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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import codecs
import cv2
import numpy as np
import argparse
import geojson
from tqdm import tqdm
from utils import Raster, save_geotiff, translate_vector, time_it
def _gt_convert(x_geo, y_geo, geotf):
a = np.array([[geotf[1], geotf[2]], [geotf[4], geotf[5]]])
b = np.array([x_geo - geotf[0], y_geo - geotf[3]])
return np.round(np.linalg.solve(a, b)).tolist() # 解一元二次方程
@time_it
# TODO: update for vector2raster
def convert_data(image_path, geojson_path):
raster = Raster(image_path)
tmp_img = np.zeros((raster.height, raster.width), dtype=np.int32)
# vector to EPSG from raster
temp_geojson_path = translate_vector(geojson_path, raster.proj)
geo_reader = codecs.open(temp_geojson_path, "r", encoding="utf-8")
feats = geojson.loads(geo_reader.read())["features"] # 所有图像块
geo_reader.close()
for feat in tqdm(feats):
geo = feat["geometry"]
if geo["type"] == "Polygon": # 多边形
geo_points = geo["coordinates"][0]
elif geo["type"] == "MultiPolygon": # 多面
geo_points = geo["coordinates"][0][0]
else:
raise TypeError(
"Geometry type must be `Polygon` or `MultiPolygon`, not {}.".
format(geo["type"]))
xy_points = np.array([
_gt_convert(point[0], point[1], raster.geot) for point in geo_points
]).astype(np.int32)
# TODO: Label category
cv2.fillPoly(tmp_img, [xy_points], 1) # 多边形填充
ext = "." + geojson_path.split(".")[-1]
save_geotiff(tmp_img,
geojson_path.replace(ext, ".tif"), raster.proj, raster.geot)
os.remove(temp_geojson_path)
parser = argparse.ArgumentParser()
parser.add_argument("--raster_path", type=str, required=True, \
help="Path of original raster image.")
parser.add_argument("--geotiff_path", type=str, required=True, \
help="Path to store the geotiff file (the coordinate system is WGS84).")
if __name__ == "__main__":
args = parser.parse_args()
convert_data(args.raster_path, args.geotiff_path)