struct metrics
{
   double ew_res,ns_res,diag_res;
};

void filldir (int, int, int, struct band3 *, struct metrics *);
void resolve (int, int, struct band3 *);
int dopolys (int, int, int, int);
void wtrshed (int, int, int, int, int);
void ppupdate (int, int, int, int, struct band3 *, struct band3 *);