# Transform
<a name="API_Transform"></a>

Contains an asset transform property. A transform is a one-to-one mapping of a property's data points from one form to another. For example, you can use a transform to convert a Celsius data stream to Fahrenheit by applying the transformation expression to each data point of the Celsius stream. A transform can only have a data type of `DOUBLE` and consume properties with data types of `INTEGER` or `DOUBLE`.

For more information, see [Transforms](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/asset-properties.html#transforms) in the * Amazon IoT SiteWise User Guide*.

## Contents
<a name="API_Transform_Contents"></a>

 ** expression **   <a name="iotsitewise-Type-Transform-expression"></a>
The mathematical expression that defines the transformation function. You can specify up to 10 variables per expression. You can specify up to 10 functions per expression.   
For more information, see [Quotas](https://docs.amazonaws.cn/iot-sitewise/latest/userguide/quotas.html) in the * Amazon IoT SiteWise User Guide*.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Required: Yes

 ** variables **   <a name="iotsitewise-Type-Transform-variables"></a>
The list of variables used in the expression.  
Type: Array of [ExpressionVariable](API_ExpressionVariable.md) objects  
Required: Yes

 ** processingConfig **   <a name="iotsitewise-Type-Transform-processingConfig"></a>
The processing configuration for the given transform property. You can configure transforms to be kept at the edge or forwarded to the Amazon Cloud. You can also configure transforms to be computed at the edge or in the cloud.  
Type: [TransformProcessingConfig](API_TransformProcessingConfig.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific Amazon SDKs, see the following:
+  [Amazon SDK for C\$1\$1](https://docs.amazonaws.cn/goto/SdkForCpp/iotsitewise-2019-12-02/Transform) 
+  [Amazon SDK for Java V2](https://docs.amazonaws.cn/goto/SdkForJavaV2/iotsitewise-2019-12-02/Transform) 
+  [Amazon SDK for Ruby V3](https://docs.amazonaws.cn/goto/SdkForRubyV3/iotsitewise-2019-12-02/Transform)