46 lines
1.5 KiB
Python
46 lines
1.5 KiB
Python
"""
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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 http://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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