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- """
- GDAL - Constant definitions
- """
- from ctypes import (
- c_double, c_float, c_int16, c_int32, c_ubyte, c_uint16, c_uint32,
- )
-
- # See https://www.gdal.org/gdal_8h.html#a22e22ce0a55036a96f652765793fb7a4
- GDAL_PIXEL_TYPES = {
- 0: 'GDT_Unknown', # Unknown or unspecified type
- 1: 'GDT_Byte', # Eight bit unsigned integer
- 2: 'GDT_UInt16', # Sixteen bit unsigned integer
- 3: 'GDT_Int16', # Sixteen bit signed integer
- 4: 'GDT_UInt32', # Thirty-two bit unsigned integer
- 5: 'GDT_Int32', # Thirty-two bit signed integer
- 6: 'GDT_Float32', # Thirty-two bit floating point
- 7: 'GDT_Float64', # Sixty-four bit floating point
- 8: 'GDT_CInt16', # Complex Int16
- 9: 'GDT_CInt32', # Complex Int32
- 10: 'GDT_CFloat32', # Complex Float32
- 11: 'GDT_CFloat64', # Complex Float64
- }
-
- # A list of gdal datatypes that are integers.
- GDAL_INTEGER_TYPES = [1, 2, 3, 4, 5]
-
- # Lookup values to convert GDAL pixel type indices into ctypes objects.
- # The GDAL band-io works with ctypes arrays to hold data to be written
- # or to hold the space for data to be read into. The lookup below helps
- # selecting the right ctypes object for a given gdal pixel type.
- GDAL_TO_CTYPES = [
- None, c_ubyte, c_uint16, c_int16, c_uint32, c_int32,
- c_float, c_double, None, None, None, None
- ]
-
- # List of resampling algorithms that can be used to warp a GDALRaster.
- GDAL_RESAMPLE_ALGORITHMS = {
- 'NearestNeighbour': 0,
- 'Bilinear': 1,
- 'Cubic': 2,
- 'CubicSpline': 3,
- 'Lanczos': 4,
- 'Average': 5,
- 'Mode': 6,
- }
-
- # See https://www.gdal.org/gdal_8h.html#ace76452d94514561fffa8ea1d2a5968c
- GDAL_COLOR_TYPES = {
- 0: 'GCI_Undefined', # Undefined, default value, i.e. not known
- 1: 'GCI_GrayIndex', # Greyscale
- 2: 'GCI_PaletteIndex', # Paletted
- 3: 'GCI_RedBand', # Red band of RGBA image
- 4: 'GCI_GreenBand', # Green band of RGBA image
- 5: 'GCI_BlueBand', # Blue band of RGBA image
- 6: 'GCI_AlphaBand', # Alpha (0=transparent, 255=opaque)
- 7: 'GCI_HueBand', # Hue band of HLS image
- 8: 'GCI_SaturationBand', # Saturation band of HLS image
- 9: 'GCI_LightnessBand', # Lightness band of HLS image
- 10: 'GCI_CyanBand', # Cyan band of CMYK image
- 11: 'GCI_MagentaBand', # Magenta band of CMYK image
- 12: 'GCI_YellowBand', # Yellow band of CMYK image
- 13: 'GCI_BlackBand', # Black band of CMLY image
- 14: 'GCI_YCbCr_YBand', # Y Luminance
- 15: 'GCI_YCbCr_CbBand', # Cb Chroma
- 16: 'GCI_YCbCr_CrBand', # Cr Chroma, also GCI_Max
- }
-
- # Fixed base path for buffer-based GDAL in-memory files.
- VSI_FILESYSTEM_BASE_PATH = '/vsimem/'
-
- # Should the memory file system take ownership of the buffer, freeing it when
- # the file is deleted? (No, GDALRaster.__del__() will delete the buffer.)
- VSI_TAKE_BUFFER_OWNERSHIP = False
-
- # Should a VSI file be removed when retrieving its buffer?
- VSI_DELETE_BUFFER_ON_READ = False
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