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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import codecs |
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import cv2 |
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import numpy as np |
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import argparse |
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import geojson |
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from geojson import Polygon, Feature, FeatureCollection |
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from utils import Raster, Timer |
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def _gt_convert(x, y, geotf): |
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x_geo = geotf[0] + x * geotf[1] + y * geotf[2] |
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y_geo = geotf[3] + x * geotf[4] + y * geotf[5] |
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return x_geo, y_geo |
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@Timer |
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def convert_data(mask_path, save_path, epsilon=0): |
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raster = Raster(mask_path) |
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img = raster.getArray() |
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geo_writer = codecs.open(save_path, "w", encoding="utf-8") |
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clas = np.unique(img) |
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cv2_v = (cv2.__version__.split(".")[0] == "3") |
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feats = [] |
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if not isinstance(epsilon, (int, float)): |
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epsilon = 0 |
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for iclas in range(1, len(clas)): |
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tmp = np.zeros_like(img).astype("uint8") |
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tmp[img == iclas] = 1 |
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# TODO: Detect internal and external contour |
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results = cv2.findContours(tmp, cv2.RETR_EXTERNAL, |
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cv2.CHAIN_APPROX_TC89_KCOS) |
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contours = results[1] if cv2_v else results[0] |
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# hierarchys = results[2] if cv2_v else results[1] |
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if len(contours) == 0: |
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continue |
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for contour in contours: |
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contour = cv2.approxPolyDP(contour, epsilon, True) |
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polys = [] |
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for point in contour: |
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x, y = point[0] |
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xg, yg = _gt_convert(x, y, raster.geot) |
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polys.append((xg, yg)) |
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polys.append(polys[0]) |
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feat = Feature( |
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geometry=Polygon([polys]), properties={"class": int(iclas)}) |
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feats.append(feat) |
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gjs = FeatureCollection(feats) |
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geo_writer.write(geojson.dumps(gjs)) |
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geo_writer.close() |
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parser = argparse.ArgumentParser(description="input parameters") |
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parser.add_argument("--mask_path", type=str, required=True, \ |
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help="The path of mask tif.") |
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parser.add_argument("--save_path", type=str, required=True, \ |
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help="The path to save the results, file suffix is `*.json`.") |
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parser.add_argument("--epsilon", type=float, default=0, \ |
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help="The CV2 simplified parameters, `0` is the default.") |
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if __name__ == "__main__": |
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args = parser.parse_args() |
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convert_data(args.mask_path, args.save_path, args.epsilon) |
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