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Used to set the buffer projection system.
| Constant | Value | Description | 
|---|---|---|
| esriMapSpatialReference | 0 | Indicating the use of the map's spatial reference system for an operation. | 
| esriFeatureClassSpatialReference | 1 | Indicating the use of the feature class's spatial reference system for an operation. | 
| esriFeatureOptimizedSpatialReference | 2 | Indicating the use of a feature optimized spatial reference system for an operation. | 
| esriFeatureSetOptimizedSpatialReference | 3 | Indicating the use of a feature set optimized spatial reference system for an operation. | 
| esriOtherSpatialReference | 4 | Indicating the use of a specific spatial reference system for an operation. |