Define projection tool gis

The following Python Window script demonstrates how to use the DefineProjection function in immediate mode. The following stand-alone script uses the DefineProjection function to record coordinate system information for the input dataset. Feedback on this topic? Back to Top. Summary Overwrites the coordinate system information map projection and datum stored with a dataset.

Usage This tool only updates the existing coordinate system information—it does not modify any geometry. Code sample DefineProjection example Python window The following Python Window script demonstrates how to use the DefineProjection function in immediate mode.

All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. If the coordinate system for a dataset is unknown or incorrect, you can use this tool to specify the correct coordinate system.

You must know the correct coordinate system of the dataset before using this tool. This tool only updates the existing coordinate system information—it does not modify any geometry. If you want to transform the geometry to another coordinate system, use the Project tool. The most common use for this tool is to assign a known coordinate system to a dataset with an unknown coordinate system that is, the coordinate system is "Unknown" in the dataset properties.

This tool is intended for datasets that have an unknown or incorrect coordinate system defined. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data.

If the coordinate system for a dataset is unknown or incorrect, you can use this tool to specify the correct coordinate system. You must know the correct coordinate system of the dataset before using this tool. This tool only updates the existing coordinate system information—it does not modify any geometry.

If you want to transform the geometry to another coordinate system, use the Project tool. This tool is intended for datasets that have an unknown or incorrect coordinate system defined. All geographic datasets have a coordinate system that is used throughout ArcGIS to display, measure, and transform geographic data. If the coordinate system for a dataset is unknown or incorrect, you can use this tool to specify the correct coordinate system.

You must know the correct coordinate system of the dataset before using this tool. This tool only updates the existing coordinate system information—it does not modify any geometry.

If you want to transform the geometry to another coordinate system, use the Project tool.