Arcgis应用（十三）根据图层字段属性值对图斑进行融合

Posted 2021-12-06 空中旋转篮球

1.数据和目标

使用数据：湖北省行政区数据 ；

实现目标：根据图层张的CITY字段（地级市编码）属性对地级市中更小一级区划进行合并。

使用工具：Arcgis中的Arctoolbox；

2.实现方法

（1）打开Arcgis中的arctoolbox

（2）依次打开工具箱Data Management Tools->Generalzation->Dissolve

 

(3)设置图层和参数

Dissolve_Field(s):融合依据字段；

Statistics Field(s):统计字段，比如这里选择面积字段，可以统计多项属性，比如总和、最大值、最小值和平均值等。

• FIRST—Finds the first record in the Input Features and uses its specified field value.
• LAST—Finds the last record in the Input Features and uses its specified field value.
• SUM—Adds the total value for the specified field.
• MEAN—Calculates the average for the specified field.
• MIN—Finds the smallest value for all records of the specified field.
• MAX—Finds the largest value for all records of the specified field.
• RANGE—Finds the range of values (MAX–MIN) for the specified field.
• STD—Finds the standard deviation on values in the specified field.
• COUNT—Finds the number of values included in statistical calculations. This counts each value except null values. To determine the number of null values in a field, use the COUNT statistic on the field in question, and a COUNT statistic on a different field which does not contain nulls (for example, the OID if present), then subtract the two values.

Create Multipart Features(创建多部分要素，比如如果有多个相离的图斑也作为一个图斑）:

Specifies whether multipart features are allowed in the output feature class.

• Checked—Specifies multipart features are allowed. This is the default.（默认合并为多部分要素图斑）
• Unchecked—Specifies multipart features are not allowed. Instead of creating multipart features, individual features will be created for each part.

Unsplit lines (optional):（是否融合边线，默认融合（或溶解）到图斑中）

Controls how line features are dissolved.

• Unchecked—Lines are dissolved into a single feature. This is the default.
• Checked—Lines are only dissolved when two lines have an end vertex in common.

（4）输出结果

按照以上图中设置参数输出结果（对比图）如下：

（5）属性查看

属性表中自动添加了面积字段，但同时也丢失了大部分原有的字段。