gdal/autotest/alg/sieve.py

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#!/usr/bin/env pytest
###############################################################################
# $Id$
#
# Project: GDAL/OGR Test Suite
# Purpose: Test SieveFilter() algorithm.
# Author: Frank Warmerdam <warmerdam@pobox.com>
#
###############################################################################
# Copyright (c) 2008, Frank Warmerdam <warmerdam@pobox.com>
# Copyright (c) 2009-2010, Even Rouault <even dot rouault at spatialys.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################
import pytest
from osgeo import gdal
###############################################################################
# Test a fairly default case.
@pytest.mark.require_driver("AAIGRID")
def test_sieve_1():
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("data/sieve_src.grd")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("tmp/sieve_1.tif", 5, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, None, dst_band, 2, 4)
cs_expected = 364
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("tmp/sieve_1.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Try eight connected.
@pytest.mark.require_driver("AAIGRID")
def test_sieve_2():
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("data/sieve_src.grd")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("tmp/sieve_2.tif", 5, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, None, dst_band, 2, 8)
cs_expected = 370
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("tmp/sieve_2.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Do a sieve resulting in unmergable polygons.
@pytest.mark.require_driver("AAIGRID")
def test_sieve_3():
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("data/unmergable.grd")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("tmp/sieve_3.tif", 5, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, None, dst_band, 2, 8)
# cs_expected = 472
cs_expected = 451
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("tmp/sieve_3.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Try the bug 2634 simplified data.
@pytest.mark.require_driver("AAIGRID")
def test_sieve_4():
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("data/sieve_2634.grd")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("tmp/sieve_4.tif", 10, 8, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, None, dst_band, 2, 4)
cs_expected = 98
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("tmp/sieve_4.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Same as sieve_1, but we provide a mask band
# This should yield the same result as we use an opaque band
@pytest.mark.require_driver("AAIGRID")
def test_sieve_5():
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("data/sieve_src.grd")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("tmp/sieve_1.tif", 5, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, dst_band.GetMaskBand(), dst_band, 2, 4)
cs_expected = 364
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("tmp/sieve_1.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Performance test. When increasing the 'size' parameter, performance
# should stay roughly linear with the number of pixels (i.e. size^2)
def test_sieve_6():
numpy = pytest.importorskip("numpy")
# Try 3002. Should run in less than 10 seconds
# size = 3002
size = 102
ds = gdal.GetDriverByName("MEM").Create("", size + 1, size)
ar = numpy.zeros((size, size + 1), dtype=numpy.uint8)
for i in range(size):
for j in range(int(size / 3)):
ar[i][size + 1 - 1 - i - 1 - 3 * j] = 255
ar[i][size + 1 - 1 - i - 3 * j] = 255
ar[i][0] = 255
ar[size - 1] = 255
ds.GetRasterBand(1).WriteArray(ar)
band = ds.GetRasterBand(1)
gdal.SieveFilter(band, None, band, 2, 4)
# ar = band.ReadAsArray()
# print(ar)
cs = band.Checksum()
if (size == 102 and cs != 60955) or (size == 3002 and cs != 63178):
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Test with nodata
@pytest.mark.require_driver("AAIGRID")
def test_sieve_7():
gdal.FileFromMemBuffer(
"/vsimem/sieve_7.asc",
"""ncols 7
nrows 7
xllcorner 440720.000000000000
yllcorner 3750120.000000000000
cellsize 60.000000000000
NODATA_value 0
0 0 0 0 0 0 0
0 1 1 1 1 1 1
0 1 0 0 1 1 1
0 1 0 2 2 2 1
0 1 1 2 1 2 1
0 1 1 2 2 2 1
0 1 1 1 1 1 1
""",
)
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("/vsimem/sieve_7.asc")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("/vsimem/sieve_7.tif", 7, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, src_band.GetMaskBand(), dst_band, 4, 4)
cs_expected = 42
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
gdal.Unlink("/vsimem/sieve_7.asc")
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("/vsimem/sieve_7.tif")
# Expected:
# [[0 0 0 0 0 0 0]
# [0 1 1 1 1 1 1]
# [0 1 0 0 1 1 1]
# [0 1 0 2 2 2 1]
# [0 1 1 2 2 2 1]
# [0 1 1 2 2 2 1]
# [0 1 1 1 1 1 1]]
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")
###############################################################################
# Test propagation in our search of biggest neighbour
@pytest.mark.require_driver("AAIGRID")
def test_sieve_8():
gdal.FileFromMemBuffer(
"/vsimem/sieve_8.asc",
"""ncols 7
nrows 7
xllcorner 440720.000000000000
yllcorner 3750120.000000000000
cellsize 60.000000000000
0 0 0 0 0 0 0
0 5 5 0 0 0 0
0 5 2 3 4 0 0
0 0 8 1 5 0 0
0 0 7 6 5 9 0
0 0 0 0 9 9 0
0 0 0 0 0 0 0
""",
)
drv = gdal.GetDriverByName("GTiff")
src_ds = gdal.Open("/vsimem/sieve_8.asc")
src_band = src_ds.GetRasterBand(1)
dst_ds = drv.Create("/vsimem/sieve_8.tif", 7, 7, 1, gdal.GDT_Byte)
dst_band = dst_ds.GetRasterBand(1)
gdal.SieveFilter(src_band, src_band.GetMaskBand(), dst_band, 4, 4)
# All non 0 should be mapped to 0
cs_expected = 0
cs = dst_band.Checksum()
dst_band = None
dst_ds = None
gdal.Unlink("/vsimem/sieve_8.asc")
if cs == cs_expected or gdal.GetConfigOption("CPL_DEBUG", "OFF") != "ON":
drv.Delete("/vsimem/sieve_8.tif")
if cs != cs_expected:
print("Got: ", cs)
pytest.fail("got wrong checksum")