Map data into regular use in the course of their work to other formats shp file for ArcGIS. However, the converted data is not with projection information, so it needs to convert their own projection, for example, be converted into the projector from an unknown format WGS84 latitude and longitude coordinate system. The following are general steps (the assumed here unknown coordinate system the data the original projection xian80): To open ArcCatalog Explorer, click on the layer you need to convert, right - properties, view the coordinate system is as follows At its coordinate system is empty. Next projection transformation. Open the ArcToolbox ->, Data Management Tools ->, Projections and Transformations ->, Create Custom Geographic Transformation open as follows: Click OK to complete creation, is successfully created, open the ArcToolbox ->, Data Management Tools ->, Projections and Transformations ->, Feature ->, Project Open, followed by fill out the content All content, fill it out, click OK, the conversion, the conversion result is as follows: Source.