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ArcGIS中对面状河流进行等距分段【渐变赋色、污染物扩散】
2022-06-29 12:08:00 【Gisleung】
GIS应用中,较细的河流被抽象成线,宽的河流则用面要素来表达。然而在一些业务场景中,需要对河流分段研究,并进行可视化的表达,因此有必要先对原始河流矢量数据做处理:
原始河流数据
1 提取中心线
1.1 矢量转栅格
转换工具—转为栅格—要素转栅格
重分类
符号化
新建线要素,开启编辑模式,”自定义—工具条—ArcScan“开启ArcScan

1.2 提取中心线
跳过矢量化设置,选择合适的参数,然后生成要素,目标选择新建的线要素

1.3 删除中心线中多余的要素,并合并为一整条线

2 等距离分割中心线
选中线要素,打开”编辑器—分割“,按需分割
3 线转点

对点按顺序编号(以备不时之需)
star= 0
def num():
global star
star+=1
return star

4 泰森多边形
”分析工具—领域分析—创建泰森多边形“
5 提取河流分段
5.1 使用河流矢量面裁剪泰森多边形
”分析工具—提取分析—裁剪“
5.2 从分割点中提取编号
”分析工具—叠加分析—空间连接“
6 应用
渐变颜色
河道污染物扩散
https://baijiahao.baidu.com/s?id=1688687276479778308&wfr=spider&for=pc
2 等距分割线
https://blog.csdn.net/soderayer/article/details/121597741
3 线转点,并按顺序编号
https://jingyan.baidu.com/article/fc07f9899362eb12ffe519f0.html
4 泰森多边形
5 泰森多边形联合初始河流面,创建新面
6 删除多余面,空间链接赋予编号order_
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