def raster2pyramid(
input_file,
output_dir,
options
):
"""
Creates a tile pyramid out of an input raster dataset.
"""
pyramid_type = options["pyramid_type"]
scale_method = options["scale_method"]
output_format = options["output_format"]
resampling = options["resampling"]
zoom = options["zoom"]
bounds = options["bounds"]
overwrite = options["overwrite"]
# Prepare process parameters
minzoom, maxzoom = _get_zoom(zoom, input_file, pyramid_type)
process_file = os.path.join(
os.path.dirname(os.path.realpath(__file__)),
"tilify.py"
)
with rasterio.open(input_file, "r") as input_raster:
output_bands = input_raster.count
input_dtype = input_raster.dtypes[0]
output_dtype = input_raster.dtypes[0]
nodataval = input_raster.nodatavals[0]
if not nodataval:
nodataval = 0
if output_format == "PNG":
if output_bands > 3:
output_bands = 3
output_dtype = 'uint8'
scales_minmax = ()
if scale_method == "dtype_scale":
for index in range(1, output_bands+1):
scales_minmax += (DTYPE_RANGES[input_dtype], )
elif scale_method == "minmax_scale":
for index in range(1, output_bands+1):
band = input_raster.read(index)
scales_minmax += ((band.min(), band.max()), )
elif scale_method == "crop":
for index in range(1, output_bands+1):
scales_minmax += ((0, 255), )
if input_dtype == "uint8":
scale_method = None
scales_minmax = ()
for index in range(1, output_bands+1):
scales_minmax += ((None, None), )
# Create configuration
config = {}
config.update(
process_file=process_file,
output={
"path": output_dir,
"format": output_format,
"type": pyramid_type,
"bands": output_bands,
"dtype": output_dtype
},
scale_method=scale_method,
scales_minmax=scales_minmax,
input_files={"raster": input_file},
config_dir=os.getcwd(),
process_minzoom=minzoom,
process_maxzoom=maxzoom,
nodataval=nodataval,
resampling=resampling,
bounds=bounds,
pixelbuffer=5,
baselevel={"zoom": maxzoom, "resampling": resampling}
)
LOGGER.info("preparing process ...")
try:
mapchete = Mapchete(
MapcheteConfig(
config,
zoom=zoom,
bounds=bounds
)
)
except PyCompileError as error:
print error
return
except:
raise
# Prepare output directory and logging
if not os.path.exists(output_dir):
os.makedirs(output_dir)
logging.config.dictConfig(get_log_config(mapchete))
for zoom in reversed(range(minzoom, maxzoom+1)):
# Determine work tiles and run
work_tiles = mapchete.get_work_tiles(zoom)
func = partial(_worker,
mapchete=mapchete,
overwrite=overwrite
)
pool = Pool()
try:
pool.map_async(func, work_tiles)
pool.close()
except KeyboardInterrupt:
LOGGER.info(
"Caught KeyboardInterrupt, terminating workers"
)
pool.terminate()
break
except:
raise
finally:
pool.close()
pool.join()
