It is theoretically possible to store data this way in ARC/INFO also, but analysis cannot be done unless the data is projected, and duplicated, in a better projection. This is impractical. Also, no GIS can yet store or process raster data in Long/Lat. Therefore, a true projection must be chosen for generation and storage of raster data. Once this is done, it is more convenient if all data (including vector) is stored in the same projection. A polygon coverage of the entire province was created, composed of rectangular areas (The 1:20,000 BCGS mapsheet neatlines) in longitude/latitude. This coverage was projected into UTM, Lambert, Polyconic, and Albers. The areas, latitudinal (horizontal) widths, and longitudinal (vertical) heights of the polygons in each projection were calculated. These measurements in each of the three projections were then compared with the corresponding measurements in UTM. Source.