SpatialDissolve
===============

.. currentmodule:: globalmapper
.. py:function:: SpatialDissolve (GM_LayerHandle_t32 aLayer, GM_SpatialOps_Params_t aParams, float aSmoothing, GM_FeatureGrouping_t8 aGrouping, str aStr) -> GM_Error_t32

	The **Dissolve** spatial transform creates a new layer with a polygon that combines all overlapping or touching areas from
	*aLayer* into one new area. For example, if you dissolved a layer showing the US state borders, the resulting
	polygon would be the US national border.

	The *aGrouping* parameter specifies whether all areas should be dissolved together, or just areas of equal
	attributes.

	:param GM_LayerHandle_t32 aLayer: Input layer
	:param GM_SpatialOps_Params_t aParams: Parameters
	:param GM_FeatureGrouping_t8 aGrouping: Grouping type
	:param str aStr: The attribute list string; may be an empty string
	:returns: Error Code
	:rtype: GM_Error_t32

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.. list-table::
    :width: 100%
    :class: borderless
    :header-rows: 1

    * - BEFORE
      - AFTER

    * - .. image:: ../images/SpatialAnalysis_Images/Red_Blue_Circles.png
            :width: 230px
            :height: 150px
            :align: center

      - .. image:: ../images/SpatialAnalysis_Images/DissolveAfter.png
            :width: 247px
            :height: 150px
            :align: center

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Example
-------
The following is an example of SpatialDissolve.

.. literalinclude:: ../../sample_tests/sample_code/SpatialDissolve_sample.py
   :language: python