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This document is archived and information here might be outdated. Recommended version. |
IDataSampling Interface (ArcObjects .NET 10.6 SDK)
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This document is archived and information here might be outdated. Recommended version. |
Provides access to members that control the data sampling properties of a renderer.
| Name | Description | |
|---|---|---|
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MaxSampleSize | Maximum sample size. |
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SamplingMethod | Data sampling method. |
| CoClasses and Classes | Description |
|---|---|
| ClassBreaksRenderer | A renderer that can be used to draw graduated color (choropleth) and graduated symbol maps. |
| LasPointElevationRenderer | LasDataset point renderer component. |
| TerrainPointAttributeRenderer | Terrain point renderer component. |
| TerrainPointElevationRenderer | Terrain point renderer component. |
| TinAspectRenderer | TIN aspect renderer component. |
| TinElevationRenderer | TIN elevation renderer component. |
| TinNodeElevationRenderer | TIN node elevation renderer component. |
| TinSlopeRenderer | TIN slope renderer component. |
Use this interface to classify data for symbolization based on a subset of features instead of by considering all feature values. More specically, use this interface to specify the maximum number of features to consider when generating class breaks from a classification object.
To perform data sampling using this interface, first instantiate a renderer and set IDataSampling::MaxSampleSize. Next, pass this renderer to a TableHistogram or BasicTableHistogram using ITableHistogram::Sampling. Use IHistogram::GetHistogram to generate a list pair of values and frequencies. Then, classify your data using IClassifyGEN::Classify, passing these lists as parameters. Finally, take the class breaks that were generated by this operation and assign them to your renderer. For example, if working with a ClassBreaksRenderer, set your breaks using IClassBreaksRenderer::Break.
You can also use this interface to check to see if data sampling was used to generate the class breaks for an existing renderer. This works only if the renderer has been assigned by using the standard ArcMap user interface.