Python osgeo.gdal 模块，GDT_UInt16() 实例源码

def create_mask_from_vector(vector_data_path, cols, rows, geo_transform, projection, target_value=1,
                            output_fname='', dataset_format='MEM'):
    """
    Rasterize the given vector (wrapper for gdal.RasterizeLayer). Return a gdal.Dataset.
    :param vector_data_path: Path to a shapefile
    :param cols: Number of columns of the result
    :param rows: Number of rows of the result
    :param geo_transform: Returned value of gdal.Dataset.GetGeoTransform (coefficients for
                          transforming between pixel/line (P,L) raster space, and projection
                          coordinates (Xp,Yp) space.
    :param projection: Projection definition string (Returned by gdal.Dataset.GetProjectionRef)
    :param target_value: Pixel value for the pixels. Must be a valid gdal.GDT_UInt16 value.
    :param output_fname: If the dataset_format is GeoTIFF, this is the output file name
    :param dataset_format: The gdal.Dataset driver name. [default: MEM]
    """
    data_source = gdal.OpenEx(vector_data_path, gdal.OF_VECTOR)
    if data_source is None:
        report_and_exit("File read failed: %s", vector_data_path)
    layer = data_source.GetLayer(0)
    driver = gdal.GetDriverByName(dataset_format)
    target_ds = driver.Create(output_fname, cols, rows, 1, gdal.GDT_UInt16)
    target_ds.SetGeoTransform(geo_transform)
    target_ds.SetProjection(projection)
    gdal.RasterizeLayer(target_ds, [1], layer, burn_values=[target_value])
    return target_ds

def write_file(output_name,output_array,GeoT,xsize,ysize,proJ,driverName='GTiff'):
    print "creating", output_name
    dr=gdal.GetDriverByName(driverName)
    dr.Register()
    do=dr.Create(output_name,xsize,ysize,1,gdal.GDT_UInt16,options = [ 'COMPRESS=LZW' ])

    do.SetGeoTransform(GeoT)
    do.SetProjection(proJ)
    do.GetRasterBand(1).WriteArray(output_array)
    do.GetRasterBand(1).SetNoDataValue(65535)
    do=None


# Function to wirte multi-dimesion array to tiff file

def write_file(output_name, output_array, GeoT, xsize, ysize, proJ, driverName='GTiff'):
    print "creating", output_name
    dr = gdal.GetDriverByName(driverName)
    dr.Register()
    do = dr.Create(output_name, xsize, ysize, 1, gdal.GDT_UInt16, options=['COMPRESS=LZW'])

    do.SetGeoTransform(GeoT)
    do.SetProjection(proJ)
    do.GetRasterBand(1).WriteArray(output_array)
    do.GetRasterBand(1).SetNoDataValue(32767)
    do = None

def write_file(output_name, output_array, GeoT, xsize, ysize, proJ, driverName='GTiff'):
    print "creating", output_name
    dr = gdal.GetDriverByName(driverName)
    dr.Register()
    do = dr.Create(output_name, xsize, ysize, 1, gdal.GDT_UInt16, options=['COMPRESS=LZW'])

    do.SetGeoTransform(GeoT)
    do.SetProjection(proJ)
    do.GetRasterBand(1).WriteArray(output_array)
    do.GetRasterBand(1).SetNoDataValue(65535)
    do = None

def merge_pile_into_mosaic(mosaic_ds, 
                           pile_md_filename,
                           selected_i,
                           selected_img,
                           processing_options):

    pile_parts = os.path.basename(pile_md_filename).split('_')[0:3]
    assert pile_parts[0] == 'uf'

    uf_i = int(pile_parts[1])
    uf_j = int(pile_parts[2])

    if processing_options.get('normalize_intensity',False):
        pile_md = json.load(open(pile_md_filename))
        selected_img = selected_img * 1000.0 \
            / pile_md['intensity_median'][selected_i]


    mosaic_ds.GetRasterBand(1).WriteArray(
        selected_img, uf_i * 256, uf_j * 256)

    alpha_band = mosaic_ds.GetRasterBand(mosaic_ds.RasterCount)
    if alpha_band.GetColorInterpretation() == gdal.GCI_AlphaBand:

        if alpha_band.DataType == gdal.GDT_UInt16:
            opaque = 65535
        else:
            opaque = 255

        alpha_band.WriteArray(
            numpy.ones(selected_img.shape) * opaque,
             uf_i * 256, uf_j * 256)

def make_metatile(pile_directory):
    mosaic_filename = os.path.join(pile_directory,'mosaic.tif')
    mosaic_ds = gdal.GetDriverByName('GTiff').Create(
        mosaic_filename, 4096, 4096, 1, gdal.GDT_UInt16)

    # TODO: Try to add georeferencing...

    return mosaic_filename, mosaic_ds

def open_data(filename):
    '''
    The function open and load the image given its name. 
    The type of the data is checked from the file and the scipy array is initialized accordingly.
    Input:
        filename: the name of the file
    Output:
        im: the data cube
        GeoTransform: the geotransform information 
        Projection: the projection information
    '''
    data = gdal.Open(filename,gdal.GA_ReadOnly)
    if data is None:
        print 'Impossible to open '+filename
        exit()
    nc = data.RasterXSize
    nl = data.RasterYSize
    d  = data.RasterCount

    # Get the type of the data
    gdal_dt = data.GetRasterBand(1).DataType
    if gdal_dt == gdal.GDT_Byte:
        dt = 'uint8'
    elif gdal_dt == gdal.GDT_Int16:
        dt = 'int16'
    elif gdal_dt == gdal.GDT_UInt16:
        dt = 'uint16'
    elif gdal_dt == gdal.GDT_Int32:
        dt = 'int32'
    elif gdal_dt == gdal.GDT_UInt32:
        dt = 'uint32'

    elif gdal_dt == gdal.GDT_Float32:
        dt = 'float32'
    elif gdal_dt == gdal.GDT_Float64:
        dt = 'float64'
    elif gdal_dt == gdal.GDT_CInt16 or gdal_dt == gdal.GDT_CInt32 or gdal_dt == gdal.GDT_CFloat32 or gdal_dt == gdal.GDT_CFloat64 :
        dt = 'complex64'
    else:
        print 'Data type unkown'
        exit()

    # Initialize the array
    if d == 1:
        im = sp.empty((nl,nc),dtype=dt) 
    else:
        im = sp.empty((nl,nc,d),dtype=dt) 

    if d == 1:
        im[:,:]=data.GetRasterBand(1).ReadAsArray()
    else :
        for i in range(d):
            im[:,:,i]=data.GetRasterBand(i+1).ReadAsArray()

    GeoTransform = data.GetGeoTransform()
    Projection = data.GetProjection()
    data = None
    return im,GeoTransform,Projection

def write_data(outname,im,GeoTransform,Projection):
    '''
    The function write the image on the  hard drive.
    Input: 
        outname: the name of the file to be written
        im: the image cube
        GeoTransform: the geotransform information 
        Projection: the projection information
    Output:
        Nothing --
    '''
    nl = im.shape[0]
    nc = im.shape[1]
    if im.ndim == 2:
        d=1
    else:
        d = im.shape[2]

    driver = gdal.GetDriverByName('GTiff')
    dt = im.dtype.name
    # Get the data type
    if dt == 'bool' or dt == 'uint8':
        gdal_dt=gdal.GDT_Byte
    elif dt == 'int8' or dt == 'int16':
        gdal_dt=gdal.GDT_Int16
    elif dt == 'uint16':
        gdal_dt=gdal.GDT_UInt16
    elif dt == 'int32':
        gdal_dt=gdal.GDT_Int32
    elif dt == 'uint32':
        gdal_dt=gdal.GDT_UInt32
    elif dt == 'int64' or dt == 'uint64' or dt == 'float16' or dt == 'float32':
        gdal_dt=gdal.GDT_Float32
    elif dt == 'float64':
        gdal_dt=gdal.GDT_Float64
    elif dt == 'complex64':
        gdal_dt=gdal.GDT_CFloat64
    else:
        print 'Data type non-suported'
        exit()

    dst_ds = driver.Create(outname,nc,nl, d, gdal_dt)
    dst_ds.SetGeoTransform(GeoTransform)
    dst_ds.SetProjection(Projection)

    if d==1:
        out = dst_ds.GetRasterBand(1)
        out.WriteArray(im)
        out.FlushCache()
    else:
        for i in range(d):
            out = dst_ds.GetRasterBand(i+1)
            out.WriteArray(im[:,:,i])
            out.FlushCache()
    dst_ds = None