88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
"""
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GDAL - Constant definitions
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"""
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from ctypes import c_double, c_float, c_int16, c_int32, c_ubyte, c_uint16, c_uint32
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# See https://gdal.org/api/raster_c_api.html#_CPPv412GDALDataType
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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,
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c_ubyte,
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c_uint16,
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c_int16,
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c_uint32,
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c_int32,
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c_float,
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c_double,
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None,
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None,
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None,
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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://gdal.org/api/raster_c_api.html#_CPPv415GDALColorInterp
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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", # Grayscale
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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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# GDAL virtual filesystems prefix.
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VSI_FILESYSTEM_PREFIX = "/vsi"
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# Fixed base path for buffer-based GDAL in-memory files.
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VSI_MEM_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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