Repository: ASFHyP3/asf-tools (language: python)

Issue:
update changelog for minor release
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Discussion / hints:

Fix patch:
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 00000000..e15e7069
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+# These owners will be requested for review when someone opens a pull request.
+*       @ASFHyP3/plugins
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a192f837..4f60f507 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/) 
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0]
+
+### Added
+* `asf_tools.flood_map` and an associated `flood_map` entrypoint for making
+  flood depth maps with products generated by `asf_tools.water_map`. This
+  functionality is still under active development and the products created
+  using this function are likely to change in the future.
 
 ## [0.3.3](https://github.com/ASFHyP3/asf-tools/compare/v0.3.2...v0.3.3)
 
diff --git a/asf_tools/README.md b/asf_tools/README.md
index cb0f7c1e..299aafab 100644
--- a/asf_tools/README.md
+++ b/asf_tools/README.md
@@ -126,3 +126,27 @@ water_map --help
 
 For details on the algorithm see the `asf_tools.water_map.make_water_map` docstring.
 <!-- FIXME: Link to API reference on our docs page! -->
+
+### Flood depth mapping
+
+**Warning:** The flood depth tool is still under active development and the products
+created using this tool are likely to change in the future.
+
+The `flood_map` tool allows you to create an estimated flood depth map from the surface
+water extent map created by the `water_map` tool. 
+
+Additionally, a HAND (height above nearest drainage) GeoTIFF that is pixel aligned to
+the surface water extent map is required. An ideal candidate is the HAND image created 
+by the `water_map` tool. 
+
+To make a flood depth map, run:
+```
+flood_map [OUT_RASTER] [SURFACE_WATER_MAP] [HAND_RASTER]
+```
+
+For more information and to see the options available, see:
+```
+flood_map --help
+```
+
+For details on the algorithm see the `asf_tools.flood_map.make_flood_map` docstring.
diff --git a/asf_tools/data/water_extent.vrt b/asf_tools/data/water_extent.vrt
new file mode 100644
index 00000000..3e19895f
--- /dev/null
+++ b/asf_tools/data/water_extent.vrt
@@ -0,0 +1,3793 @@
+<VRTDataset rasterXSize="1440000" rasterYSize="560000">
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+  <GeoTransform> -1.8000000000000000e+02,  2.5000000000000017e-04,  0.0000000000000000e+00,  8.0000000000000000e+01,  0.0000000000000000e+00, -2.5000000000000017e-04</GeoTransform>
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+      <SourceBand>1</SourceBand>
+      <SourceProperties RasterXSize="40000" RasterYSize="40000" DataType="Byte" BlockXSize="256" BlockYSize="256" />
+      <SrcRect xOff="0" yOff="0" xSize="40000" ySize="40000" />
+      <DstRect xOff="1400000" yOff="120000" xSize="40000" ySize="40000" />
+    </SimpleSource>
+    <SimpleSource>
+      <SourceFilename relativeToVRT="0">/vsicurl/https://storage.googleapis.com/global-surface-water/downloads2019v2/occurrence/occurrence_170E_60Nv1_1_2019.tif</SourceFilename>
+      <SourceBand>1</SourceBand>
+      <SourceProperties RasterXSize="40000" RasterYSize="40000" DataType="Byte" BlockXSize="256" BlockYSize="256" />
+      <SrcRect xOff="0" yOff="0" xSize="40000" ySize="40000" />
+      <DstRect xOff="1400000" yOff="80000" xSize="40000" ySize="40000" />
+    </SimpleSource>
+    <SimpleSource>
+      <SourceFilename relativeToVRT="0">/vsicurl/https://storage.googleapis.com/global-surface-water/downloads2019v2/occurrence/occurrence_170E_70Nv1_1_2019.tif</SourceFilename>
+      <SourceBand>1</SourceBand>
+      <SourceProperties RasterXSize="40000" RasterYSize="40000" DataType="Byte" BlockXSize="256" BlockYSize="256" />
+      <SrcRect xOff="0" yOff="0" xSize="40000" ySize="40000" />
+      <DstRect xOff="1400000" yOff="40000" xSize="40000" ySize="40000" />
+    </SimpleSource>
+    <SimpleSource>
+      <SourceFilename relativeToVRT="0">/vsicurl/https://storage.googleapis.com/global-surface-water/downloads2019v2/occurrence/occurrence_170E_80Nv1_1_2019.tif</SourceFilename>
+      <SourceBand>1</SourceBand>
+      <SourceProperties RasterXSize="40000" RasterYSize="40000" DataType="Byte" BlockXSize="256" BlockYSize="256" />
+      <SrcRect xOff="0" yOff="0" xSize="40000" ySize="40000" />
+      <DstRect xOff="1400000" yOff="0" xSize="40000" ySize="40000" />
+    </SimpleSource>
+  </VRTRasterBand>
+</VRTDataset>
diff --git a/asf_tools/flood_map.py b/asf_tools/flood_map.py
new file mode 100644
index 00000000..abf969b6
--- /dev/null
+++ b/asf_tools/flood_map.py
@@ -0,0 +1,243 @@
+"""Generate flood depth map from surface water extent map.
+
+Create a flood depth map from a surface water extent map and
+a HAND image. The HAND image must be pixel-aligned (same extent and size) to
+the water extent map, and the surface water extent map should be a byte GeoTIFF
+indicating water (true), not water (false). Flood depth maps are estimated
+using either a numerical, normalized median absolute deviation, logarithmic
+or iterative approach.
+"""
+
+import argparse
+import logging
+import sys
+import tempfile
+import warnings
+from pathlib import Path
+from typing import Callable, Tuple, Union
+
+import numpy as np
+from osgeo import gdal
+from scipy import ndimage, optimize, stats
+
+from asf_tools.composite import get_epsg_code, write_cog
+
+log = logging.getLogger(__name__)
+
+
+def get_coordinates(info: dict) -> Tuple[int, int, int, int]:
+    west, south = info['cornerCoordinates']['lowerLeft']
+    east, north = info['cornerCoordinates']['upperRight']
+    return west, south, east, north
+
+
+def get_waterbody(input_info: dict, threshold: float = 30.) -> np.array:
+    epsg = get_epsg_code(input_info)
+
+    west, south, east, north = get_coordinates(input_info)
+    width, height = input_info['size']
+
+    data_dir = Path(__file__).parent / 'data'
+    water_extent_vrt = data_dir / 'water_extent.vrt'  # All Perennial Flood Data
+
+    with tempfile.NamedTemporaryFile() as water_extent_file:
+        gdal.Warp(water_extent_file.name, str(water_extent_vrt), dstSRS=f'EPSG:{epsg}',
+                  outputBounds=[west, south, east, north],
+                  width=width, height=height, resampleAlg='nearest', format='GTiff')
+        water_array = gdal.Open(water_extent_file.name, gdal.GA_ReadOnly).ReadAsArray()
+
+    return water_array > threshold
+
+
+def iterative(hand: np.array, extent: np.array, water_levels: np.array = range(15)):
+    def _goal_ts(w):
+        iterative_flood_extent = hand < w  # w=water level
+        tp = np.nansum(np.logical_and(iterative_flood_extent == 1, extent == 1))  # true positive
+        fp = np.nansum(np.logical_and(iterative_flood_extent == 1, extent == 0))  # False positive
+        fn = np.nansum(np.logical_and(iterative_flood_extent == 0, extent == 1))  # False negative
+        return 1 - tp / (tp + fp + fn)  # threat score #we will minimize goal func, hence 1-threat_score.
+
+    class MyBounds(object):
+        def __init__(self, xmax=max(water_levels), xmin=min(water_levels)):
+            self.xmax = np.array(xmax)
+            self.xmin = np.array(xmin)
+
+        def __call__(self, **kwargs):
+            x = kwargs["x_new"]
+            tmax = bool(np.all(x <= self.xmax))
+            tmin = bool(np.all(x >= self.xmin))
+            return tmax and tmin
+
+    bounds = MyBounds()
+    x0 = [np.mean(water_levels)]
+    opt_res = optimize.basinhopping(_goal_ts, x0, niter=10000, niter_success=100, accept_test=bounds)
+    if opt_res.message[0] == 'success condition satisfied' \
+            or opt_res.message[0] == 'requested number of basinhopping iterations completed successfully':
+        best_water_level = opt_res.x[0]
+    else:
+        best_water_level = np.inf  # unstable solution.
+    return best_water_level
+
+
+def logstat(data: np.ndarray, func: Callable = np.nanstd) -> Union[np.ndarray, float]:
+    """ Calculate a function in logarithmic scale and return in linear scale.
+        INF values inside the data array are set to nan.
+
+        Args:
+            data: array of data
+            func: statistical function to calculate in logarithmic scale
+        Returns:
+            statistic: statistic of data in linear scale
+    """
+    ld = np.log(data)
+    ld[np.isinf(ld)] = np.nan
+    st = func(ld)
+    return np.exp(st)
+
+
+def estimate_flood_depth(label, hand, flood_labels, estimator='iterative', water_level_sigma=3.,
+                         iterative_bounds=(0, 15)):
+    with warnings.catch_warnings():
+        warnings.filterwarnings('ignore', r'Mean of empty slice')
+
+        if estimator.lower() == "iterative":
+            return iterative(hand, flood_labels == label, water_levels=iterative_bounds)
+
+        if estimator.lower() == "numpy":
+            hand_mean = np.nanmean(hand[flood_labels == label])
+            hand_std = np.nanstd(hand[flood_labels == label])
+
+        elif estimator.lower() == "nmad":
+            hand_mean = np.nanmean(hand[flood_labels == label])
+            hand_std = stats.median_abs_deviation(hand[flood_labels == label], scale='normal',
+                                                  nan_policy='omit')
+        elif estimator.lower() == "logstat":
+            hand_mean = logstat(hand[flood_labels == label], func=np.nanmean)
+            hand_std = logstat(hand[flood_labels == label])
+
+        else:
+            raise ValueError(f'Unknown flood depth estimator {estimator}')
+
+    return hand_mean + water_level_sigma * hand_std
+
+
+def make_flood_map(out_raster: Union[str, Path], water_raster: Union[str, Path],
+                   hand_raster: Union[str, Path], estimator: str = 'iterative',
+                   water_level_sigma: float = 3.,
+                   known_water_threshold: float = 30.,
+                   iterative_bounds: Tuple[int, int] = (0, 15)):
+    """Create a flood depth map from a surface water extent map.
+
+    WARNING: This functionality is still under active development and the products
+    created using this function are likely to change in the future.
+
+    Create a flood depth map from a single surface water extent map and
+    a HAND image. The HAND image must be pixel-aligned to the surface water extent map.
+    The the surface water extent map should be a byte GeoTIFF indicating water (true) and
+    not water (false)
+
+    Known perennial Global Surface-water data are produced under the Copernicus Programme (Pekel et al., 2016),
+    and are included with surface-water detection maps when generating the flood depth product.
+
+    Flood depth maps are estimated using one of the approaches:
+    *Iterative: (Default) Basin hopping optimization method matches flooded areas to flood depth
+    estimates given by the HAND layer. This is the most accurate method but also the
+    most time-intensive.
+    *Normalized Median Absolute Deviation (nmad): Uses a median operator to estimate
+    the variation to increase robustness in the presence of outliers.
+    *Logstat: Calculates the mean and standard deviation of HAND heights in the logarithmic
+    domain to improve robustness for very non-Gaussian data distributions.
+    *Numpy: Calculates statistics on a linear scale. Least robust to outliers and non-Gaussian
+    distributions.
+
+    Args:
+        out_raster: Flood depth GeoTIFF to create
+        water_raster: Surface water extent GeoTIFF
+        hand_raster: Height Above Nearest Drainage (HAND) GeoTIFF aligned to the surface water extent raster
+        estimator: Estimation approach for determining flood depth
+        water_level_sigma: Max water height used in logstat, nmad, and numpy estimations
+        known_water_threshold: Threshold for extracting the known water area in percent
+        iterative_bounds: Bounds on basin-hopping algorithm used in iterative estimation
+
+    References:
+        Jean-Francios Pekel, Andrew Cottam, Noel Gorelik, Alan S. Belward. 2016. <https://doi:10.1038/nature20584>
+    """
+
+    info = gdal.Info(str(water_raster), format='json')
+    epsg = get_epsg_code(info)
+    geotransform = info['geoTransform']
+
+    hand_array = gdal.Open(str(hand_raster), gdal.GA_ReadOnly).ReadAsArray()
+
+    log.info('Fetching perennial flood data.')
+    known_water_mask = get_waterbody(info, threshold=known_water_threshold)
+
+    water_map = gdal.Open(water_raster).ReadAsArray()
+    flood_mask = np.bitwise_or(water_map, known_water_mask)
+
+    labeled_flood_mask, num_labels = ndimage.label(flood_mask)
+    object_slices = ndimage.find_objects(labeled_flood_mask)
+    log.info(f'Detected {num_labels} water bodies...')
+
+    flood_depth = np.zeros(flood_mask.shape)
+
+    for ll in range(1, num_labels):  # Skip first, largest label.
+        slices = object_slices[ll - 1]
+        min0, max0 = slices[0].start, slices[0].stop
+        min1, max1 = slices[1].start, slices[1].stop
+
+        flood_window = labeled_flood_mask[min0:max0, min1:max1]
+        hand_window = hand_array[min0:max0, min1:max1]
+
+        water_height = estimate_flood_depth(ll, hand_window, flood_window, estimator=estimator,
+                                            water_level_sigma=water_level_sigma, iterative_bounds=iterative_bounds)
+
+        flood_depth_window = flood_depth[min0:max0, min1:max1]
+        flood_depth_window[flood_window == ll] = water_height - hand_window[flood_window == ll]
+
+    flood_depth[flood_depth < 0] = 0
+
+    write_cog(str(out_raster).replace('.tif', f'_{estimator}_WaterDepth.tif'), flood_depth, transform=geotransform,
+              epsg_code=epsg, dtype=gdal.GDT_Float64, nodata_value=False)
+    write_cog(str(out_raster).replace('.tif', f'_{estimator}_FloodMask.tif'), flood_mask, transform=geotransform,
+              epsg_code=epsg, dtype=gdal.GDT_Byte, nodata_value=False)
+
+    flood_mask[known_water_mask] = 0
+    flood_depth[np.bitwise_not(flood_mask)] = 0
+
+    write_cog(str(out_raster).replace('.tif', f'_{estimator}_FloodDepth.tif'), flood_depth, transform=geotransform,
+              epsg_code=epsg, dtype=gdal.GDT_Float64, nodata_value=False)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter
+    )
+    parser.add_argument('out_raster',
+                        help='File flood depth map will be saved to.')
+    parser.add_argument('water_extent_map',
+                        help='Hyp3-Generated water extent raster file.')
+    parser.add_argument('hand_raster',
+                        help='Height Above Nearest Drainage (HAND) GeoTIFF aligned to the RTC rasters. '
+                             'If not specified, HAND data will be extracted from a Copernicus GLO-30 DEM based HAND.')
+
+    parser.add_argument('--estimator', type=str, default='iterative', choices=['iterative', 'logstat', 'nmad', 'numpy'],
+                        help='Flood depth estimation approach.')
+    parser.add_argument('--water-level-sigma', type=float, default=3.,
+                        help='Estimate max water height for each object.')
+    parser.add_argument('--known-water-threshold', type=float, default=30.,
+                        help='Threshold for extracting known water area in percent')
+    parser.add_argument('--iterative-bounds', type=int, nargs=2, default=[0, 15], help='.')
+
+    parser.add_argument('-v', '--verbose', action='store_true', help='Turn on verbose logging')
+    args = parser.parse_args()
+
+    level = logging.DEBUG if args.verbose else logging.INFO
+    logging.basicConfig(stream=sys.stdout, format='%(asctime)s - %(levelname)s - %(message)s', level=level)
+    log.debug(' '.join(sys.argv))
+
+    make_flood_map(args.out_raster, args.water_extent_map, args.hand_raster, args.estimator, args.water_level_sigma,
+                   args.known_water_threshold, tuple(args.iterative_bounds))
+
+    log.info(f"Flood Map written to {args.out_raster}.")
diff --git a/environment.yml b/environment.yml
index 3df9ce6c..0de2f806 100644
--- a/environment.yml
+++ b/environment.yml
@@ -27,6 +27,7 @@ dependencies:
   - rasterio
   - scikit-fuzzy
   - scikit-image
+  - scipy
   - shapely
   - pip:
     # for testing
diff --git a/setup.py b/setup.py
index cd4cf3ff..a8adc191 100644
--- a/setup.py
+++ b/setup.py
@@ -38,6 +38,7 @@
         'pysheds>=0.3',
         'scikit-fuzzy',
         'scikit-image',
+        'scipy',
         'shapely',
         'rasterio',
     ],
@@ -62,6 +63,7 @@
             'make_composite = asf_tools.composite:main',
             'water_map = asf_tools.water_map:main',
             'calculate_hand = asf_tools.hand.calculate:main',
+            'flood_map = asf_tools.flood_map:main',
         ]
     },
 


Test patch:
diff --git a/tests/conftest.py b/tests/conftest.py
index a4825eaa..cc697207 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -37,3 +37,17 @@ def hand_candidates():
     hand_file = Path(__file__).parent / 'data' / 'hand_candidates.npz'
     hand_data = np.load(hand_file)
     return hand_data['hand_candidates']
+
+
+@pytest.fixture(scope='session')
+def hand_window():
+    hand_file = Path(__file__).parent / 'data' / 'hand_window.npz'
+    hand_data = np.load(hand_file)
+    return hand_data['hand_window']
+
+
+@pytest.fixture(scope='session')
+def flood_window():
+    flood_file = Path(__file__).parent / 'data' / 'flood_window.npz'
+    flood_data = np.load(flood_file)
+    return flood_data['flood_window']
\ No newline at end of file
diff --git a/tests/data/flood_window.npz b/tests/data/flood_window.npz
new file mode 100644
index 00000000..63706444
Binary files /dev/null and b/tests/data/flood_window.npz differ
diff --git a/tests/data/hand_window.npz b/tests/data/hand_window.npz
new file mode 100644
index 00000000..3b0bd5a0
Binary files /dev/null and b/tests/data/hand_window.npz differ
diff --git a/tests/test_entrypoints.py b/tests/test_entrypoints.py
index e25f172a..e19c36f8 100644
--- a/tests/test_entrypoints.py
+++ b/tests/test_entrypoints.py
@@ -11,3 +11,8 @@ def test_water_map(script_runner):
 def test_make_hand(script_runner):
     ret = script_runner.run('calculate_hand', '-h')
     assert ret.success
+
+
+def test_flood_map(script_runner):
+    ret = script_runner.run('flood_map', '-h')
+    assert ret.success
diff --git a/tests/test_flood_map.py b/tests/test_flood_map.py
new file mode 100644
index 00000000..cd28edbe
--- /dev/null
+++ b/tests/test_flood_map.py
@@ -0,0 +1,90 @@
+import numpy as np
+import pytest
+from osgeo_utils.gdalcompare import find_diff
+
+from osgeo import gdal
+from asf_tools import flood_map
+from asf_tools.composite import read_as_array
+from asf_tools.tile import tile_array
+
+
+def test_get_coordinates():
+    water_raster = '/vsicurl/https://hyp3-testing.s3.us-west-2.amazonaws.com/asf-tools/flood_map/watermap.tif'
+    info = gdal.Info(water_raster, format='json')
+
+    west, south, east, north = flood_map.get_coordinates(info)
+
+    assert west == 75390.0
+    assert south == 3265560.0
+    assert east == 357030.0
+    assert north == 3473460.0
+
+
+@pytest.mark.integration
+def test_get_waterbody():
+    water_raster = '/vsicurl/https://hyp3-testing.s3.us-west-2.amazonaws.com/asf-tools/flood_map/watermap.tif'
+    info = gdal.Info(water_raster, format='json')
+
+    known_water_mask = flood_map.get_waterbody(info, threshold=30)
+
+    test_mask = '/vsicurl/https://hyp3-testing.s3.us-west-2.amazonaws.com/asf-tools/flood_map/known_water_mask.tif'
+    test_mask_array = gdal.Open(test_mask, gdal.GA_ReadOnly).ReadAsArray()
+
+    assert np.all(known_water_mask == test_mask_array)
+
+
+def test_logstat():
+    arr = [10, 100, 1000, 10000, 100000]
+    logstd = flood_map.logstat(arr)
+
+    assert logstd == 25.95455351947008
+
+
+@pytest.mark.integration
+def test_estimate_flood_depths_iterative(flood_window, hand_window):
+    water_height = flood_map.estimate_flood_depth(1, hand_window, flood_window, estimator='iterative',
+                                                  water_level_sigma=3,
+                                                  iterative_bounds=(0, 25))
+    # FIXME: Basin-hopping appears to be non-deterministic. Return values vary *wildly*.
+    # assert np.isclose(water_height, 7.394713346252969)
+
+
+@pytest.mark.integration
+def test_estimate_flood_depths_logstat(flood_window, hand_window):
+    water_height = flood_map.estimate_flood_depth(1, hand_window, flood_window, estimator='logstat',
+                                                  water_level_sigma=3,
+                                                  iterative_bounds=(0, 15))
+    assert water_height == 21.02364492416382
+
+
+@pytest.mark.integration
+def test_estimate_flood_depths_nmad(flood_window, hand_window):
+    water_height = flood_map.estimate_flood_depth(1, hand_window, flood_window, estimator='nmad', water_level_sigma=3,
+                                                  iterative_bounds=(0, 15))
+
+    assert water_height == 7.887911175434299
+
+
+@pytest.mark.integration
+def test_estimate_flood_depths_numpy(flood_window, hand_window):
+    water_height = flood_map.estimate_flood_depth(1, hand_window, flood_window, estimator='numpy', water_level_sigma=3,
+                                                  iterative_bounds=(0, 15))
+    assert water_height == 16.353520154953003
+
+
+@pytest.mark.integration
+def test_make_flood_map(tmp_path):
+    water_raster = '/vsicurl/https://hyp3-testing.s3.us-west-2.amazonaws.com/asf-tools/flood_map/watermap.tif'
+    hand_geotif = '/vsicurl/https://hyp3-testing.s3-us-west-2.amazonaws.com/asf-tools/flood_map/watermap_HAND.tif'
+
+    out_flood_map = tmp_path / 'flood_map.tif'
+    flood_map.make_flood_map(out_flood_map, water_raster, hand_geotif)
+    out_flood_map = out_flood_map.parent / f'{out_flood_map.stem}_iterative_FloodDepth.tif'
+
+    assert out_flood_map.exists()
+
+    golden_flood_map = '/vsicurl/https://hyp3-testing.s3-us-west-2.amazonaws.com/asf-tools/flood_map/' \
+                       'flood_map_iterative.tif'
+
+    diffs = find_diff(golden_flood_map, str(out_flood_map))
+    assert diffs == 0