行政区边线绘制+网格化+网页打开显示空白问题解决

一、行政区边线绘制

        步骤：1、获取行政区边线点的经纬度数据，越多越精确。2、python调用folium模块进行绘制

1、获取行政区边线点的经纬度数据

（1）网页搜索“高德地图API”，进入官网（高德开放平台 | 高德地图API (amap.com)），找到网页上方开发支持，点击web服务API，进入后在网页左侧找到“行政区域查询”并点击进入。

网页界面如下

将网页拉至最下面找到“服务示例”，在参数keywords的值中输入要绘制的行政区名称如历城区。在参数extensions的值中输入值“all”。点击运行。

点击运行结果中“districts”左边的加号，再点击“0”左边的加号，所显示的结果中，“polyline”后对应的数据即为所查找区域边界点的经纬度坐标。

注：若不确定所查找的区域是否在全国范围内有重名的，可以百度查找所要查找区域的"citycode"，济南市历城区的"citycode"为0531，与查找结果一致。若有重名，点击“districts”的加号后出现的不止有“0”，需自行对应"citycode"值找到要找的结果。

（2）数据处理

 python中定义一个变量a，将上述结果双引号中的所有值以字符串形式赋予a

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