Use the Select Coordinate System dialog to choose a pre-defined coordinate system, to define a new coordinate system, to customize an existing coordinate system, or to copy a coordinate system string to the clipboard. In the Edit Coordinate System dialog, click Select to choose a geographic coordinate system. Then choose a projected coordinate system Type and Units from the drop-down lists provided. Enter a Name for the new coordinate system. Welcome to the Harris Geospatial product documentation center. Here you will find reference guides, help documents, and product libraries. Use the Select Coordinate System dialog to choose a pre-defined coordinate system, to define a new coordinate system, to customize an existing coordinate system, or to copy a coordinate system string to the clipboard. The Selected Coordinate System table is populated with the coordinate system information from the input dataset. To choose a different coordinate system, click to expand the lists of field to search for a given coordinate system), then select the specific coordinate system. Its properties display in the Selected Coordinate System table. button. The Edit Coordinate System dialog appears. Here, you will define the details of a projected coordinate system, which includes properties of a geographic coordinate system plus a map projection type, projection parameters, and projection units. button. The Edit Coordinate System dialog appears with the projection details populated. Modify the geographic coordinate system and projected coordinate systems as needed. Click in the The edits only apply during the active session and are not permanently saved. To save your edits, add the edited coordinate system as a favorite (described in the next step). button. The coordinate system is added to the ‘Favorite Geographic’ or ‘Favorite Projected’ folder in the Select Coordinate System dialog. You can also select custom coordinate systems as favorites, and favorites can have duplicate names. To remove a coordinate system from either folder, select its name and click the Each coordinate system is represented by a text string that describes its properties for use with ENVI programming and header files. See This information is not subject to the controls of the International Traffic in Arms Regulations (ITAR) or the Export Administration Regulations (EAR). However, it may be restricted from transfer to various embargoed countries under U.S. laws and regulations. Source.