Horizontal coordinate systems are either geographic or projected. On the Layer Properties dialog box, click the Source tab and expand the Spatial Reference group. To see the coordinate system defined for your data source, or if your data source has a coordinate system defined, right-click the layer in the Contents pane and click Properties. Use the Project or Project Raster tool to project spatial data from one coordinate system to another.ДЇollow the steps in this topic to specify a coordinate system, or create a coordinate system. It is better to ensure that all the data is in the same coordinate system. Be aware, however, that projecting in real time can take longer to draw and is not advisable if you are editing data or performing analysis. If the map or scene's geographic coordinate system is different than the geographic coordinate system of the layer, the data is projected in real time using a transformation. When you add more layers to a map or scene, they are automatically displayed using the same coordinate system of the map or scene. You can, optionally, define a vertical coordinate system for a map or scene.Д®mpty maps and scenes derive their coordinate systems from the first layer added to them. A map or scene always has a horizontal coordinate system.

There are numerous coordinate systems to choose from for maps and local scenes, but the horizontal coordinate system for a global scene is limited to either WGS84 or China Geodetic Coordinate System 2000 (CGCS 2000). For global scenes, the default horizontal coordinate system is WGS84. In a new, empty map or local scene, the default horizontal coordinate system is WGS84 Web Mercator. Coordinate systems can be defined in both maps and scenes. Coordinate systems can be horizontal, defining where features are across the globe, or vertical, defining how high or deep features are relative to a surface. A coordinate system is a reference framework that defines the position of features in either two- or three-dimensional space. Maps and scenes use coordinate systems to locate and display data correctly on the earth's surface and relative to one another. Allow panning across the international date line in maps.Save a coordinate system as a projection file.Specify the coordinate systems of maps and scenes.

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