For states that extend in E-W direction, what map projection should we use? 9. For states that extend in N-S direction, what map projection should we use? 10. What map projection is used in state of California? Solution 8 . states that are elongate from east to west , such as New York, use a transverse Mercator projection 9. states that are elongate from north to south , such as California, use a Lambert conformal projection 10. In California, use a Lambert conformal projection (note: Lambert is the name of the cartographer who designed the projection, the projection itself is a conformal conic projection). .