多环缓冲区
=====================

1.描述
------------

在输入要素周围的指定距离内创建多个缓冲区。使用缓冲距离值可随意合并和融合这些缓冲区，以便创建非重叠缓冲区

2.使用限制
----------------

3.算子id
----------------
igis.gis.analysis.proximity.multipleRingBuffer

4.参数列表
------------------------------


+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
| 参数类型 | 参数名称              | 参数关键字                                 | 必要性 | 参数说明                                                                                                                                                                     | 数据类型 |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
| 输入参数 | url                   | 数据源地址                                 | Y      | 数据源地址                                                                                                                                                                   | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Input_Features        | 待缓冲要素                                 | Y      | 要进行缓冲的输入点、线或面要素                                                                                                                                               | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Distances             | 缓冲距离列表                               | Y      | 缓冲距离列表                                                                                                                                                                 | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Buffer_Unit           | 将要进行缓冲的输入要素的端头               | N      | 与距离值一起使用的线性单位。如果未指定单位，或者输入了默认，则将使用输入要素空间参考的线性单位。如果将缓冲区单位指定为默认并设置了输出坐标系地理处理环境，则将使用其线性单位 | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Field_Name            | 输出字段                                   | N      | 输出要素类中的字段名称，其中存储用于创建每个缓冲区要素的缓冲距离。如果未指定名称，则默认字段名称为distance。此字段类型为双精度。                                             | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Dissolve_Option       | 确定是否要像围绕输入要素的环一样融合缓冲区 | N      | 确定是否要像围绕输入要素的环一样融合缓冲区                                                                                                                                   | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
|          | Outside_Polygons_Only | 是否叠加                                   | N      | 仅对面输入要素有效                                                                                                                                                           | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+
| 输出参数 | Output_Feature_class  | 结果图层                                   | Y      | 含有多个缓冲区的输出要素类                                                                                                                                                   | String   |
+----------+-----------------------+--------------------------------------------+--------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------+


5.配置面板
--------------------

.. image:: ../../../_static/images/multipleRingBuffer_panel.jpg
   :width: 300px

6.调用示例
------------------
.. code::
    
    {
      "params": {
        "url":"kudu://172.20.20.15:7051/geomesa_spark",
        "Input_Features":"hainan",
        "Output_Feature_class":"hainan_multipleRingBuffer",
        "Distances":"0.1,0.2,0.3",
        "Buffer_Unit":"Feet",
        "Field_Name":"distance",
        "Dissolve_Option":"ALL",
        "Outside_Polygons_Only":"FULL"
      },
      "identifier":"igis.gis.analysis.proximity.multipleRingBuffer"
    }