protected SpatialAnalysisExpression(GeometryExpression expressionLeft, SpatialAnalysisOperation operation,
                                     Expression expressionRight)
 {
     _leftExpression  = expressionLeft;
     _rightExpression = expressionRight;
     _operation       = operation;
 }
 public SpatialAnalysisGeometricExpression(GeometryExpression expressionLeft, SpatialAnalysisOperation operation, GeometryExpression expressionRight)
     : base(expressionLeft, operation, expressionRight)
 {
 }