X coordinate of T-points projection_x_coordinate meter Y coordinate of T-points projection_y_coordinate meter X coordinate of U-points projection_x_coordinate meter Y coordinate of U-points projection_y_coordinate meter longitude of T-points longitude degrees_east latitude of T-points latitude degrees_north longitude of U-points longitude degrees_east latitude of U-points latitude degrees_north angle between xi axis and east angle_of_rotation_from_east_to_x degrees lon_u lat_u grid_mapping angle between xi axis and east angle_of_rotation_from_east_to_x degrees lon_t lat_t grid_mapping length of northern edge of T-cell meter pm, scalar length of eastern edge of T-cell meter pm, scalar width of T-cell through the middle meter pm, scalar height of T-cell through the middle meter pm, scalar width of U-cell through the middle meter pm, scalar height of U-cell through the middle meter pm, scalar