OSSIM (inside DiapOTB)

Currently, several actions are initiated to remove Ossim plugin from OTB. The following issue (orfeotoolbox/otb#1506 (closed)) describes these developments.

DiapOTB uses Ossim across some OTB classes and also directly Ossim objects.

Inside OTB, the main dependencies at Ossim used by DiapOTB are :

• DEMHandler (See 9c4036d2)
• OssimSarSensorModel and other sensors such as ossimCosmoSkymedModel or ossimSentinel1Model
• SarSensorModelAdapter

These classes handle projection and metadata for SAR Sensor.

Besides, some ossim functions/objects are directly included into DiapOTB code. These functions/objects are :

• For keywordlist
• For time conversion with ossimTimeUtilities (ModifiedJulianDay, Duration)
• For specific DEM hander : ossimGeoidEgm96
• For coordinates conversion (ie. Gpt <-> Ecef)

ossim function/objects are included for the followings files :

• app/otbSARFineMetadata.cxx : Legacy (deleted soon)

  • ossimplugins::time::ModifiedJulianDate, ossimplugins::time::Duration, ossimplugins::time::seconds, ossimplugins::time::toModifiedJulianDate :
    • Aim: Use to handle dates and make estimations (inspired of ossimplugins::ossimSarSensorModel)
    • Solution: Can be replaced by std::get_time (I think) into DiapOTB or maybe generic into OTB ?

• app/otbSARMetadataCorrection.cxx :

  • ossimplugins::time::ModifiedJulianDate, ossimplugins::time::Duration, ossimplugins::time::seconds, ossimplugins::time::toModifiedJulianDate :
    • Aim: Use to handle dates and make estimations (inspired of ossimplugins::ossimSarSensorModel)
    • Solution: Can be replaced by std::get_time (I think) into DiapOTB or maybe generic into OTB ?

• include/otbSARDEMProjectionImageFilter.h/txx :

  • ossimGeoidEgm96 :
    • Aim: to specify a egm96 geoid as input (improve performance for that case)
    • Solution: See into GDAL ? (depends on DEMHandler chgts)
  • ossimFilename :
    • Get Geoid file for ossimGeoidEgm96 constructor
    • Solution: See into GDAL ? (depends on DEMHandler chgts)
  • ossimGpt :
    • Aim : Use as input for offsetFromEllipsoid function from ossimGeoidEgm96
    • Solution: See into GDAL ? (depends on DEMHandler chgts)

• include/otbSARDerampImageFilter.h/txx :

  • ossimplugins::time::ModifiedJulianDate, ossimplugins::time::Duration, ossimplugins::time::seconds, ossimplugins::time::toModifiedJulianDate :
    • Aim: Use to handle dates and make estimations/comparisons (inspired of ossimplugins::ossimSarSensorModel)
    • Solution: Can be replaced by std::get_time (I think) into DiapOTB or maybe generic into OTB ?

• include/otbSARDopplerCentroidFreqImageFilter.h/txx :

  • ossimplugins::time::ModifiedJulianDate, ossimplugins::time::Duration, ossimplugins::time::seconds, ossimplugins::time::toModifiedJulianDate :
    • Aim: Use to handle dates and make estimations/comparisons (inspired of ossimplugins::ossimSarSensorModel)
    • Solution: Can be replaced by std::get_time (I think) into DiapOTB or maybe generic into OTB ?

• include/otbSARGroupedByOrthoImageFilter.h/txx : Legacy (deleted soon)

  • ossimGeoidEgm96 :
    • Aim: to specify a egm96 geoid as input (improve performance for that case)
    • Solution: See into GDAL ? (depends on DEMHandler chgts)
  • ossimGpt :
    • Aim : Use as input for offsetFromEllipsoid function from ossimGeoidEgm96
    • Solution: See into GDAL ? (depends of DEMHandler chgts)
  • ossimFilename :
    • Get Geoid file for ossimGeoidEgm96 constructor
    • Solution: See into GDAL ? (depends on DEMHandler chgts)
  • Constructors ossimGpt and ossimEcefPoint :
    • Aim : Convert Ecef point to Gpt
    • Solution : Create into otb ::SarSensorModelAdapter a function CartesianToWorld (just like WorldToCartesian)