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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 tqdm import tqdm
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from utils import Raster, save_geotiff, Timer
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def _gt_convert(x_geo, y_geo, geotf):
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a = np.array([[geotf[1], geotf[2]], [geotf[4], geotf[5]]])
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b = np.array([x_geo - geotf[0], y_geo - geotf[3]])
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return np.round(np.linalg.solve(a, b)).tolist() # 解一元二次方程
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@Timer
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def convert_data(image_path, geojson_path):
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raster = Raster(image_path)
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tmp_img = np.zeros((raster.height, raster.width), dtype=np.int32)
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geo_reader = codecs.open(geojson_path, "r", encoding="utf-8")
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feats = geojson.loads(geo_reader.read())["features"] # 所有图像块
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for feat in tqdm(feats):
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geo = feat["geometry"]
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if geo["type"] == "Polygon": # 多边形
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geo_points = geo["coordinates"][0]
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elif geo["type"] == "MultiPolygon": # 多面
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geo_points = geo["coordinates"][0][0]
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else:
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raise TypeError("Geometry type must be `Polygon` or `MultiPolygon`, not {}.".format(geo["type"]))
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xy_points = np.array([
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_gt_convert(point[0], point[1], raster.geot)
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for point in geo_points
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]).astype(np.int32)
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# TODO: Label category
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cv2.fillPoly(tmp_img, [xy_points], 1) # 多边形填充
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ext = "." + geojson_path.split(".")[-1]
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save_geotiff(tmp_img, geojson_path.replace(ext, ".tif"), raster.proj, raster.geot)
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parser = argparse.ArgumentParser(description="input parameters")
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parser.add_argument("--image_path", type=str, required=True, \
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help="The path of original image.")
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parser.add_argument("--geojson_path", type=str, required=True, \
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help="The path of geojson.")
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if __name__ == "__main__":
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args = parser.parse_args()
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convert_data(args.image_path, args.geojson_path)
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