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