Types for Spatial Operations
============================
The following types are used for spatial operation functions within GlobalMapper. These types use fixed, numeric constants, which are defined here.


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_PredicateResultTargets_t8

    Result targets for predicate results



    :values:

        **GM_PredicateResult_CreateNewSelection** = 0
            Create new selection from matched features

        **GM_PredicateResult_AddToSelection** = 1
            Add matched features to current selection

        **GM_PredicateResult_RemoveFromSelection** = 2
            Remove matched features from current selection

        **GM_PredicateResult_CreateNewLayer** = 3
            Clone matched features into a new layer

        **GM_PredicateResult_ReturnFeatures** = 4
            Return matched via GM_FoundFeatureResults_t*


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_SpatialOperations_t8

    Spatial operation types



    :values:

        **GM_SpatialOps_Intersection** = 0
            Returns the spatial intersection of two layers

        **GM_SpatialOps_Union** = 1
            Returns the the spatial union of two layers, or among features of a single layer

        **GM_SpatialOps_Difference** = 2
            Returns the the spatial difference between two layers

        **GM_SpatialOps_SymmetricDifference** = 3
            Returns the the spatial symmetric difference between two layers


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_SpatialOps_Errorhandling_t8

    Flags specifying how to handle invalid input geometries



    :values:

        **GM_SpatialOps_OnErrorHalt** = 0
            Halt further processing

        **GM_SpatialOps_OnErrorSkip** = 1
            Skip invalid geometries

        **GM_SpatialOps_OnErrorIgnore** = 2
            Use invalid geometries anyway


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_SpatialPredicates_t16

    Spatial predicate types



    :values:

        **GM_SpatialPredicates_Intersects** = 1
            Calculates the set of features that intersect features in another layer

        **GM_SpatialPredicates_Overlaps** = 2
            Calculates the set of features that overlap features in another layer

        **GM_SpatialPredicates_Touches** = 4
            Calculates the set of features that touch features in another layer

        **GM_SpatialPredicates_Contains** = 8
            Calculates the set of features that wholly contain features in another layer

        **GM_SpatialPredicates_IsEqual** = 16
            Calculates the set of features that have have an exact match with the geometry of a feature in another layer

        **GM_SpatialPredicates_IsWithin** = 32
            Calculates the set of features that are wholly contained by a feature in another layer

        **GM_SpatialPredicates_IsDisjoint** = 64
            Calculates the set of features that do not intersect features in another layer


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_SpatialTransforms_t16

    Spatial transform types



    :values:

        **GM_SpatialTransform_MBR** = 1
            Returns a bounding rectangle area feature for each grouping of a given layer

        **GM_SpatialTransform_Center** = 2
            Returns a center point feature for each grouping of a given layer

        **GM_SpatialTransform_ConvexHull** = 3
            Returns a convex hull area feature for each grouping of a given layer

        **GM_SpatialTransform_ConcaveHull** = 4
            Returns a concave hull area feature for each grouping of a given layer

        **GM_SpatialTransform_Buffer** = 5
            Returns a buffer area feature at a given distance from each grouping of a given layer


------------------------------------------------------------------------------------------------------------------------

.. py:data:: globalmapper.GM_FeatureGrouping_t8

    Feature grouping for spatial transforms



    :values:

        **GM_GroupingNone** = 0x0001
            No grouping; features are handled individually

        **GM_GroupingPartition** = 0x0002
            Group features by attribute matching

        **GM_GroupingAll** = 0x0004
            Include all features in a single group