wkblify_band_header()

def raster2pgsql.wkblify_band_header	(		options,
			band
	)

Writes band header into HEX-encoded WKB

Definition at line 720 of file raster2pgsql.py.

References check_hex(), gdt2pt(), pt2fmt(), and wkblify().

Referenced by wkblify_raster_level().

def wkblify_band_header(options, band):
    """Writes band header into HEX-encoded WKB"""
    assert band is not None, "Error: Missing GDAL raster band"

    hexwkb = ""

    first4bits = 0
    
    # If the register option is enabled, set the first bit to 1
    if options.register:
        first4bits = 128
        
    nodata = band.GetNoDataValue()
    # If there is no nodata value, set it to 0. Otherwise set the HasNodata bit to 1
    if nodata is not None:
        first4bits += 64
    else:
        nodata = 0
    
    # Encode pixel type
    pixtype = gdt2pt(band.DataType)['id']
    hexwkb += wkblify('B', pixtype + first4bits)
    
    # Encode nodata value (or Zero, if nodata unavailable) 
    hexwkb += wkblify(pt2fmt(pixtype), nodata)

    check_hex(hexwkb)
    return hexwkb

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