This can be thought of as a preprocessing step to make it easier for software to join quadrangles. The simplest example of repackaging is to join a number of quadrangles with the software techniques described above and then save the result as a new data file. For state-sized areas, it is doubtful that such files can even be created. In this way, physical files can correspond exactly to a selected plane ground coordinate system. There is no such thing as a perfect projection.
All map projections represent tradeoffs between different types of distortion.
Selecting a projection requires consideration of several factors, one of which is the intended use of the map. Printed paper maps and digital data files are not used for exactly the same things. In particular, digital data can be reprojected inexpensively. Digital data are more likely to be used to construct mosaics of very large areas. Each of these options had advantages and disadvantages.