File: CHANGELOG.txt

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           CHANGELOG for the EPR-API, VERSION 2.3


----------------------------------------------------------------------
Changes from Version 2.2 to Version 2.3 (of DD. MMMM YYYY)
----------------------------------------------------------------------
Bugfix in epr_band.c: [EPR-7] Interpolation of geolocation ADS
Bugfix in epr_core.c: Setting errno to 0 in method epr_str_to_number.

----------------------------------------------------------------------
Changes from Version 2.1 to Version 2.2 (of 31. July 2010)
----------------------------------------------------------------------
Generally replaced usage of data type "long" by "int" since "long" is 
ambiguous with respect to 32bit and 64bit operating systems.

----------------------------------------------------------------------
Changes from Version 2.0.5 to Version 2.1 (of 6. May 2009)
----------------------------------------------------------------------
Support of MER_FRS (full resulution full swath) products
Support of IODD7

----------------------------------------------------------------------
Changes from Version 2.0.4 to Version 2.0.5 (of 28. October 2004)
----------------------------------------------------------------------
Bugfix in file epr_bitmask.c:
If function epr_read_bitmask_raster() was called with non-zero pixel
offsets, the application crashed due to an invalid array index
exception.

----------------------------------------------------------------------
Changes from Version 2.0.3 to Version 2.0.4 (of 23. June 2004)
----------------------------------------------------------------------
Support for updated MERIS RR/FR Level 2 product format
Backward compatibility with older formats is ensured.
The new product changes are:
    a) the band "aero_epsilon" has been replaced by "aero_alpha".
    b) new flags have been added:
       BLUE_AERO  - Aerosol with high Angstrom Exponent
                    selected for atmosphere correction
       BPAC_ON    - Bright Pixels Atm. Correction activated (water)
       LOW_SUN    - Sun low above horizon (or conversely
                    high Sun zenith angle)
    c) The DDV flag is now exclusively evaluated above land (LAND=true)

----------------------------------------------------------------------
Changes from Version 2.0.2 to Version 2.0.3 (of 5. Nov 2003)
----------------------------------------------------------------------
Bugfix in file epr_band.c:
In function epr_read_band_raster() an error occured if the percentage
of raster->source_step_x is bigger than raster->raster_width.
This restriction was removed.

----------------------------------------------------------------------
Changes from Version 2.0.1 to Version 2.0.2 (of 21. June 2003)
----------------------------------------------------------------------
1) Bugfix: MERIS L1b flags now correcly read (read_measurement_...
   "unknown data type")
2) Bugfix: MERIS L2 flags now correcly read (wrong byte order)
3) Bugfix: MER_RRC_1P products now correctly handled
4) Support for MERIS, AATSR and ASAR child products added
5) Support for new MERIS L2 TOAVI flags included ...
6) New utility functions for geophysical raster data access have been
   added to the API:
        o epr_get_raster_elem_size
        o epr_get_raster_elem_addr
        o epr_get_raster_pixel_addr
        o epr_get_raster_line_addr
7) New utility functions have been added to the API:
        o epr_get_data_type_size
        o epr_data_type_id_to_str

----------------------------------------------------------------------
Changes from Version 2.0 to Version 2.0.1 (of 21.03.2003)
----------------------------------------------------------------------
Bugfix: The build-in support for older MERIS L1b/L2 products (IODD 5)
caused that no other product types than MERIS L1b/L2 data products could
be opened. The error message was "epr_create_band_ids: band not found".
Now also the other MERIS, AATSR and ASAR products can be opened again.

----------------------------------------------------------------------
Changes from Version 1.4 to Version 2.0 (of 07.03.2003)
----------------------------------------------------------------------
1) The operational ENVISAT MERIS Level 1b product format has slightly
   changed. The 'spectral shift index' has been replaced by a 'detector
   index' according to IODD 6.0 (PO-TN-MEL-GS-0003).
   The older format is still supported by the EPR-API.
2) The DDDB as such has been removed and merged into the files
   'epr_dddb.c'and 'epr_dddb.h'. This makes it unnecessary to pass the
   DDDB path to epr_init_api().
   The API therefore has become easier to maintain.
3) The computation of geolocation has been improved and adapted to the
   VISAT precision.

----------------------------------------------------------------------
Changes from Version 1.3 to Version 1.4
----------------------------------------------------------------------
Support for ENVISAT ASAR data products added

----------------------------------------------------------------------
Changes from Version 1.2 to Version 1.3
----------------------------------------------------------------------
1) Function epr_get_field_elem_as_mjd has been changed, it has now only
   one parameter left:
   const EPR_STime* epr_get_field_elem_as_mjd(const EPR_SField* field)
2) Getter functions for dataset descriptions have been added to the API
     - epr_get_num_dsds
     - epr_get_dsd_at

----------------------------------------------------------------------
Changes from Version 1.1 to Version 1.2
----------------------------------------------------------------------
1) All functions defined in "epr_api.h" now properly return exeptional
   values in case of an error.
2) Some of the API function did not clear the internal API error state.
   All public API functions now clear the global error state before
   the execute their actual code.

----------------------------------------------------------------------
Changes from Version 1.0 to Version 1.1
----------------------------------------------------------------------
1) The 'epr_open_product' function now creates automatically all dataset
   and band identifiers found in a given ENVISAT product file.
   That means, the user must not take care of the memory de-allocation of these
   identifiers; this will automatically be done when the 'epr_close_product'
   function is called.
2) In addition eight functions have been implemented. Their purpose is to ease
   the work with dataset and band identifiers.
   The new functions are listed below.
3) The "epr_dataset.h" header-file has been added.
4) New functions have been added:

   /* Gets the number off all datasets contained in a product. */
   uint epr_get_num_datasets(EPR_SProductId* product_id);

   /* Gets the dataset_id at the specified position within the product. */
   EPR_SDatasetId* epr_get_dataset_id_at(EPR_SProductId* product_id, uint index);

   /* Gets the dataset_id coresponding to the specified dataset name. */
   EPR_SDatasetId* epr_get_dataset_id(EPR_SProductId* product_id, const char* dataset_name);

   /* Gets the name of the dataset for the given dataset ID. */
   const char* epr_get_dataset_name(EPR_SDatasetId* dataset_id);


   /* Gets the number off all bands contained in a product. */
   uint epr_get_num_bands(EPR_SProductId* product_id);

   /* Gets the band_id at the specified position within the product. */
   EPR_SBandId* epr_get_band_id_at(EPR_SProductId* product_id, uint index);

   /* Gets the band_id corresponding to the specified name. */
   EPR_SBandId* epr_get_band_id(EPR_SProductId* product_id, const char* band_name);

   /* Gets the name of the band for the given dataset ID. */
   char* epr_get_band_name(EPR_SBandId* band_id);

5) Some functions have been deprecated:

   'epr_create_dataset_id' is no longer part of the public API.
   Please use 'epr_get_dataset_id' instead.

   'epr_free_dataset_id' is no longer part of the public API.
   The dataset IDs retrieved with the 'epr_get_dataset_id' function
   do not require an explicite destruction.


   'epr_band_dataset_id' is no longer part of the public API.
   Please use 'epr_get_band_id' instead.

   'epr_free_band_id' is no longer part of the public API.
   The dataset IDs retrieved with the 'epr_get_band_id' function
   do not require an explicite destruction.