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Shunfeng Zheng
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Delete 坐标可视.py
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坐标可视.py
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import streamlit as st
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import folium
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from streamlit_folium import folium_static
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import json
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def extract_coordinates(coords):
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"""
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只提取前两个数值(经度、纬度),并返回格式化后的坐标列表
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兼容输入可能是 [(lon, lat, ...), (lon, lat, ...)]
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"""
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filtered_coords = []
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for coord in coords:
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if isinstance(coord, (list, tuple)) and len(coord) >= 2:
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filtered_coords.append([float(coord[0]), float(coord[1])]) # 只取前两个数值(经度、纬度)
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return filtered_coords
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def draw_polygon(coords):
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""" 在 Streamlit 页面上显示地图,并绘制输入的多边形 """
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filtered_coords = extract_coordinates(coords)
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if not filtered_coords:
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st.error("无法解析有效的坐标点,请检查输入格式!")
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return
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# 计算中心点(取第一个点作为地图中心)
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centroid = filtered_coords[0]
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# 创建地图
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my_map = folium.Map(location=[centroid[1], centroid[0]], zoom_start=12)
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# 添加多边形
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folium.Polygon(
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locations=[(lat, lon) for lon, lat in filtered_coords], # Folium 坐标格式 (纬度, 经度)
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color="blue",
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fill=True,
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fill_color="green",
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fill_opacity=0.3,
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weight=2
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).add_to(my_map)
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# 显示地图
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folium_static(my_map)
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# Streamlit 主函数
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def main():
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st.title("多边形地图可视化(支持列表和元组格式)")
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# 默认示例(同时包含列表和元组)
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default_input = '''[
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(151.0214153323324, -33.896092570872, 173.6675068465629),
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[151.022519, -33.897120, 172.53421],
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(151.023621, -33.898150, 170.49214),
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(151.0214153323324, -33.896092570872, 173.6675068465629)
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]'''
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# 用户输入坐标集
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coord_input = st.text_area("请输入坐标集(JSON 格式)", default_input)
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# 创建按钮
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if st.button("显示地图"):
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try:
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# 解析用户输入的 JSON 格式坐标
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coords = json.loads(coord_input.replace("(", "[").replace(")", "]")) # 兼容 ( ) 格式
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if isinstance(coords, list) and all(
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isinstance(coord, (list, tuple)) and len(coord) >= 2 for coord in coords):
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draw_polygon(coords)
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else:
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st.error("请输入正确格式的坐标集,例如:[(经度, 纬度, 可选值), ...] 或 [[经度, 纬度, 可选值], ...]")
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except json.JSONDecodeError:
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st.error("请输入有效的 JSON 格式数据!")
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if __name__ == "__main__":
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main()
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