here is a detailed description of remaining work per step and per-class:

1. Metadata parsing for Pleiades
   • Metadata
     • class ImageMetadataBase
       • ToKeywordlist: handle Geometry keys
       • ToKeywordlist: handle LUT1D keys
       • ToKeywordlist: handle LUT2D keys
       • FromKeywordlist
     • class ImageMetadata
       • slice
       • append
     • class OpticalImageMetadataInterface
       • ConvertImageKeywordlistToImageMetadata
     • MetaDataInterface implementation:
       • DimapMetadataInterface: Pleiades
     • class MetadataStorageInterface
       • TODO: check precision settings
       • TODO: check if we can use lexical_cast on a string_view
   • ImageBase
     • class Image
       • GenericRSTransform should be instanciated to translate from physical space to EPSG:4328
     • class VectorImage
       • GenericRSTransform should be instanciated to translate from physical space to EPSG:4328
     • class ImageCommons
       • Move back GetGeotransform to otb::Image and otb::VectorImage
       • Move back the GetCorners to otb::Image and otb::VectorImage, and return coordinates, in physical space, adapt usages of these function to add a GenericRSTranform to get WGS84 coords.
       • TODO: support EPSG and proj as fallback
   • IOGDAL
     • class GDALImageIO
       • ExportMetadata
       • ImportMetadata
       • Implement test ioTvGDALImageIOImportExportMetadata_JPEG_99
2. Metadata parsing for Sentinel 1
   • Metadata
     • class SARImageMetadataInterface
       • ConvertImageKeywordlistToImageMetadata
     • MetaDataInterface implementation:
       • SAR IMI: Sentinel1
3. Other SAR metadata interfaces
   • Metadata
     • MetaDataInterface implementation:
       • SAR IMI: TerraSar
       • SAR IMI: CosmoSkyMed
       • SAR IMI: Radarsat2
4. Other optical metadata interfaces
   • Metadata
     • MetaDataInterface implementation:
       • DimapMetadataInterface: Spot, Formosat, (S6, S7)
       • DGMetadataInterface: QB, Worldview
       • IkonosMetadataInterface
       • Read optical metadata from geom
5. Metadata utility functionalities
   • Metadata
     • class ImageMetadata
       • compact
       • merge
       • Use merge in otbImageMetadataInterfaceFactory.h to avoid Imd duplication
       • Update ChangeInformationImageFilter and it's test
   • Band metadata management : Manage pixel conversion (e.g. RGB->Grayscale, Vector->complex etc) * [ ] Implement specific behavior in image manipulation filters (extractROI etc..)
   • No data Use otb::ImageMetadata instead of itk::MetaDataDictionary when using ND in filters
   • OSSIMAdapters
     • class ImageKeywordlist
       • ReadGeometry
       • WriteGeometry
   • ImageFileReader
     • TODO: disable when Ossim removed
     • TODO: define proper behavior in this case