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outputVariable
Required element defining the identifier of the output time series with output values. This Id must reference a valid output time series.

minimumValue

Optional element defining the minimum value of the output time series. If the output value is lower than the configured minimum value the output value will be equal to the configured minimum value.

maximumValue

Optional element defining the maximum value of the input time series. If the output value is higher than the configured maximum value the output value will be equal to the configured maximum value. 

searchRadius

Required element defining the maximum radius in which the transformation searches the closest location/grid cell. The unit is meters. But please note, before 2012.02 it was by accident in kilometers for WGS84.

distanceGeoDatum

Geo datum used to calculate the distances in meters between the points. To calculate distances efficiently and to pre-sort the input points in a grid the earth's curved surface should be transformed to a flat two-dimensional surface. When the input geometry is not in meters calculation of distances will be very slow and a search all is required when there is no exact match. When there is no region/country specific coordinate system available choose a utm zone that best fits with your output region. http://en.wikipedia.org/wiki/File:Utm-zones.jpg. eg. UTM55S for Victoria state in Australia. Only use zone number and N for northern hemisphere and S for southern hemisphere.

InverseDistancePower

Required element to define the InverseDistanceOptionPower to which the inverse distance will be raised to calculate the weight factor of the input location/grid cell

numberOfpoints

Required elemet to defie the maximum number of points/grid cells which will be used to calculate the output.

Example 

<transformation id="Polygon2Grid">  
  
<interpolationSpatial>
              
	<containingPolygon>


		<inputVariable>
			<variableId>input_polygon</variableId>
    	</inputVariable>
		<outputVariable>
       	 	<variableId>output_grid</variableId>
		</outputVariable>
                                  
	</containingPolygon>
                       
</interpolationSpatial>
           
</transformation>

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