ArcMap 10.1、数字高程提取数字水系：[1]1
1、下载免费的dem数据
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/ab966c6b0ce265e7f3aa7ccc9f23beb9773eb739.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/cfa9ae04541bd10f2583152eba0e1799e82aa739.jpg)
3、打开Arctool Box
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/6bbfdd14f1c595eea364af9327530688902c9a39.jpg)
4、Asscii to Raster
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/994f412043715fdbc685a18e468920c5270f8c39.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/3931cb413a8ca6085baa8c48db8c9bcec6f8fe39.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/b7b28f87031c99c0be5af932af2fa872951fed39.jpg)
6、设置Layers的坐标
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/6061b9cd0c6efbf220156d63127bbbf4db58da39.jpg)
7、创建mask
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/0fb94656d53da824eb4fd466306651598440cb39.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/c33acc828689a146ff17f64df4bd4c7c35b3343e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/23fd63c5cf672b5f82e01d223314f4d0b403273e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/340e4eb8b43ea8db31ece286189c2cf7deb2163e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/1f9feadca039131fbc4acb6de275f2c4ed990a3e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/1f03436b04d14929e42e21a763e5eceeacbc7e3e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/4759c1dae43b3b868b8757e3185653bbf920753e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/54a89daee8d7592a7449f8cc9f31dfb6336c673e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/3c42a5ea3e863048cbe5cf60c33104ebf7a7523e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/cca2552c56ee7b7f3ba864c16ef4fcf5ef0d413e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/40d2d0e8b004541b07a9ea92869a310e1699a63e.jpg)
![ArcMap 10.1、数字高程提取数字水系：[1]1](https://exp-picture.cdn.bcebos.com/dda98e4800fc77f774a84794c8715fdb3720903e.jpg)
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1、下载免费的dem数据
3、打开Arctool Box
4、Asscii to Raster
6、设置Layers的坐标
7、创建mask