rl2tiff changes

Changes made in rl2tiff.c

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[<-- 'Index Page for RasterLite2 - Commands'] (RasterLite2-Index#commands)

[<-- 'Cutline / RasterDefaults Index'] (Cutline-Index#code_changes)

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• init_tiff_origin
  • in cases where TIFFGetFieldDefaulted
    • will return (without a need to check the return code) a default value
      • TIFFGetField was replaced with TIFFGetFieldDefaulted
  • otherwise
    • TIFFGetField with the checking of the return code is used

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• TIFFTAG_GDAL_NODATA
  • User/ Custom defined TIFFTAG support has been added
    • this enables the use of
      • TIFFGetField and TIFFSetField
  • a read and write function has been created
    • to translate a GDAL_NODATA to a RL2-NODATA
      • fetch_gdal_nodata
        • reads a rl2PixelPtr and fills a string with the found value
          • used when creating a GeoTiff with TIFFTAG_GDAL_NODATA
      • rl2_set_gdal_nodata
        • creates a rl2PixelPtr from a string received from TIFFTAG_GDAL_NODATA
          • which can be used to set the raster_coverage nodata value
            • each band receives the same value
    • a major difference between the 2 is
      • that a GDAL-NODATA is use for all bands
      • where as RL2-NODATA can have a different value for each
        • the functions above insure
          • that these rules are applied

Note:

• to insure, that during RL2_LoadRaster
  • a User-defined nodata in never overwritten by a found TIFFTAG_GDAL_NODATA
    • rl2sqlaux.c *default_nodata
      • will set the Pixels as Transparent (isTransparent == 1)
        • isTransparent is otherwise (for a nodata pixel) not used
    • rl2import.c do_import_file
      • set_coverage_nodata will only be called
        • when the existing raster_coverage nodata has (isTransparent == 1)

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• DOCUMENTNAME

  • will be read and used as title

• IMAGEDESCRIPTION

  • will be read and used as abstract

• COPYRIGHT

  • will be read and used as copyright
    • but will not be saved until a decision has been made
      • to add such a field to raster_coverages

• rl2import.c do_import_file

  • set_coverage_infos will only be called
    • if the existing title and abstract
      • have not already be set by the User
        • value empty or '*** missing ... ***'

Goal:

• is to simplify the import process

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[<-- 'Cutline / RasterDefaults Index'] (Cutline-Index#code_changes)

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2015-11-12: Mark Johnson, Berlin Germany

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